4B Pan Global Set

Front 1

(4-071-2.04) The low installation cost of a gas turbine is:Due to cheap materials in the blades.Due to short fuel lines.Because no fuel pump is required.Because no electrical wiring is required.Because less auxiliary equipment is needed.

Back 1

Because less auxiliary equipment is needed.

Front 2

(4-071-3.01) An arrangement of a steam system and a gas turbine is commonly referred to as:A complex-cycle systemA cogeneration systemA once-through systemA 2-stage systemA high capacity system

Back 2

A cogeneration system

Front 3

(4-071-1.01) A gas turbine:Expands hot gases through the compressor.Output increases when using air of maximum density.Operates the best when the inlet air is hot.Output increases at higher altitude.Output increases when equipped with an air preheater.

Back 3

Output increases when using air of maximum density.

Front 4

(4-071-1.03) An essential auxiliary in a gas turbine installation is a/an:Air heaterGeneratorAir dehumidifierCooling water pumpStarting motor

Back 4

Starting motor

Front 5

(4-071-i.01) Early gas turbines were handicapped by:Metal not being able to withstand high-speed centrifugal forces.The inability to get enough air into the combustion chamber.Metals not standing the high temperatures involved.Their high operating speeds.Their inadequate power capability.

Back 5

Metals not standing the high temperatures involved.

Front 6

(4-071-4.01) A gas turbine must be rotated at _____ of its maximum speed before fuel is turned on.10% to 30%15% to 30%20% to 30%25% to 30%25% to 50%

Back 6

20% to 30%

Front 7

(4-071-3.03) The purpose of a regenerator is to:Re-circulate the exhaust gases back through the compressor.Improve the efficiency of the turbine.Increase the temperature in the combustion chamber.Decrease the temperature in the combustion chamber.Remove the exhaust gas impurities.

Back 7

Improve the efficiency of the turbine.

Front 8

(4-071-1.02) The combustion chamber of a gas turbine:Increases the pressure of the compressed air.Is located between the load turbine and the compression turbine.Burns fuel with excess air.Is water-cooled.Rotates at shaft speed.

Back 8

Burns fuel with excess air.

Front 9

(4-071-1.04) A two shaft gas turbine:Has the load turbine downstream from the compressor turbine.Uses the first turbine to drive the propeller of a turboprop engine.Is always an open cycle.Is always a closed cycle.Does not require a starting motor.

Back 9

Has the load turbine downstream from the compressor turbine.

Front 10

(4-071-2.01) Some of the characteristics that make the gas turbine a better choice over other prime movers are:Low power-to-weight ratioHigh thermal efficiencyRapid startup and loadingLow fuel consumption.Low NO

Back 10

Rapid startup and loading

Front 11

(4-071-1.05) The output power of a gas turbine depends uponMass of hot gas passing through the turbine per second.Temperature at the turbine inlet.Mass of the unit.Slippage between the turbine and compressor.Turbine exhaust temperature.

Back 11

Mass of hot gas passing through the turbine per second.

Front 12

(4-071-2.03) Gas turbines are ideal where:Noise is undesirable.Water is scarce.Industrial sites are small and in populated areas.Thermal pollution is of major concern.There is an abundance of qualified Power Engineers to operate them.

Back 12

Water is scarce

Front 13

(4-071-2.02) Many typical steam plant auxiliaries are eliminated with a gas turbine due to its:Small sizeHigh speedHigh power to weight ratioSimplicityLow oil consumption

Back 13

Simplicity

Front 14

(4-071-1.07) A closed cycle gas turbine:Does not need a combustion chamber.Must use a cooler before the regenerator.Will use the same working fluid over again.Is a self-starting type of gas turbine.Starts with the exhaust valve closed.

Back 14

Will use the same working fluid over again.

Front 15

(4-071-1.06) A gas turbine performs most effectively if the:Lubricating oil is of low viscosity.Cooling water temperature is kept low.Compressor inlet air temperature is high.Ambient air temperature is low.Load is added immediately after starting.

Back 15

Ambient air temperature is low.

Front 16

(4-071-1.08) A simple gas turbine is one without reheaters or:Starting motorsShaftsCompressorsCombustorsRegenerators

Back 16

Regenerators

Front 17

(4-071-3.02) Clean air flows into a gas turbine regenerator from:Before the compressor.After the combustion chamber.Between the turbine and combustion chamber.Between the turbine and atmosphere.Downstream of the compressor.

Back 17

Downstream of the compressor.

(the regenerator is placed in air flow after the compressor and before the combustion chamber)

Front 18

(4-072-3.03) Compression ignition engines:Need suction and discharge valves.Will compress air only on the compression stroke.Need a carburetor to mix the fuel with the air.Will compress air only on the power stroke.Require a spark timing device.

Back 18

Will compress air only on the compression stroke.

Front 19

(4-072-5.01) Compression tests should be taken at regular intervals on diesel engines to check for possible development of:Coolant leaksLow torqueFouled glow plugsOverheatingPiston blow by

Back 19

Piston blow by

Front 20

(4-072-2.05) A major difficulty encountered with a two-stroke cycle engine is:The high torque at low speeds.Maintenance of many moving parts.The difficulty in cold weather starting.The high speeds compared to an equivalent four-stroke engine.Exhausting the spent gases from the cylinder.

Back 20

Exhausting the spent gases from the cylinder.

Front 21

(4-070-1.01) The rate of heat transfer in any cooling tower system depends on the:Volume of water in contact with the air.Latent heat in the cooling water.Speed of the fans.Difference between the inlet water temperature and the inlet air wet bulb temperature.Difference between the discharge air humidity and the inlet air humidity.

Back 21

Difference between the inlet water temperature and the inlet air wet bulb temperature.

Front 22

(4-072-2.04) A two-cycle gasoline engine:Has more moving parts than a four cycle.Produces twice as much power as a four cycle.Must have two cylinders.Requires exhaust valves.Is of more simple construction than a four cycle.

Back 22

Is of more simple construction than a four cycle.

Front 23

(4-069-3.03) A turbine overspeed trip:Trips the turbine if it is overloaded.Is installed on all turbines.Can be adjusted according to the load demand.Is regulated by exhaust pressure.Disconnects the turbine load if the turbine overspeeds.

Back 23

Is installed on all turbines.

Front 24

(4-072-1.04) Internal combustion engines used to drive gas compression machinery and which burn natural gas operate on the _____ cycle.One strokeRotaryTwo strokeTwo or four strokeFour stroke

Back 24

Two or four stroke

Front 25

(4-068-1.02) Which of the following is a prime mover?An electric generatorA gas turbineA centrifugal pumpAn air compressorA boiler

Back 25

A gas turbine

Front 26

(4-072-3.01) Diesel engines require:A spark plug in each cylinderA carburetorA magnetoA fuel injectorA spark distributor

Back 26

A fuel injector

Front 27

(4-072-3.05) An injection nozzle is used to _____ the fuel in a diesel engine:CarburateScavengeIgniteAtomizeAspirate

Back 27

Atomize

Front 28

(4-069-1.01) In a reaction turbine the steam pressure _____ in passing through moving blades, as well as through stationary nozzles or blades.IncreasesDecreasesRemains constantAcceleratesFluctuates

Back 28

Decreases

Front 29

(4-072-1.03) The fuel for a diesel engine is:Light fuel oil.Vaporized by a carburetor.Mechanically atomized by high pressure.Atomized before the cylinder.Mixed with air in the intake manifold.

Back 29

Mechanically atomized by high pressure.

Front 30

(4-072-4.01) Four-stroke cycle engine valves are:Operated by camshafts.Operated by pressure differential.A number of ports in the cylinder wall.Often calledreedOpen whenever the piston travels upward.

Back 30

Operated by camshafts.

Front 31

(4-072-2.01) One complete movement of the piston in one direction through the cylinder requires _____ revolution(s) of the engine crankshaft:One-halfOneTwoFourEight

Back 31

1/2

Front 32

(4-070-1.02) High discharge water temperature from the cooling tower could be caused by:Low wet bulb air temperatureHigh wet bulb air temperatureLow dry bulb air temperatureFine water spray in the towerLow concentration of solids in the water

Back 32

High wet bulb air temperature

Front 33

(4-072-1.02) Diesel engine governing is accomplished by:Varying the load on the engine.Carburetion.Varying the fuel quantity delivered per power stroke.Modulating the volume of the atomizing air.Modulating the pressure of the atomizing air.

Back 33

Varying the fuel quantity delivered per power stroke.

Front 34

(4-072-2.03) An engine which develops one power stroke with every second rotation of the crankshaft is the:Two stroke diesel engineType that requires pre-mixed lube oil and fuelFour stroke natural gas engineV type engineExternal combustion engine

Back 34

Four stroke natural gas engine

Front 35

(4-072-5.04) Using a compressed air starting motor is a popular method of starting:A large stationary diesel engineA small two-stroke engineA gasoline engineAn aircraft engineA propane engine

Back 35

A large stationary diesel engine

Front 36

(4–070–5.02) Biological fouling in recirculating cooling water towers is caused by algae, _____ and bacteria growth.FloraFaunaMicro–organismsBiologicalFungi

Back 36

Fungi

Front 37

(4–070–5.03) Organic growths also called _____ can reduce the flow rates in heat exchanger tubes and channels.AlgaeSlimeFungiSporesSilt

Back 37

Slime

Front 38

(4–070–2.03) Excessive wind velocity in a natural draft, cooling tower may cause:Louvers to become brokenHigh water drift or lossesRotation reversal of the fanOver–cooling of the waterUnder–cooling of the water

Back 38

High water drift or losses

Front 39

(4–070–2.02) Natural draft cooling towers are divided into:Dry and wet typesClosed and semi closed typesAtmospheric towers and chimney towersFilled and unfilled typesOpen and filled types

Back 39

Atmospheric towers and chimney towers

Front 40

(4–070–2.01) Air flow in a natural draft cooling tower is dependent upon the:Speed of the cooling fan.Volume of water flowing through.Partial pressure exerted above the surface of the sump.Differences in the temperature of the air leaving and entering the cooling tower.Wind direction.

Back 40

Differences in the temperature of the air leaving and entering the cooling tower.

Front 41

(4–070–6.01) Your cooling tower fan motor is running hot and is noisy. After examining the motor, you discover that the bearings need replacement. The evidence you discovered was:The motor was running on a single phase.The motor windings were faulty.You heard a noise that sounded like a bad bearing.The rotor was rubbing the stator.The gear reducer pinion shaft was misaligned.

Back 41

The rotor was rubbing the stator.

Front 42

(4–070–3.02) With all other factors being equal, a counter–flow cooling tower _____________ as a cross–flow cooling tower.Is not as tallHas much less cooling capacityRequires less floor spaceRequires less fan powerHas a lower pressure drop

Back 42

Requires less floor space

Front 43

(4–070–4.01) A valve that bypasses water flow away from the fill of a cooling tower during cold weather should not be closed until the temperature reaches:–0.5°C+0.5°C+5°C+20°C+27°C

Back 43

+27°C

Front 44

(4–070–4.02) To prevent cooling tower basin water from freezing during cold weather, many units:Are equipped with ethylene glycol antifreeze systems.Are equipped with electric basin heaters.Are equipped with propane burners.Are equipped with ice defrosters.Have salt added to the water.

Back 44

Are equipped with electric basin heaters.

Front 45

(4–070–2.04) Natural draft cooling towers operate most effectively in large open spaces and:Where wind is relatively constant.Where relative humidity is high.Where a large body of water is nearby.Require a windbreak.Must not be in direct sunlight.

Back 45

Where wind is relatively constant.

Front 46

(4–070–5.04) The component of wood that is leached away reducing the ability of the wood to resist decay is the:BarkCreosoteLigninCelluloseNatural extractives

Back 46

Natural extractives

Front 47

(4–070–i.01) The average amount of water volume that evaporates from a cooling tower is:2%10%15%5%3.5%

Back 47

5%

Front 48

(4–070–3.01) Water contained in the air stream at the discharge of a cooling tower is removed:With centrifugal separatorsWith a desiccantUsing mechanical refrigerationBy a series of bafflesWith drift eliminators

Back 48

With drift eliminators

Front 49

(4–070–5.05) The principal cause of steel corrosion in cooling towers is:Dissolved carbon dioxideHigh pHDissolved oxygenLow pHDissolved hydrogen

Back 49

Dissolved oxygen

Front 50

(4–070–5.01) Scaling is not as severe in cooling towers when compared to boilers because:Cooling tower water does not evaporate.There are not as many dissolved solids in tower water.Pressure is not as high.Water temperatures are not as high in cooling towers.Cooling tower water is constantly being aerated.

Back 50

Water temperatures are not as high in cooling towers.

Front 51

(4–070–5.02) Biological fouling in recirculating cooling water towers is caused by algae, _____ and bacteria growth.FloraFaunaMicro–organismsBiologicalFungi

Back 51

Fungi

Front 52

(4–070–5.03) Organic growths also called _____ can reduce the flow rates in heat exchanger tubes and channels.AlgaeSlimeFungiSporesSilt

Back 52

Slime

Front 53

(4–070–2.03) Excessive wind velocity in a natural draft, cooling tower may cause:Louvers to become brokenHigh water drift or lossesRotation reversal of the fanOver–cooling of the waterUnder–cooling of the water

Back 53

High water drift or losses

Front 54

(4–070–2.02) Natural draft cooling towers are divided into:Dry and wet typesClosed and semi closed typesAtmospheric towers and chimney towersFilled and unfilled typesOpen and filled types

Back 54

Atmospheric towers and chimney towers

Front 55

(4–070–2.01) Air flow in a natural draft cooling tower is dependent upon the:Speed of the cooling fan.Volume of water flowing through.Partial pressure exerted above the surface of the sump.Differences in the temperature of the air leaving and entering the cooling tower.Wind direction.

Back 55

Differences in the temperature of the air leaving and entering the cooling tower.

Front 56

(4–070–6.01) Your cooling tower fan motor is running hot and is noisy. After examining the motor, you discover that the bearings need replacement. The evidence you discovered was:The motor was running on a single phase.The motor windings were faulty.You heard a noise that sounded like a bad bearing.The rotor was rubbing the stator.The gear reducer pinion shaft was misaligned.

Back 56

The rotor was rubbing the stator.

Front 57

(4–070–3.02) With all other factors being equal, a counter–flow cooling tower _____________ as a cross–flow cooling tower.Is not as tallHas much less cooling capacityRequires less floor spaceRequires less fan powerHas a lower pressure drop

Back 57

Requires less floor space

Front 58

(4–070–4.01) A valve that bypasses water flow away from the fill of a cooling tower during cold weather should not be closed until the temperature reaches:–0.5°C+0.5°C+5°C+20°C+27°C

Back 58

+27°C

Front 59

(4–070–4.02) To prevent cooling tower basin water from freezing during cold weather, many units:Are equipped with ethylene glycol antifreeze systems.Are equipped with electric basin heaters.Are equipped with propane burners.Are equipped with ice defrosters.Have salt added to the water.

Back 59

Are equipped with electric basin heaters.

Front 60

(4–070–2.04) Natural draft cooling towers operate most effectively in large open spaces and:Where wind is relatively constant.Where relative humidity is high.Where a large body of water is nearby.Require a windbreak.Must not be in direct sunlight.

Back 60

Where wind is relatively constant.

Front 61

(4–070–5.04) The component of wood that is leached away reducing the ability of the wood to resist decay is the:BarkCreosoteLigninCelluloseNatural extractives

Back 61

Natural extractives

Front 62

(4–070–i.01) The average amount of water volume that evaporates from a cooling tower is:2%10%15%5%3.5%

Back 62

5%

Front 63

(4–070–3.01) Water contained in the air stream at the discharge of a cooling tower is removed:With centrifugal separatorsWith a desiccantUsing mechanical refrigerationBy a series of bafflesWith drift eliminators

Back 63

With drift eliminators

Front 64

(4–070–5.05) The principal cause of steel corrosion in cooling towers is:Dissolved carbon dioxideHigh pHDissolved oxygenLow pHDissolved hydrogen

Back 64

Dissolved oxygen

Front 65

(4–070–5.01) Scaling is not as severe in cooling towers when compared to boilers because:Cooling tower water does not evaporate.There are not as many dissolved solids in tower water.Pressure is not as high.Water temperatures are not as high in cooling towers.Cooling tower water is constantly being aerated.

Back 65

Water temperatures are not as high in cooling towers.

Front 66

(4–069–1.10) The shrouding on the blades of a steam turbine serves to:Cools the blade tipsExpands the steamActs as a bearing surfaceHeats the steamConfines the steam to the blades

Back 66

Confines the steam to the blades

Front 67

(4–069–3.02) A steam turbine should trip or shut down when normal operating speed is exceeded by:250 RPM3 to 5%50 RPM10 to 15%25 RPM

Back 67

10 to 15%

Front 68

(4–069–5.02) The great majority of turbine governors are of the _____ type:MechanicalHydraulicMechanical centrifugalPneumaticInertia

Back 68

Mechanical centrifugal

Front 69

(4–069–1.05) The principle of an impulse turbine is that:Kinetic energy is converted to mechanical energy.A thrust force causes the rotating blades to move.The steam leaves the blades with high velocity.Steam exerts a high pressure on the nozzles.High velocity steam exerts force upon the rotating blades.

Back 69

High velocity steam exerts force upon the rotating blades.

Front 70

(4–069–2.01) Shaft sealing of small steam turbines is done with:O–ringsCompressed airCarbon ringsLabyrinth glandsMechanical seals

Back 70

Carbon rings ?

Front 71

(4–069–2.04) Shaft sealing carbon glands are:Lubricated by the main oil pumpLimited to a temperature of 250°CReplaced monthly due to erosionSelf–lubricatingSprayed with Monel

Back 71

Self–lubricating

Front 72

(4–069–1.02) The stationary passages of a reaction turbine are called the:ShaftRotorShroud ringFixed bladesDiaphragms

Back 72

Fixed blades

Front 73

(4–069–1.01) In a reaction turbine the steam pressure _____ in passing through moving blades, as well as through stationary nozzles or blades.IncreasesDecreasesRemains constantAcceleratesFluctuates

Back 73

Decreases

Front 74

(4–069–2.02) The shafts of high output, high temperature steam turbines are usually sealed by using:Compressed air sealsCarbon ringsPacking ringsOil sealed glandsLabyrinth glands

Back 74

Labyrinth glands

Front 75

(4–069–5.01) Steam turbine governors:Prevent the turbine from over speeding.Regulate the speed of the turbine automatically.Should be checked annually by the boiler inspector.Are driven by the generator shaft.Are not required for reaction turbines.

Back 75

Regulate the speed of the turbine automatically.

Front 76

(4–069–1.09) The feature of an impulse turbine that prevents a drop in pressure as the steam passes through the blades is?The shape of the steam passages between adjacent blades.The lower shaft speed.The back torque on the driver.The higher temperature of the inlet steam.The momentum of the load.

Back 76

The shape of the steam passages between adjacent blades.

Front 77

(4–069–2.06) Turbines often have segmental carbon ring sealing glands that are held in place by:Set screwsWoodruff keysDrive screwsSpringsThrust runners

Back 77

Springs

Front 78

(4–069–2.03) The purpose of turbine glands is to prevent:Water from entering the turbine.Steam from entering the turbine.Steam escaping from the turbine.Steam from entering the lubrication system.Oil from entering the turbine.

Back 78

Steam escaping from the turbine.

Front 79

(4–069–6.01) When starting a steam turbine it is customary practice to:Stop the auxiliary oil pump as soon as steam begins to turn the unit.Turn on all cooling water systems first.Place the speed control system in service once the unit is rolling.Test the overspeed trip as soon as running speed is attained.Analyze the oil for water prior to rolling.

Back 79

Turn on all cooling water systems first.

Front 80

(4–069–3.01) The turbine overspeed trip:Prevents the turbine exceeding the maximum rated speed.Prevents the turbine from vibrating.Prevents turbine bearing damage.Opens the sentinel valve.Alerts the operator of excessive turbine RPM.

Back 80

Prevents the turbine exceeding the maximum rated speed.

Front 81

(4–069–2.07) Steam turbine lubrication oil:Can be used to operate the turbine governor.Must be water soluble.Lubricates the dummy piston.Contaminates the condensate of condensing turbines.Lubricates the labyrinth gland.

Back 81

Can be used to operate the turbine governor.

Front 82

(4–069–1.11) Blades, also called _____, form the steam flow passages in impulse turbines.BucketsCylindersPortsPipesDiaphragms

Back 82

Buckets

Front 83

(4–069–1.07) Two of the more important methods of classifying a steam turbine are by the stationary steam passages and the:Casing passagesExhaust passagesRotor passagesInlet passagesOil passages

Back 83

Rotor passages

Front 84

(4–068–2.04) When possible, a wise and simple method of checking the bearings of operating equipment involves:
Checking the oil quality leaving each bearing.
Checking the oil quantity leaving each bearing.
Getting accustomed to normal operating temperature and vibration by feel.
Noticing the normal operating scent of each bearing.
Observing the bearing temperature on a thermometer.

Back 84

Getting accustomed to normal operating temperature and vibration by feel.

Front 85

(4–068–2.05) A steam engine piston:
Moves fastest at the end of its stroke.
Produces the most force at the end of its stroke.
is lubricated with crankcase oil by the splash method.
Moves fastest at the mid–point of its stroke.
Needs no lubrication.

Back 85

Moves fastest at the mid–point of its stroke.

Front 86

(4–068–2.08) The slide valve of a steam engine is designed to:
Allow the piston to slide more freely.
Drain the condensate from the cylinder during warm–up.
Provide lubrication for the steam engine.
Allow steam to enter and leave the cylinder.
Prevent the engine from over speeding.

Back 86

Allow steam to enter and leave the cylinder.

Front 87

(4–068–2.02) One of the first ways to detect a fault in a reciprocating steam engine is by:Monitoring changes in its sound.Observing temperature indication.Determining its performance efficiency.Monitoring its oil consumption.Monitoring changes in smell.

Back 87

Monitoring changes in its sound.

Front 88

(4–068–1.03) Despite their size and complexity, steam plants are widely used because:Of their low emissions of pollutants.They are easily located in an urban environment.They can be run by untrained personnel.They require minimal amounts of water.They can burn solid fuels such as coal and wood.

Back 88

They can burn solid fuels such as coal and wood.

Front 89

(4–068–2.09) A "heat engine" is an operating cycle that uses a fluid to convert:Thermal energy to chemical energyChemical energy to mechanical energyThermal energy to electrical energyMechanical energy to electrical energyThermal energy to mechanical energy

Back 89

Thermal energy to mechanical energy

Front 90

(4–068–1.04) The term "prime mover" refers to:All heat enginesA device that uses a source of energy to produce mechanical motionElectric motors onlySteam and gas turbines onlyThermal generating stations

Back 90

A device that uses a source of energy to produce mechanical motion

Front 91

(4–068–2.06) A routine inspection of an operating steam engine should start with:LubricatorsDrive beltsEngine speedSteam temperatureSteam quality

Back 91

Lubricators

Front 92

(4–068–2.03) A steam engine's crosshead:Imparts angular motion to the piston rod.Converts linear motion of the piston rod into angular motion.Imparts linear motion to the connecting rod.Does not require any lubrication.Is often called thegudgeon

Back 92

Converts linear motion of the piston rod into angular motion.

Front 93

(4–068–1.01) Large power production plants tend to be of the thermal type because they can burn solid fuels and:They are the least expensive to build.The noise level is much less than internal combustion engines.The heat cycle they use is the most efficient.Solid fuels are the most plentiful and the cheapest.They require the least amount of manpower.

Back 93

The heat cycle they use is the most efficient.

Front 94

(4–068–2.01) Connecting rods on a steam engine:Convert reciprocating motion to rotary motion.Are used to move the slide valve.Are only needed on vertical engines.Are used to connect the piston to the slide valve.Connects the inlet valve to the discharge valve.

Back 94

Convert reciprocating motion to rotary motion.

Front 95

(4–068–2.07) A steam engine will have the steam supply to the cylinder shut off once the piston has traveled _____ of its stroke.1/4 to 1/375% to 90%15% to 20%55% to 65%90% to 95%

Back 95

1/4 to 1/3

Front 96

(4-073-3.02) Rotary pumps should be started with the discharge valve open because they are _____ pumps.DiffuserReciprocatingDouble-actingPositive displacementRegenerative

Back 96

Positive displacement

Front 97

(4-073-2.08) Which type of pump produces the greatest suction?A variable displacement pumpA volute centrifugal pumpA centrifugal pumpA regenerative pumpA positive displacement pump

Back 97

A positive displacement pump

Front 98

(4-073-3.11) When starting up a rotary pump you must be sure that the:Discharge valve is closed.Discharge valve is open.Pump is filled with air.Pump is at the correct temperature.Pump suction valve is closed.

Back 98

Discharge valve is open.

Front 99

(4-073-3.12) A circulating pump is usually:Connected with some type of heat exchanger system.A once-through device.A reciprocating pump.A small capacity pump.A high head pump.

Back 99

Connected with some type of heat exchanger system.

Front 100

(4-073-3.09) A hot water heating system circulator should:Be directly coupled.Have its own vibration free base.Be quiet in operation.Develop an extremely high differential pressure.Not run continuously.

Back 100

Be quiet in operation.

Front 101

(4-073-2.05) The difference between static suction head and static discharge head is:Total static headStatic discharge headStatic suction headEquivalent headDynamic head

Back 101

Total static head

Front 102

(4-073-3.14) A centrifugal pump consists of:An impeller surrounded by a casing.A piston moving back and forth in a cylinder.Gears rotating in a housing.Sliding vanes.A pulsating disc.

Back 102

An impeller surrounded by a casing.

Front 103

(4-073-3.13) A double-acting pump:Has two pistons on the pump end.Is directly driven by the steam pistons.Has two pistons on the driver end.Has two slide valves.Is a positive displacement pump.

Back 103

Is a positive displacement pump.

Front 104

(4-073-3.03) Turbine pumps:Are positive displacement pumps.Add energy to the fluid being pumped, through a series of reaction forces.Are high-pressure pumps.Use diffusers to convert velocity into pressure.Are only single-stage pumps.

Back 104

Are high-pressure pumps.

Front 105

(4-073-2.09) Preferably, dynamic pumps should be located _____ the liquid source.Directly underAboveImmersed inAtBelow

Back 105

Below

Front 106

(4-073-3.17) A multi-stage pump would be used when:The lift is great.A greater volume must be pumped.The head is great.The temperature of the liquid is high.There is sufficient floor space.

Back 106

The head is great.

Front 107

(4-073-3.06) Centrifugal pumps convert rotating mechanical energy into kinetic energy then:Discharge the kinetic energy.Back to mechanical energy.Absorb the energy.Into potential energy in the form of pressure.Into centrifugal force.

Back 107

Into potential energy in the form of pressure.

Front 108

(4-073-3.05) When a reciprocating pump delivers fluid every second stroke of its piston, it is called a ___________ pump:Positive displacementSingle actingTwo-stageDouble actingDuplex

Back 108

Single acting

Front 109

(4-073-3.10) Centrifugal pump power requirements are decreased when:Discharge pressure is decreased.The mass of fluid delivered is decreased.The casing pressure drops.The discharge velocity is high.The discharge head is at minimum.

Back 109

The mass of fluid delivered is decreased.

Front 110

(4-073-3.08) The capacity of a centrifugal pump:Varies with discharge pressure.Is fixed and can only be altered by changing the impeller.Indicates that the unit is a positive displacement type.Should be varied by suction valve manipulation.Can be altered by speed variation only.

Back 110

Varies with discharge pressure.

Front 111

(4-073-2.04) Consider a pump that delivers liquid into the base of an overhead storage tank, from a reservoir situated below the pump. The vertical distance from the liquid surface up to the pump center line plus the vertical distance from the pump center line up to the surface of the liquid in the discharge tank is:Static discharge headStatic suction headSuction liftTotal discharge headTotal static head

Back 111

Total static head

Front 112

(4-073-2.01) Rotary pumps:Are low-pressure pumps.Must be primed before each use.Are positive displacement pumps.Must use mechanical seals.Have tight clearances on all moving parts.

Back 112

Are positive displacement pumps.

Front 113

(4-073-2.07) A pump is capable of suction lift due to:Its ability to convert kinetic energy into potential energy.The speed at which it operates.Its input power.Its size.Atmospheric pressure.

Back 113

Atmospheric pressure.

Front 114

(4-073-3.07) A volute type pump:Is a positive displacement pump.Has a progressively expanding spiral casing.Reduces the velocity in the discharge nozzle.Is more costly than diffuser pumps.Is a regenerative type pump.

Back 114

Has a progressively expanding spiral casing.

Front 115

(4-073-2.06) When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as:Dynamic headEquivalent headDischarge headFriction headTotal head

Back 115

Equivalent head

Front 116

(4-073-3.04) A diffuser pump:Does not have a voluteDoes not have to be primedHas high suction liftHas a higher efficiency than a volute typeIs double-acting

Back 116

Has a higher efficiency than a volute type

Front 117

(4-073-3.01) The name given to the category of pumps that use gear teeth, vanes, or lobes to move the fluid being pumped is the _____ type.ReciprocatingAxial flowRadial flowDynamicRotary

Back 117

Rotary

Front 118

(4-073-2.03) Centrifugal pumps do not develop good suction lift because:Atmospheric pressure is usually too low.The pumped medium relative density is too high.Their internal component clearances are too high.The speed is too low.They favour pressure rather than volume.

Back 118

Their internal component clearances are too high.

Front 119

(4-074-5.06) Before you start up a centrifugal pump you should:Blow off the liquid from the housing.Close the water to the lantern rings.Be sure that the pump is primed with liquid.Close the suction and discharge valves.Change the lube oil.

Back 119

Be sure that the pump is primed with liquid.

Front 120

(4-074-5.01) While a pump is operating, your inspection should include the following:Ensure water freely flows from the packing.Ensure water is dripping from the mechanical seals.Check the suction and discharge pressures.Make sure the shafts are in alignment.Prime the pump.

Back 120

Check the suction and discharge pressures.

Front 121

(4-074-2.11) If a stuffing box is to prevent the ingress of air, it is equipped with:A vacuum breakerA seal cageA bushingA thrust collarAn anti-air siphon

Back 121

A seal cage

Front 122

(4-074-1.02) Pump wear rings are installed on an impeller by set screws, threading, or:ShrinkingWeldingBrazingSolderingForging

Back 122

Shrinking

Front 123

(4-074-2.03) The purpose of shaft sealing on a pump is to:Keep air in the pump.Keep the packing gland cool.Reduce fluids from leaking along the pump shaft.Prevent lubricating oil from leaving the pump.Protect the seal.

Back 123

Reduce fluids from leaking along the pump shaft.

Front 124

(4-074-2.02) Lantern rings:Must be greased regularly.Prevent liquid leakage from the pump.Provide a seal to prevent air from entering the pump.Are mostly used on submerged centrifugal pumps.Keep the oil from leaking out of the pump bearings.

Back 124

Provide a seal to prevent air from entering the pump.

Front 125

(4-074-3.01) Mechanical seals:Allow the pump to be run dry.Are used where leakage is objectionable.Replace seal cages.Withstand shaft misalignment and vibration better than packing.Are less costly than packing.

Back 125

Are used where leakage is objectionable.

Front 126

(4-074-2.12) Another name for a lantern ring, used in a pump is:Packing boxPacking ringRotating sealSeal cageStationary seal

Back 126

Seal cage

Front 127

(4-074-4.02) Flexible couplings will compensate for:Overheating of packing.Minor shaft misalignment.Bearing failure.Shaft eccentricity due to a badly bent shaft.Impeller imbalance.

Back 127

Minor shaft misalignment.

Front 128

(4-074-2.04) The area around a pump shaft, where packing material is placed to reduce leakage past the shaft, is known as a:Seal boxStuffing boxSeal cageWearing ringGear box

Back 128

Stuffing box

Front 129

(4-074-5.05) Pump priming is:Done to centrifugal pumps with positive suction head.Done with the suction valve open.Filling the pump with gas.Done with the suction and discharge valve closed.When the pump is partially filled with vapour.

Back 129

Done with the suction valve open.

Front 130

(4-074-5.03) Most pump troubles occur:After about six months of continuous service.Due to vapour binding.During initial start-up.Due to wrong rotation.Because of inadequate operator training.

Back 130

During initial start-up.

Front 131

(4-074-4.01) Shaft misalignment during operation of a pump can be caused by bearing wear, thermal expansion and:Shaft flexingThrottling of the discharge valveOverloading the pumpLoss of lubricationImproper installation

Back 131

Shaft flexing

Front 132

(4-074-2.01) A slight leakage is desired between the pump shaft and the packing in order to:Prevent the ingress of air.Increase pump capacity and efficiency.Prevent wearing of the wear rings.Lubricate the shaft and packing.Prevent the pump from vapour locking.

Back 132

Lubricate the shaft and packing.

Front 133

(4-074-2.10) If the packing gland of a centrifugal water pump is leaking too much, you should:Tighten up the gland until all leakage has been stopped.Tighten up the gland but permit a slight amount of leakage.Tighten up the gland as far as is possible.Throttle the suction valve a little.Tighten up the gland until there is 10% leakage.

Back 133

Tighten up the gland but permit a slight amount of leakage.

Front 134

(4-074-5.04) Priming of a centrifugal pump refers to:Removal of liquid from the pump.Filling the pump casing with liquid and removing the air.Lifting the pump.Closing the vent on the pump casing.Starting the pump driver.

Back 134

Filling the pump casing with liquid and removing the air.

Front 135

(4-074-6.02) You discover that your feed water pump is not delivering sufficient water. A possible cause is:The wear rings are excessively worn.The suction lift is too low.The discharge head is not high enough.There is too much water in the pump.The foot valve is fully open.

Back 135

The wear rings are excessively worn.

Front 136

(4-074-1.01) Wear rings in centrifugal pumps:Are non-replaceable.Are installed on impellers.Protect the shaft from wear.Compensate for misalignment of the impeller.Are only found on high pressure pumps.

Back 136

Are installed on impellers.

Front 137

(4-074-5.07) Strainers may be found:On the suction side of the pump.On the discharge side of the pump.Inside the pump.On the air vent discharge of the pump.In the impeller eye of the pump.

Back 137

On the suction side of the pump.

Front 138

(4-074-1.03) Wear rings are usually constructed of:Ceramics or aluminumGraphite or bronzeBronze or cast ironSteel or alloy steelTeflon

Back 138

Bronze or cast iron

Front 139

(4-075-1.04) Which of the following air compressors gives two compression strokes per crankshaft revolution:Multistage two cylinder compressor.A two-stroke compressor.Single cylinder double acting compressor.A two-stage compressor.Single acting compressor.

Back 139

Single cylinder double acting compressor.

Front 140

(4-075-2.09) Intercoolers:Must have a drain.Are more efficient when cooled with air than with water.Are used on double acting single stage compressors.Help increase the volume of the air.Should use an antifreeze solution.

Back 140

Must have a drain.

Front 141

(4-075-1.02) In a centrifugal compressor the kinetic energy is converted to potential energy in the:Volute, diffuser or bothIntercoolerDiffuser onlyCompressor cavityVolute only

Back 141

Volute, diffuser or both

Front 142

(4-075-1.08) A reciprocating air compressor works on the principle of:Pressure reductionVelocity increaseCentrifugal forceVolumetric expansionVolume reduction

Back 142

Volume reduction

Front 143

(4-075-2.06) Compressor unloaders:Could close the discharge valve.Must be used on centrifugal compressors.Could keep the suction valve open.Activate the stop and start button.Are located on the driver of the compressor.

Back 143

Could keep the suction valve open.

Front 144

(4-075-2.03) In order to protect the drive motor, a start-stop air compressor should be equipped with:Variable speed controlConstant speed controlSafety headsA speed-sensitive automatic cylinder unloaderLiquid cooling

Back 144

A speed-sensitive automatic cylinder unloader

Front 145

(4-075-2.02) An air receiver used in an air compression system:Reduces the energy required to compress air.Eliminates pulsation in discharge lines.Provides a location to trap airborne dirt.Controls the temperature of the air before it enters the system.Eliminates moisture from the air.

Back 145

Eliminates pulsation in discharge lines.

Front 146

(4-075-1.05) A speed-increasing gear is commonly used on:Rotary lobe compressorsScrew compressorsSliding vane compressorsReciprocating compressorsLobe compressors

Back 146

Screw compressors

Front 147

(4-075-2.10) Air receivers must have a:Gauge glassThermometerHigh pressure alarmSafety valveHigh water alarm

Back 147

Safety valve

Front 148

(4-075-i.01) Compressed air tools tend to be:Heavier than equivalent electrical tools.Damaged by overloading.Hot after prolonged operation.More expensive than electrical tools.Less compact than electrical tools.

Back 148

More expensive than electrical tools.

Front 149

(4-075-2.01) An air compressor auxiliary which will decrease the power requirement is the:ReceiverDiffuserIntercoolerUnloaderAftercooler

Back 149

Intercooler

Front 150

(4-075-1.06) Single stage reciprocating air compressors have:One or more cylinders of equal sizeVariable speed driversSeveral cylinders, each of different sizesLow power requirementsIntercoolers

Back 150

One or more cylinders of equal size

Front 151

(4-075-3.01) The cooling water for an air compressor should be turned on:When the compressor reaches operating temperature.After starting the compressor.While the compressor is idling.When the operating pressure is reached.Before starting the compressor.

Back 151

Before starting the compressor.

Front 152

(4-075-2.07) To reduce air temperature between stages, we would use:An intercoolerAn aftercoolerA receiverA convertorA chiller

Back 152

An intercooler

Front 153

(4-075-1.07) Positive displacement compressors:Cannot deliver pulsation-free air.Cannot deliver oil-free air.Must have suction and discharge valves.Must all use internal lubrication.Could be single stage with three cylinders.

Back 153

Could be single stage with three cylinders.

Front 154

(4-075-2.05) An air compressor may be automatically started and stopped by a pressure switch, which is usually found connected to the:IntercoolerAftercoolerSeparatorReceiverControl panel

Back 154

Receiver

Front 155

(4-075-1.09) Centrifugal compressors:Are used for high pressure and low flow.Could be of the multi-stage type.Must have intercoolers when multi-staged.Must have a safety valve on the discharge when steam driven.Require inlet and discharge valves.

Back 155

Could be of the multi-stage type.

Front 156

(4-075-1.03) Sliding vane compressors:Are double acting compressors.Use suction and discharge valves.Are dynamic compressors.Use cylinder unloading.Are positive displacement compressors.

Back 156

Are positive displacement compressors.

Front 157

(4-074-2.07) Compression type packing:May be saturated with a lubricating material.Reduces the maintenance cost on the pump.Protects the shaft from scoring and corrosion.Is used with all mechanical seals.Should last the life of the pump.

Back 157

May be saturated with a lubricating material.

Front 158

(4-073-3.08) The capacity of a centrifugal pump:Varies with discharge pressure.Is fixed and can only be altered by changing the impeller.Indicates that the unit is a positive displacement type.Should be varied by suction valve manipulation.Can be altered by speed variation only.

Back 158

Varies with discharge pressure.

Front 159

(4-073-3.15) The capacity of a centrifugal pump should only be reduced by:Throttling the suction valve.Closing the suction valve.Closing both suction and discharge valves.Opening the pump casing vent valve.Throttling the discharge valve.

Back 159

Throttling the discharge valve.

Front 160

(4-074-2.06) What size of packing would you use to repack a pump gland having a stuffing box bore of 8.6 cm and a pump shaft diameter of 6.7 cm?0.5 cm1.9 cm0.675 cm1.6 cm0.95 cm

Back 160

0.95 cm

Front 161

(4-074-2.08) New pump packing should be installed:Tight enough to stop leakage.Loose enough to allow leakage for lubrication.Every shut down.Every year.Every time prior to start up.

Back 161

Loose enough to allow leakage for lubrication.

Front 162

(4-073-2.02) It is generally accurate to say that:9.8 kPa pressure results from every metre of water depth or height.A water height or depth of 10.34 metre results in 1 kPa.Atmospheric pressure has no bearing on static water head.10.21 kPa will result from 1 metre of static water head.1 kPa will result from a water head of 9.8 m.

Back 162

9.8 kPa pressure results from every metre of water depth or height.

Front 163

(4-073-3.16) A rotary pump:Is silent in operation.Has severe discharge pulsations.Should be equipped with a relief valve.Is a dynamic pump.Has very poor suction lift.

Back 163

Should be equipped with a relief valve.

Front 164

(4-075-1.01) The compressor that would favour volume over pressure would be the:Rotary lobeScrewAxialCentrifugalSliding vane

Back 164

Centrifugal

Front 165

(4-074-3.02) Proper priming and venting of a pump is important, especially if:The medium being pumped is high temperature.The medium being pumped contains suspended solids.Oil or other low flash point lubricant is being pumped.A mechanical seal is used.The pump has a stuffing box and lantern ring.

Back 165

A mechanical seal is used.

Front 166

(4-075-2.04) Intercoolers:Cool the air in the cylinders.Are used on all compressors.Must have a safety valve when used on positive displacement compressors.Cool compressor lubricating oil.Cool the air at the suction inlet.

Back 166

Must have a safety valve when used on positive displacement compressors.

Front 167

(4-073-3.02) Rotary pumps should be started with the discharge valve open because they are _____ pumps.DiffuserReciprocatingDouble-actingPositive displacementRegenerative

Back 167

Positive displacement

Front 168

(4-075-1.10) A belt driven lubricator is commonly found on a:Reciprocating double acting compressorScrew compressorRotary lobe compressorCentrifugal compressorSliding vane compressor

Back 168

Sliding vane compressor

Front 169

(4-074-2.09) The seal cage on the shaft of a centrifugal pump:Holds the shaft packing against the shoulder of the stuffing box.Assists in reducing shaft vibration.Distributes sealing fluid to the seal faces.Prevents fluid from leaking out of the pump casing.Reduces suction pressure drop.

Back 169

Distributes sealing fluid to the seal faces.

Front 170

(4-075-1.09) Centrifugal compressors:Are used for high pressure and low flow.Could be of the multi-stage type.Must have intercoolers when multi-staged.Must have a safety valve on the discharge when steam driven.Require inlet and discharge valves.

Back 170

Could be of the multi-stage type.

Front 171

(4-075-1.03) Sliding vane compressors:Are double acting compressors.Use suction and discharge valves.Are dynamic compressors.Use cylinder unloading.Are positive displacement compressors.

Back 171

Are positive displacement compressors.

Front 172

(4-073-3.01) The name given to the category of pumps that use gear teeth, vanes, or lobes to move the fluid being pumped is the _____ type.ReciprocatingAxial flowRadial flowDynamicRotary

Back 172

Rotary

Front 173

(4-074-3.04) A mechanical pump seal:Will have a substantial amount of leakage.Will cause more wear on the shaft than a packing seal.Is used for high pressure service.Does not need cooling.Is used in reciprocating pump service.

Back 173

Is used for high pressure service.

Front 174

(4-076-3.06) The instrument that measures the viscosity of an oil at a certain temperature as it flows through a small diameter tube, is called:An orifice plateA Saybolt viscometerAn oil meterA thermocoupleA pyrometer

Back 174

A Saybolt viscometer

Front 175

(4-076-3.01) If an oil’s viscosity changes much with little temperature change, it will then have a:Low viscosity indexHigh pour pointHigh carbon residueHigh viscosity indexLow pour point

Back 175

Low viscosity index

Front 176

(4-076-2.02) The majority of lubricants are:Animal fatsSynthetic oilsMineral oilsGreasesSolid types

Back 176

Mineral oils

Front 177

(4-076-2.06) Grease:Is a semi-liquid.Is an excellent high-speed, low load lubricant.Attracts dirt and water to bearings, leading to premature failure.Is likely to drip or splash from bearings and therefore is rarely used in the textile and food industries.Can be used under conditions where oil may leak away and leave the bearing dry.

Back 177

Can be used under conditions where oil may leak away and leave the bearing dry.

Front 178

(4-076-2.01) All semi-solid lubricants:Have a low viscosity.Are capable of sealing out dirt and water from bearings.Contain graphite.Resist moisture.Can be filtered.

Back 178

Are capable of sealing out dirt and water from bearings.

Front 179

(4-076-2.08) A material that is commonly used as a solid lubricant is:TallowMolybdate sulfideLimeMolybdenum disulfideSodium carbonate

Back 179

Molybdenum disulfide

Front 180

(4-076-3.09) Air compressor oil should:Have a very low viscosityHave low carbon residueHave a low flash point Not contain anti-oxidants"Have high shock absorption characteristics

Back 180

Have low carbon residue

Front 181

(4-076-3.13) The oil for a refrigeration compressor must:Have a low pour point.React chemically with the refrigerant.Have a high flash point.Have a high fire point.Be a multi-grade type.

Back 181

Have a low pour point.

Front 182

(4-076-2.03) The kind of grease used for heavily loaded machinery operating at slow speeds is the:Sodium base greaseSpecialty greaseMixed base greaseCalcium base greaseAluminum base grease

Back 182

Specialty grease

Front 183

(4-076-3.02) The point at which oil will give off enough vapour to ignite and burn continuously is known as the _____ point.FlashIgnitionFireVaporizationBurning

Back 183

Fire

Front 184

(4-076-3.10) High capacity steam turbine oils should:Have a low specific heatHave a very high viscosityBe fire resistantHave a low pour pointMix well with water

Back 184

Be fire resistant

Front 185

(4-076-3.05) Which of the following has the greatest effect on the viscosity of lubrication oil?PressureLoadFlowTemperatureSpeed

Back 185

Temperature

Front 186

(4-076-2.05) The characteristics of good grease are largely determined by:Its thickening agent or soapIts consistencyThe type of oil used in the greaseIts protective coatingIts color

Back 186

Its thickening agent or soap

Front 187

(4-076-2.09) If ambient air temperatures are very low, the preferred lubricant is a:SolidSemi-solidCastor oilTallowLiquid

Back 187

Solid

Front 188

(4-076-3.04) If you desire an oil to flow at a much lower temperature, you would most likely add:A viscosity index improverPour point depressantsA dispersantA thickening agentLow viscosity oil

Back 188

Pour point depressants

Front 189

(4-076-3.12) Which type of oil produces higher fluid friction?High viscosity oilLow viscosity oilLow viscosity oil with a high flash pointSynthetic oilsAll mineral oils

Back 189

High Viscosity Oil

Front 190

(4-077-2.04) The groove that is cut in the top half in the lining of a shell bearing should not extend closer to the ends than:3 mm10 mm1.25 cm1.7 cm2.5 cm

Back 190

1.25 cm

Front 191

(4-077-3.01) A collar thrust bearing:Must have a shiny surface.Can support more load than a Michell thrust bearing.Is an anti-friction type bearing.Is used with steam turbines only.Has boundary lubrication.

Back 191

Has boundary lubrication.

Front 192

(4-077-2.03) The ability of an oil to lift and support heavy loads depends upon:Liquid pressureHydraulic pressureSteam pressureWater pressurePour point

Back 192

Hydraulic pressure

Front 193

(4-077-4.06) A common cause of antifriction bearing failure is:High RPM serviceExtreme cold temperature crackingBroken drive beltsDrive motor overloadShaft misalignment

Back 193

Shaft misalignment

Front 194

(4-077-2.01) Large journal or sleeve bearings have grooves:In the high pressure area of the bearing babbit.Cut into the bearing housing.For distributing lubricant evenly just after the pressure area.In the non-pressure area.Cut in them for cooling purposes.

Back 194

In the non-pressure area.

Front 195

(4-077-4.02) The proper way to store a bearing after cleaning is to dip it in __________________ and wrap it in grease-proof paper.GasolineWaxSolventWaterA rust preventative

Back 195

A rust preventative

Front 196

(4-077-3.04) A thrust bearing which does not utilize the oil wedge principle of lubrication is the:Michell typeCollar typeFlotation typeKingsbury typeVertical type

Back 196

Collar type

Front 197

(4-077-1.02) A form of lubrication that requires continual motion of a shaft or surface is:Boundary lubricationContinuous lubricationForced lubricationAnti-friction lubricationFluid film lubrication

Back 197

Fluid film lubrication

Front 198

(4-077-3.05) An anti-friction bearing:Is constructed with white metal alloyEliminates all bearing frictionWears to a smooth, low-friction surfaceHas rolling frictionIs a sleeve bearing

Front 199

(4-077-2.06) A large journal bearing which is running hotter than normal can be cooled by:Direct application of cool water.Loosening the bearing caps.Decreasing the viscosity of the oil by cooling it.Adding pour point depressant to the oil.Pumping additional grease into it.

Back 199

Loosening the bearing caps.

Front 200

(4-077-2.02) A journal bearing:Controls thrust movementDoes not require lubricationImproves suction pressureDoes not require a housingSupports a shaft

Back 200

Supports a shaft

Front 201

(4-077-1.01) Fluid film lubrication:Eliminates all bearing friction.Is different from flood lubrication.Supports heavy loads.Does not separate the metal surfaces.Prevents wear during start-up.

Back 201

Supports heavy loads.

Front 202

(4-077-5.02) Applying installation forces through the balls of a bearing can cause:Bearing misalignmentFalse brinellingCracking or breaking of the ballsImproper lubricationBrinelling

Back 202

Brinelling

Front 203

(4-077-4.05) Using pressurized air to blow out a cleaned bearing:Should only be done in well-ventilated areas.Must be done only while the bearing is hot.Will cause the bearing to becomepittedIs a safe method of cleaning bearings.Is the best way of cleaning bearings.

Back 203

Will cause the bearing to becomepitted

Front 204

(4-077-5.01) A normal anti-friction bearing temperature operating range is:150°C to 160°C120°C to 250°C20°C to 50°C65°C to 70°C80°C to 120°C

Back 204

65°C to 70°C

Front 205

(4-077-3.01) A collar thrust bearing:Must have a shiny surface.Can support more load than a Michell thrust bearing.Is an anti-friction type bearing.Is used with steam turbines only.Has boundary lubrication.

Back 205

`Has boundary lubrication.

Front 206

(4-077-4.04) When replacing or removing an anti-friction ball bearing, the applied force should:Not be transmitted through the bearing balls.Always be against the inner race.Always be against the outer race.Be applied suddenly and fully.Be made only after heating the bearing.

Back 206

Not be transmitted through the bearing balls.

Front 207

(4-077-4.01) When inspecting a dismantled bearing, the first indication of a failing bearing is:Cracked ballsRoughnessDiscolorationRusting or corrosionTapered rollers

Back 207

Roughness

Front 208

4-077-4.03) When grease is used in an antifriction bearing, the bearing housing should not be filled _____ full.More than 1/4More than 1/3More than 1/2More than 3/4Less than completely

Back 208

More than 1/3

Front 209

(4-076-1.01) The inter-meshing of gear teeth is a place where lubrication:Corrosion reduction is very important.Friction reduction is very important.Sealing is very important.Shock absorption is very important.Temperature control is very important.

Back 209

Shock absorption is very important.

Front 210

(4-076-2.01) All semi-solid lubricants:Have a low viscosity.Are capable of sealing out dirt and water from bearings.Contain graphite.Resist moisture.Can be filtered.

Back 210

Are capable of sealing out dirt and water from bearings.

Front 211

(4-077-3.05) An anti-friction bearing:Is constructed with white metal alloyEliminates all bearing frictionWears to a smooth, low-friction surfaceHas rolling frictionIs a sleeve bearing

Back 211

Has rolling friction

Front 212

(4-077-2.05) A shell type bearing:Is used for axial thrust.Is an anti-friction bearing.Gives rolling friction to the shaft.Consists of ball bearings in a shell.Is used for heavy loads.

Back 212

Is used for heavy loads.

Front 213

(4-076-3.08) Greases are a mixture of mineral oil and:Carbon powderSoapLardSynthetic oilsParaffin

Back 213

Soap

Front 214

(4-077-3.02) A type of anti-friction bearing is the _____ .BushingKingsburyBall bearingSleeve bearingJournal bearing

Back 214

Ball bearing

Front 215

(4-076-3.11) The _____ number of oil indicates the acidity of oil.phAcidityAlkalinityNeutralizationViscosity index

Back 215

Neutralization

Front 216

(4-076-3.03) The property of oil that indicates its ability to support a load is:ViscosityViscosity indexPour pointFloc pointConsistency

Back 216

Viscosity

Front 217

(4-076-3.07) The resistance of a liquid to internal deformation or shear is known as:Pour pointViscosity indexFlash pointViscosityFriction resistance

Back 217

Viscosity

Front 218

(4-078-3.05) The unit of measure for electrical current flow is:OhmWattVoltAmpereElectron

Back 218

Ampere

Front 219

(4-078-1.05) The flow of electrons in a uniform direction is called:Voltage dropCurrentPotential differenceElectromotive flowConductivity

Back 219

Current

Front 220

(4-078-5.01) Three resistors of 20, 60 and 120 Ω are connected in parallel with a current flow of 60 A. The applied voltage will be _____ V.72001200080013.330.33

Back 220

800??

Front 221

(4-078-3.01) The value of the current flow in an electric circuit, where the voltage is 12 V and the resistance is 3 Ω is:4 W36 A0.25 A4 A3.6 A

Back 221

4 A

Front 222

(4-078-2.02) The purpose of having an upward movement of a switch handle to close the switch is:To have the handle out of the way.To meet the requirements of the electrical codes.Because it is easier to operate when opening the switch.It indicates the condition of the circuit.To prevent the switch from closing due to gravity.

Back 222

To prevent the switch from closing due to gravity.

Front 223

(4-078-1.10) When a number of electrons pass a given point over a specific time period the energy may be referred to as:An ampereVoltageAn ohmPower or wattsElectromotive force

Back 223

An ampere

Front 224

(4-078-7.07) The voltage required to be supplied to a 12 kW motor drawing 24 A is:5 kV50 kV288 v2 kV500 V

Front 225

(4-078-2.01) A closed electrical circuit will:Close-off the flow of current.Contain an open switch or relay contact.Be series only.Be parallel only.Allow current to flow.

Back 225

Allow current to flow

Front 226

(4-078-1.02) A basic law of electricity is, unlike charge attract each other and like charges:Repel each otherHold each otherAttract each otherNeutralize each otherAmplify each other

Back 226

Repel each other

Front 227

(4-078-7.03) Electrical power can be determined by the formula:P = E x II = E x RE = I x RR = E x IP = I x R

Back 227

P = E x I

Front 228

(4-078-3.06) The unit for opposition to current flow is the:VoltAmpereOhmWattNewton

Back 228

Ohm

Front 229

(4-078-2.05) A triple pole single throw switch is one that:Opens and closes three wires of an electrical circuit.Has three magnetic poles.Is used for three phase circuits only.Cannot operate manually.Requires three toggles.

Back 229

Opens and closes three wires of an electrical circuit.

Front 230

(4-078-1.03) Since the discovery of electrons, it has been determined that electrons are a negative charge and flow from:Positive to negativeNorth to southNegative to positiveA lower potential to a higher potentialHigh amperage to low amperage

Back 230

Negative to positive

Front 231

(4-078-1.11) Atoms that have greater numbers of electrons in the outer shell are:Positively chargedGood conductorsPoor insulatorsNeutrally chargedPoor conductors

Back 231

Poor conductors

Front 232

(4-078-6.02) Most conductors tend to:Increase in resistance with increase in temperature.Decrease in resistance with increase in temperature.Shrink when heated.Increase in resistance when decreased in length.Increase in resistance over time.

Back 232

Increase in resistance with increase in temperature.

Front 233

(4-078-6.01) A conductor's resistance is:Directly proportional to its cross-sectional area.Directly proportional to its diameter.Inversely proportional to its cross-sectional area.Unaffected by its cross-sectional area.Unaffected by its temperature.

Back 233

Inversely proportional to its cross-sectional area.

Front 234

(4-078-3.09) The voltage required to force a current of 15 A through a resistance of 5 Ω will be _____ V.0.3337.53375

Front 235

(4-078-4.01) Three resistances of 20, 50 and 80 Ω make up a series circuit. The supply voltage is 400 V. The current flowing would be:2.67 A20 A8 A5 A0.375 A

Back 235

2.67 A

Front 236

(4-078-5.02) The total circuit resistance is less than a value of any individual resistor:When voltage is decreased.When the resistors are wired in parallel.If the amperage is increased.When the resistors are wired in series.When a circuit opened

Back 236

When the resistors are wired in parallel.

Front 237

(4-078-7.05) Neglecting the efficiency of a 15 kW motor connected to a 400 V supply, the amperage will be _____ A.26.66737.50.03753.752.667

Back 237

37.5

Front 238

(4-078-7.01) If the power dissipated by a resistor is 1.2 kW when supplied with 110 V, the amperage will be _____ A.91.6660.1119.00610.91132

Back 238

10.91

Front 239

(4-078-3.02) When 1 ampere of current flows through a resistance by the application of 1 volt the resistance will be 1:WattJouleKilowattAmpereOhm

Back 239

Ohm

Front 240

(4-078-7.02) The basic unit of mechanical or electric power is the:VoltWattAmpereOhmNewton

Back 240

Watt

Front 241

(4-078-5.03) The equivalent resistance of three resistances of 10, 25 and 50 Ω connected in parallel is _____ Ω.0.166.258518.758.5

Back 241

6.25

Front 242

(4-079-1.12) The property that determines whether a material will be easily magnetized or not is called:ReactionConductivityFluctuationMagnetismPermeability

Back 242

Permeability

Front 243

(4-079-2.04) The direction of the _____ due to motor action may be determined using Fleming's Left Hand Rule.ForceCurrentResistanceRotationApplied voltage

Back 243

Force

Front 244

(4-079-1.03) If a material provides resistance to magnetic flux, it is demonstrating:ResistanceReluctanceImpedanceRepulsionVoltage drop

Back 244

Reluctance

Front 245

(4-079-2.09) Commutation is the process of converting AC to _____ in a DC generator.HeatDirect currentVoltagePowerResistance

Back 245

Direct current

Front 246

(4-079-1.05) Current flow direction and intensity, through a conductor, will:Affect magnetic field direction and intensity.Affect the voltage.Affect the resistance of a circuit.Not affect the electromagnetic field direction.Not affect the electromagnetic field intensity

Back 246

Affect magnetic field direction and intensity.

Front 247

(4-079-2.02) The minimum voltage generated by a single loop DC generator occurs when the conductor is traveling relative to the magnetic lines of force at an angle of:45°90°120°,180°"270°

Back 247

270°

Front 248

(4-079-2.10) If a conductor is forced to _____ magnetic lines of force, an electromotive force is induced in the conductor.Align itself withReduceMove acrossIncreaseStay away from

Back 248

Move across

Front 249

(4-079-2.05) The maximum voltage generated by a single loop DC generator occurs, when the conductor is cutting the magnetic lines of force at an angle of:0°45°90°120°,180°"

Back 249

90°

Front 250

(4-079-2.06) Faraday discovered:The Right Hand Rule for conductors.That a conductor will have a voltage induced if it cuts magnetic flux.The Left Hand Rule for motors.The Left Hand Rule for generators.That current flows from positive to negative.

Back 250

That a conductor will have a voltage induced if it cuts magnetic flux.

Front 251

(4-079-2.08) Consider a current-carrying conductor located in a magnetic field. If the current in the conductor reverses, the force tending to move the conductor will:Increase in magnitudeRemain constantDecrease in magnitudeReverse directionBe cancelled out

Front 252

(4-079-1.09) If a few turns of wire are wrapped around a core of soft iron and a current of electricity passed through the wire, you will have:A transformerA circuit breakerAn electro-magnetA commutatorA generator

Back 252

An electro-magnet

Front 253

(4-079-1.08) Magnetite is also known as:Iron oreNon-ferrous metalLodestoneHematiteLimonite

Back 253

Lodestone

Front 254

(4-079-1.04) Iron and steel may be magnetized by rubbing the metal with a:Stainless steelSteel woolBrass rodMagnetAn iron filing compound

Back 254

Magnet

Front 255

(4-079-1.12) The property that determines whether a material will be easily magnetized or not is called:ReactionConductivityFluctuationMagnetismPermeability

Back 255

Permeability

Front 256

(4-079-1.01) Magnetic flux can be said to be:Lines of force within a magnet and flowing N to S.Lines of force outside a magnet and flowing N to S.A magnetic field.Lines of force flowing S to N outside a magnet.Lines of force flowing in a magnet.

Back 256

Lines of force outside a magnet and flowing N to S.

Front 257

(4-079-1.07) If a material has a low reluctance, it has a high:PermeabilityConductivityFluctuationv,Magnetism"Capacitance

Back 257

Permeability

Front 258

(4-079-1.02) When current flows in a conductor:AC voltage is generated.The voltage is reduced in the conductor.The conductor develops north and south poles.A circular magnetic field is set up around the conductor.All magnetic forces are dissipated.

Front 259

(4-079-3.01) A conductor supplied with current while in a magnetic field will:Tend to move at right angles to the flux lines.Tend to remain stationary.Want to move with the flux lines.Have a current induced into it.Demonstrate generator theory.

Back 259

Tend to move at right angles to the flux lines.

Front 260

4-079-3.02) When using Fleming's Left Hand Rule, the index finger represents:Magnetic flux direction, for generators.Conductor motion direction, for motors.Conductor motion direction, for generators.Flux direction, for motors.Direction of current flow, for motors.

Front 261

(4-079-2.08) Consider a current-carrying conductor located in a magnetic field. If the current in the conductor reverses, the force tending to move the conductor will:Increase in magnitudeRemain constantDecrease in magnitudeReverse directionBe cancelled out

Back 261

Reverse direction

Front 262

(4-079-1.10) The total number of lines of force in a magnetic field is:Known as the EMF.Controlled by varying the temperature.Called the magnetic flux.Determined by the north magnetic pole.Depends on the force of gravity.

Back 262

Called the magnetic flux.

Front 263

(4-079-3.03) A current carrying conductor being moved by a magnetic field is the principle known as:Magnetic fluxElectrolysisHydro-electricsGenerator actionMotor action

Back 263

Motor action

Front 264

(4-080-1.05) Clamp-on ammeter readings may be inaccurate if:Jaws are dirty or misaligned.Circuit voltage is too high.Circuit resistance is too low.Circuit power is too high.Conductor insulation is too thick

Back 264

Jaws are dirty or misaligned.

Front 265

(4-080-1.06) The most common measurement made with an electrical meter is:AmperageWattsResistanceVoltageCapacitance

Back 265

Voltage

Front 266

(4-080-2.04) Utility companies have a surcharge to their customers based on:The maximum voltage usedThe maximum amperage usedSystem capacitanceTransformer efficiencyPeak power demand

Back 266

Peak power demand

Front 267

(4-080-2.05) A kilowatt-hour meter has a small motor which:Turns at a constant speed.Slows down as power consumption increases.Has a speed proportional to power consumption.Indicates the multiplier to be used when reading the meter.Moves the meter demand pointer.

Back 267

Has a speed proportional to power consumption.

Front 268

(4-080-1.03) A clamp-on ammeter measures current flow by using:Shunting current through a milli-ammeter.Differential current flow between two conductors.A basic transformer principle.A portion of circuit resistance.Electromagnetism.

Back 268

A basic transformer principle.

Front 269

(4-080-1.04) Ammeters are connected with the negative or black lead connected to the:Positive side of the circuit.North pole of the circuit.Negative side of the circuit.Switch of the circuit.Neutral wire of the circuit.

Back 269

Negative side of the circuit.

Front 270

(4-080-1.07) A voltmeter must ______________ electrical circuit.Offer low resistance to theOffer no resistance to theOffer slight resistance to theOffer high resistance to theInterfere with the

Back 270

Offer high resistance to the

Front 271

(4-080-1.02) Whenever voltmeters are connected to a direct current, the:Positive lead must be connected to the positive point of the circuit.Positive lead must be connected to the negative point in the circuit.Positive lead must be connected to the neutral point in the circuit.Negative lead must be disconnected from the circuit.Positive lead must be disconnected from the circuit.

Back 271

Positive lead must be connected to the positive point of the circuit.

Front 272

(4-080-1.01) The voltmeter is placed:In series with the ammeter.In parallel with the circuit.Across the ohmmeter.In series with the circuit.Between the battery and the first resistance.

Back 272

In parallel with the circuit.

Front 273

(4-080-1.09) Ammeters are connected:In parallel with the circuit.In series with the circuit.In parallel with the circuit to measure the resistance.So that voltage will bypass the meter.To the negative and positive terminals of the battery.

Back 273

In series with the circuit

Front 274

(4-081-1.13) The strength of the magnetic field produced in a shunt wound generator:Is weakIs fairly constantFluctuatesIs regulated by an external AC supplyIncreases with generator load

Back 274

Is fairly constant

Front 275

(4-081-2.01) An AC motor which will drop out of synchronism and simply trip when overloaded is the:Slip-ring induction motorInduction motorWound rotor induction motorSynchronous motorSingle phase motor

Back 275

Synchronous motor

Front 276

(4-081-1.02) The _____ of a DC machine is built up of laminated steel plates mounted on a shaft. The coils are connected to a commutator mounted on one end of the rotor shaft.ArmatureYokeCoreStatorRheostat

Back 276

Armature

Front 277

(4-081-1.03) The connection provided on DC motors to supply the armature with power:Are slip ringsAre field polesIs a rheostatIs a commutatorIs hard-wired

Back 277

Is a commutator

Front 278

(4-081-2.09) Synchronous motors have construction that is identical to:DC series motorsDC shunt motorsAC induction motorsWound-rotor motorsAlternators

Back 278

Alternators

Front 279

(4-081-2.03) For three-phase power, each conductor is _____ electrical degrees out of phase with the others.3090120180360

Back 279

120

Front 280

(4-081-1.15) A rheostat is also known as:A voltage regulatorAn automatic resistorA current controllerA variable resistorAn exciter

Back 280

A variable resistor

Front 281

(4-081-1.12) In order to produce the strength of magnetic flux required in larger DC machines:Electro magnets are used.High voltage is used.Permanent magnets are used.The field windings are double-wound.Transformers are used.

Back 281

Electro magnets are used.

Front 282

(4-081-2.13) To transfer the power to or from the rotor of alternators, ____________ are used.Field polesRheostatsCommutatorsSlip ringsHard-wired connections

Back 282

Slip rings

Front 283

(4-081-2.06) Alternators must run at constant speed in order to maintain:CurrentPower outputConstant voltageResistanceFrequency

Back 283

Frequency

Front 284

(4-082-1.03) A transformer works on the principle of:HysteresisElectro-Magnetic inductionEddy currentsFaraday's lawFlux leakage

Back 284

Electro-Magnetic induction

Front 285

(4-082-2.05) Single-phase transformers:Use two common forms of construction known as the core type and the shell type.High voltage coil is nearest the iron core.Use two common forms of construction known as the internal type and the external type.Are very low in efficiency.Are used in all power supplies.

Back 285

Use two common forms of construction known as the core type and the shell type.

Front 286

(4-082-4.02) Transformer cooling oil has:A higher specific heat than air.A poorer insulating characteristic than air.A very high pour-point.A high viscosity.PCBs to make it non-toxic.

Back 286

A higher specific heat than air.

Front 287

(4-082-2.02) Transformers are rated in:PolarityService factorWattsCore temperaturekVA

Back 287

kVA

Front 288

(4-082-2.06) A transformer has a primary voltage of 500 volts and 20 turns on the primary winding. If the secondary winding has 5 turns, the voltage of the secondary is:2000 volts2500 volts125 volts100 volts4 volts

Back 288

125 volts

Front 289

(4-082-3.05) An instrument transformer used to measure voltage is called a:Current transformerStep down transformerPotential transformerStep up transformerAuto-transformer

Back 289

Potential transformer

Front 290

(4-082-4.03) Because of environmental concerns, it is no longer permissible to add ____________ to transformer oil.ChelatesAnti-foaming substancesChlorinated hydrocarbonsFreonOrganic compounds

Back 290

Chlorinated hydrocarbons

Front 291

(4-082-3.03) An operating current transformer should never:Be inspected until properly grounded.Have its primary circuit opened.Produce excessively high voltages.Have its secondary circuit opened first.Have its secondary connected to a meter.

Back 291

Have its secondary circuit opened first.

Front 292

(4-082-3.07) Three-phase transformers have:Two windingsThree windingsTwo windings on the primary side and one on the secondarySix windingsNine windings

Back 292

Six windings

Front 293

(4-082-1.01) When AC action causes a counter current in a coil of wire, it is termed:Self-inductanceCapacitanceHysteresisMutual inductanceElectromagnetic induction

Back 293

Self-inductance

Front 294

(4-083-4.01) Tie breakers are used to:Allow the interconnection of two power sources without placing them in parallel.Break the circuit in case of overload.Protect the transformer from the power source.Protect the plant service bus from the power source.Connect the plant load to the power source.

Back 294

Allow the interconnection of two power sources without placing them in parallel.

Front 295

(4-083-1.03) When working with high voltage systems, the minimum distance of approach should be not less than:1 m5 m2 m3 m0.5 m

Back 295

2 m

Front 296

(4-083-1.06) Low voltages include all voltages between _____ V.0 and 3030 and 11030 and 22030 and 750100 and 750

Back 296

30 and 750

Front 297

(4-083-3.1) The utility’s responsibility does not go beyond a customer's: First branch lineFirst over current devicePrimary transformerFirst trunk circuitMotor control center

Back 297

First over current device

Front 298

(4-083-1.09) Choose the statement that is FALSE. In an electrical system the neutral wire:Is connected to earth at one or more points.Is not attached to a circuit breaker or fuse.Is called theidentifiedCarries current in a three-wire system when the loads are balanced.Is white in colour.

Back 298

Carries current in a three-wire system when the loads are balanced.

Front 299

(4-083-2.02) The electrical schematic or elementary diagram shows:The relative physical arrangement of components including all wiring and connections.The location, markings and interconnection of each terminal.By means of graphical symbols the function, sequence, connection and electrical relationship of each circuit.By means of single lines and simplified symbols the electrical distribution system in a multi-story building.A one line diagram where each line represents all of the conductors in the circuit.

Back 299

By means of graphical symbols the function, sequence, connection and electrical relationship of each circuit.

Front 300

(4-083-1.08) A 120/208 V system is best described as a:Three phase four-wire systemSingle phase one-wire systemThree phase three-wire systemOne phase four-wire systemTwo phase three-wire system

Back 300

Three phase four-wire system

Front 301

(4-083-1.07) High voltages include all voltages above _____ V.2207501,00015,00072,000

Back 301

750

Front 302

(4-083-3.02) An electrical distribution system is composed of service, feeders and:Secondary circuitsPrimary circuitsBranch circuitsTrunk circuitsTertiary circuits

Back 302

Branch circuits

Front 303

(4-083-1.10) Extra low voltages include all voltages below _____ V.3050110220440

Back 303

30

Front 304

(4-084-1.3) In a “closed loop” system of control, the control behaviour is:AutomaticBoth automatic and manualManual onlyIntermittentInaccurate

Front 305

(4-084-1.10) A controller is a device that primarily:Sends or transmits a positive rather than negative signal.Tries to maintain a set point.Records a systemNotifies operators of errors or faults in a system.Is a logic device capable of making decisions.

Back 305

Tries to maintain a set point.

Front 306

(4-084-1.11) A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the:Process variableFinal variableManipulated variableControlled variableTransmitting variable

Back 306

Manipulated variable

Front 307

(4-084-4.01) Automatic systems that can make decisions are termed:Annunciation systemsIndicating systemsLogic systemsOpen loop systemsGo-NoGo systems

Back 307

Logic systems

Front 308

(4-084-1.02) An automatic/manual transfer station:Allows the operator to manually change the set-point.Allows the operator to position the final control element.Allows the operator to manipulate the signal from the primary sensing element.Transfers a process into manual mode automatically.Is rarely installed in a control system.

Back 308

Allows the operator to position the final control element.

Front 309

(4-084-2.03) For a pneumatic control system, it is imperative thatThe maximum transmitter output signal pressure be maintained.The air supply is kept clean and dry.The control systems have built-in redundancy.The compressed air supply remains above 1725 kPa.The control devices are fitted with noise attenuators.

Back 309

The air supply is kept clean and dry

Front 310

(4-084-1.13) When a process variable has no method of sending information to the final control element the system is known as:An automatic systemAn open loop systemA cascade systemA feedback systemA feedforward system

Back 310

An open loop system

Front 311

(4-084-2.02) Pneumatic signals operate between:20 and 200 kPa0 and 100 kPa50 and 500 kPa20 and 100 kPa20 and 200 kPa

Back 311

20 and 100 kPa

Front 312

(4-084-3.03) The apparatus which converts current signals to pneumatic and pneumatic to current signals is called a:ConverterInducerInverterTransducerTransformer

Back 312

Transducer

Front 313

(4-084-1.08) An upset in a plant process is called a/an:AgitationDisruptionDisturbanceErrorMalfunction

Back 313

Disturbance

Front 314

(4-085-4.05) A thermocouple measures:PressureTemperatureFlowVelocityLight

Back 314

Temperature

Front 315

(4-085-4.04) Thermocouples require:A bi-metallic strip or coilA thermopileTwo dissimilar metalsAn elliptical sectioned tubeA heating element

Back 315

Two dissimilar metals

Front 316

(4-085-1.08) One of the most important and commonly measured process variables in a system is:ViscosityPressureDensityPurityComposition

Back 316

Pressure

Front 317

(4-085-2.02) The constant head connection in a remote water level indicator is made to the:Feed water pump dischargeWater spaceAtmosphereFeed water regulating valveSteam space

Back 317

Steam space

Front 318

(4-085-5.02) A chromatograph uses electronic devices which:Utilize electrical current as a measurement base.Have inverse resistance properties relative to temperature.Increase in resistance as temperature rises.Work in conjunction with a thermocouple.Are made of Chromel and Alumel.

Back 318

Have inverse resistance properties relative to temperature.

Front 319

(4-085-1.06) Low pressures and vacuums may be measured:With a transducerWith a rotameterIn MPaWith a manometerIn milli-Newtons

Back 319

With a manometer

Front 320

(4-085-4.09) A thermocouple consists of:A filament that is compared to the object being measured.Two dissimilar wires connected together to form a hot and a reference junction.Two dissimilar wires connected to a battery.A thermally-conductive fluid, held within a fine tube.A thermistor, coupled to a wheatstone bridge.

Back 320

Two dissimilar wires connected together to form a hot and a reference junction.

Front 321

(4-085-4.02) The coefficient of expansion of mercury is nearly linear for temperatures between:-50 and 400°C-39 and 450°C-45 and 500°C100 and 500°C20 and 200°C

Back 321

-39 and 450°C

Front 322

(4-085-3.03) An orifice plate with a round opening that is centred in the middle of the plate is called a:Segmental orificeConcentric orificeEccentric orificeConcentric flangeCentralized flow

Back 322

Concentric orifice

Front 323

(4-085-5.01) Liquids must be vapourized:In order to measure density.If purity is to be measured.When a chromatograph is being used.When conductivity is measured.When resistance or reluctance is being measured.

Back 323

When a chromatograph is being used.

Front 324

(4-086-3.03) A valve actuator:Cannot be reverse acting.Will always have one side of the diaphragm open to atmosphere.Is a two-position device.Position is a function of controller output.Causes a valve to always fail open.

Back 324

Position is a function of controller output.

Front 325

(4-086-3.02) A valve which gives good throttling action, takes less actuator force, but does not seal well is a:Double seated valveReverse acting valveMultiple-disc valveSingle seated valveDirect acting valve

Back 325

Double seated valve

Front 326

(4-086-1.04) On a basic pneumatic transmitter, a movement of the flapper towards nozzle will:Increase the nozzle bleed.Change the size of the supply orifice.Maintain steady transmitter output.Change transmitter supply pressure.Increase feedback bellows pressure.

Back 326

Increase feedback bellows pressure.

Front 327

(4-086-3.11) A control valve that has one plug that moves upward to close the port is called:Reverse acting single portedDouble seated direct actingReverse acting diaphragm actuatedDirect acting single portedA solenoid

Back 327

Reverse acting single ported

Front 328

(4-086-3.07) In an automatic control system the controller output signal goes directly to the:TransmitterSensing elementRecorderFinal control elementProcess variable

Back 328

Final control element

Front 329

(4-086-2.03) A circular chart recorder:Provides a different function than a strip chart.Is newer design than a strip chart.May incorporate a bourdon tube.Does not provide a permanent record.Is used on a computer screen.

Back 329

May incorporate a bourdon tube

Front 330

(4-086-3.16) Cascade control utilizes:One controller, one transmitter and two valves.One controller, two transmitters and two valves.Two controllers, one transmitter and two valves.Two controllers, two transmitters and two valves.Two controllers, two transmitters and one valve.

Back 330

Two controllers, two transmitters and one valve

Front 331

(4-086-3.10) Most solenoid valves operate so that the upstream line pressure will:Act to open the valve.Be less than downstream pressure.Be sensed by a transmitter.Act to close the valve.Must pass through a restriction or nozzle.

Back 331

Act to close the valve.

Front 332

(4-086-2.02) A recorder utilizing a spiral Bourdon tube will have a pen movement:On a logarithmic scale.Proportional to the change in tube pressure.That is often imperceptible.Range of 0 to 24 hours.Range of 0 to 7 days.

Back 332

Proportional to the change in tube pressure.

Front 333

(4-086-1.02) A sensing element sends its signal to:A TransmitterAn air lineA ConveyerA Flapper and nozzleA Recorder

Back 333

A Transmitter

Front 334

(4-087-5.10) Modulating pressure controller output:Will shut down and start up the burner.Will vary the fuel and air flow to the boiler.Will control the temperature of the furnace.Is used on small boilers only.Is unresponsive to steam flow.

Back 334

Will vary the fuel and air flow to the boiler.

Front 335

(4-087-3.03) The drain of a hot water boiler low water fuel cutoff should be opened to flush out any debris:AnnuallyDailyWeeklyMonthlyEach shift

Back 335

Weekly

Front 336

(4-087-1.02) A float operated low water fuel cutoff has its switch separated from boiler pressure by:A float cageA seal cageA flexible diaphragmA siphonPacking

Back 336

A flexible diaphragm

Front 337

(4-087-5.05) An automatic boiler On-Off or operating control switch has an adjustment for pressure set-point and another for:A differential between the twoManual or automatic controlFor rate of modulationHigh steam pressure limitRate of feedback

Back 337

A differential between the two

Front 338

(4-087-5.02) A sudden drop in steam pressure causes:A sudden increase in drum level.A rapid collapse of steam bubbles in the boiler.A drop in drum level.A single element feedwater control to immediately add water to the drum.

Back 338

A sudden increase in drum level.

Front 339

(4-087-i.01) A steam boiler must be equipped with two low water fuel cut-off devices when the boiler:Has over 47 m² of heating surfaceHas dual fuelsIs not continuously attendedUses coal as fuelHas two burners

Back 339

Is not continuously attended

Front 340

(4-087-1.03) A mercury switch bulb is under high vacuum and contains inert gas:So it will not explode.To prevent corrosion of the contacts.To decrease electrical resistance.So contacts will not overheat.Because the switch is normally closed.

Back 340

To prevent corrosion of the contacts.

Front 341

(4-087-5.08) The main controlling device used with an On/Off combustion fuel control is a _____ sensing element.PressureLevelFlowElectronicPneumatic

Back 341

Pressure

Front 342

(4-087-3.05) The most reliable method of checking or testing a low water fuel cutoff is to:Blow the low water cutoff down through the water column until the burner cuts out.Blow the float chamber down to see if the burner will cut out.Lower the water in the boiler to the level where the burner should cut out.Blow down the sight glass to see if the burner goes out.Manually trip the mercury switches to shut off the burner.

Back 342

Lower the water in the boiler to the level where the burner should cut out.

Front 343

(4-087-4.04) Single element feed water control systems are very efficient in maintaining the boiler water level when:The boiler has a large water capacity.The boiler is a fire tube boiler.The fluctuations in load are slow and small.Load demands are low.The boiler is gas fired.

Back 343

The fluctuations in load are slow and small.

Front 344

(4-088-2.07) On a gas fired automatic boiler a normal programmed start-up takes approximately:105 seconds55 seconds27 - 40 seconds120 seconds70 seconds

Back 344

105 seconds

Front 345

(4-088-1.03) The manual fuel shut-off valves of an automatic oil-fired boiler must be opened:Prior to pre-purging.After pre-purging and just prior to pilot ignition.Immediately after completion of the pilot flame trial.After the automatic main burner fuel valve opens.At the same time as the automatic main burner fuel valve.

Back 345

Prior to pre-purging.

Front 346

(4-088-2.08) If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur:If the trial for ignition period has lasted approximately 15 to 30 seconds.Immediately.Within 4 or 5 seconds.After the flame relay de-energizes.After the main burner flame ignites.

Back 346

If the trial for ignition period has lasted approximately 15 to 30 seconds.

Front 347

(4-088-3.03) If the pilot flame is adequate but the main burner fails to ignite, the programmer must:Hold the program in its present state.Recycle the start-up sequence.Proceed to post purge and lockout while sounding an alarm.Go directly to a lockout condition.Sound an alarm.

Back 347

Proceed to post purge and lockout while sounding an alarm.

Front 348

(4-088-3.01) During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect:A boiler low water level.The main burner manual fuel valve is closed.The pilot manual fuel valve is closed.Boiler steam pressure operating control switch is open.The flame scanner is weak.

Back 348

The pilot manual fuel valve is closed.

Front 349

(4-088-2.05) At the end of the pre-purge period, the combustion programmer:Shuts downOpens the main fuel valveCloses the pilot valveEnds the ignition trialEnergizes the ignition transformer

Back 349

Energizes the ignition transformer

Front 350

(4-088-2.06) The programmer will go through a post purge:Only if pilot fails to ignite.Only on flame failure.By manually advancing the timer.On any type shutdown except, power outage.On routine shutdown only.

Back 350

On any type shutdown except, power outage

Front 351

(4-088-2.02) When an automatic unattended boiler starts up, the program timer will first:Energize the ignition transformer and pilot gas solenoid valve.Start the post purge period.Start the forced draft fan.Energize the main gas valve.Energize the main feed water valve.

Back 351

Start the forced draft fan.

Front 352

(4-088-1.01) An interrupted pilot of an automatic boiler:Burns continuously, like that in a home furnace.Ignites before the main burner ignites, and is extinguished when the main burner is extinguished.Is one that has been extinguished by an inadequate flame signal.Ignites, is proven stable and extinguishes after the main flame is established.Must be manually ignited.

Back 352

Ignites, is proven stable and extinguishes after the main flame is established.

Front 353

(4-088-1.04) The primary function of a programming control is to:Alert the operator of adverse operating conditions.Maintain the air-fuel ratio of the burner.Start or stop a burner following a safe sequence.Regulate the air flow and the fuel flow in accordance with steam demand.Maintain constant drum pressure.

Back 353

Start or stop a burner following a safe sequence.

Front 354

(4-090-1.07) Boiler water legs:Increase the radiant heating surface.Surround the furnace entirely.Make water treatment less critical.Support the boiler on concrete piers.Make waterside maintenance easier.

Back 354

Increase the radiant heating surface.

Front 355

(4-090-1.08) Most low capacity cast iron boilers:Cannot be site assembled.Can withstand higher pressures.Will pass through standard size doorways.Are factory assembled as packaged units.Require special foundations.

Back 355

Will pass through standard size doorways.

Front 356

(4-090-3.01) Modular cast iron boiler water flow is:Continuous through all modules.Connected in series.Intermittent, occurring only while the unit is firing.Always vertically upwards.Done without the use of headers or manifolds.

Back 356

Continuous through all modules.

Front 357

(4-090-1.04) One advantage of cast iron boilers is:Their high factor of brittleness.Reduced vibration due to their heavy foundations.Unlimited operating pressures.Resistance to corrosion.Their capacity is fixed and cannot be increased.

Back 357

Resistance to corrosion.

Front 358

(4-090-2.03) The ratio of heat released to heat transferred to boiler water is known as:Combustion efficiencyHeating surface efficiencyBoiler efficiencySection ratioEnthalpy transfer ratio

Back 358

Boiler efficiency

Front 359

(4-090-2.01) Heating boilers attain maximum efficiency only when they are operated:Intermittently at 90% of the loadIntermittently at half loadContinuously at full loadContinuously at half loadContinuously at 75% of the load

Back 359

Continuously at full load

Front 360

(4-090-1.02) In a vertical sectional boiler, the sections are placed:One above the otherSide by sideOn the furnaceAbove the draft hood180° to each other

Back 360

Side by side

Front 361

(4-090-1.01) The sections of a cast iron sectional boiler are held together by:Cast iron pipesHigh-temperature ropeSteel studsPush nipples and tie rodsStay bolts

Back 361

Push nipples and tie rods

Front 362

(4-090-1.06) The steam and water spaces of a cast iron sectional boiler are connected by:Tie rodsTie nipplesHydraulic jacksSteel studsPush nipples

Back 362

Push nipples

Front 363

(4-090-1.03) The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:Effectiveness of heat transferSteam spaceWater spaceWater circulationSteam quality

Back 363

Effectiveness of heat transfer

Front 364

(4-091-1.04) An atomizing air compressor is usually:A variable displacement typeA centrifugal typeAn axial typeA small, rotary air compressorA regenerative type

Back 364

A small, rotary air compressor

Front 365

(4-091-1.10) An air atomizing burner utilizes an air pressure of approximately:15 kPa150 kPa75 kPa95 kPa100 kPa

Back 365

100 kPa

Front 366

(4-091-3.02) Maximum static pressure in a fuel oil line before the oil pump is limited by code to approximately:10 kPa15 kPa80 kPa35 kPa70 kPa

Back 366

35 kPa

Front 367

(4-091-1.11) When using mechanical fuel oil atomization:70 kPa steam pressure is required at the burner.Dry saturated steam or superheated steam should be used.High pump pressure is required.Steam pressure is required to keep the bypass open.35 to 40 kPa oil pressure is required.

Back 367

High pump pressure is required.

Front 368

(4-091-3.01) A modulating pressure atomizer has its return oil flow regulated by:A modulating valve to the burnerA modulating valve in the return lineA solenoid valve in the return lineA pressure regulatorPump speed

Back 368

A modulating valve in the return line

Front 369

(4-091-1.01) Regulations require that the minimum distance between an oil-fired furnace and an indoor oil storage tank must be:7 m5.2 m0.6 m4.7 m9.8 m

Back 369

0.6 m

Front 370

(4-091-1.02) Which of the following is NOT a type of oil burner?Atmospheric burnersSteam atomizing burnersMechanical or pressure atomizing burnersCentrifugal or rotary cup burnersAir atomizing burners

Back 370

Atmospheric burners

Front 371

(4-091-2.05) When a greater than normal amount of combustible mixture is ignited, the result may be:A boiler explosion.A puff-back.A negative furnace pressure.A too rapid boiler warm-up.Liquid fuel entering the furnace.

Back 371

A puff-back.

Front 372

(4-091-2.02) The pressure range for pressure-atomizing burners fired with light fuel oil is approximately:50 to 100 kPa150 to 250 kPa300 to 550 kPa550 to 700 kPa700 to 850 kPa

Back 372

550 to 700 kPa

Front 373

(4-091-1.09) The compressed air used as atomizing air in the air atomizing oil burner is also called:Secondary airPrimary airPre-mixed airCombustion airPost-compressed air

Back 373

Primary air

Front 374

(4-092-1.17) When an atmospheric gas fired burner is burning fuel properly:It will have a blue, non-luminous flame.The furnace will pulsate.There will be no turbulence.It will have a long bright yellow flame.It will have perfect combustion.

Back 374

It will have a blue, non-luminous flame.

Front 375

(4-092-1.05) One of the advantages of using natural gas as a fuel in a boiler is:No storage space is requiredLow costAbundance in suppliesPortabilityNo standby fuel is necessary

Back 375

No storage space is required

Front 376

(4-092-1.15) The Venturi tube in the atmospheric burner mixing head has a:Gradually decreasing cross-sectional area.Gradually increasing cross-sectional area.Uniform cross-section throughout.Sharply increasing cross-sectional area.Series of internal ridges, to promote mixing.

Back 376

Gradually increasing cross-sectional area.

Front 377

(4-092-2.02) Large capacity burners:Require high flow on ignition.Are very safe relative to puff-back.Require only a small pilot flame.Should have minimum flow on ignition.Are too hazardous and not recommended.

Back 377

Should have minimum flow on ignition.

Front 378

(4-092-1.16) An intermittent pilot:Lights the main flame then extinguishes.Must be manually ignited.Lights the main flame and remains on until the main flame is extinguished.Remains on after the main flame extinguishes.Lights a pilot flame then extinguishes.

Back 378

Lights the main flame and remains on until the main flame is extinguished.

Front 379

(4-092-1.08) Atmospheric burners are used for:Gas stoves, hot water heaters, heating furnaces and many heating boilers.Ring type burners.Coal firing.Lowering the relative humidity in the combustion air.Preheating the combustion air.

Back 379

Gas stoves, hot water heaters, heating furnaces and many heating boilers.

Front 380

(4-092-1.12) A refractory burner disadvantage is:High cost due to complexityToo much fuel preheatLow radiant heatLow combustion efficiencyOverheating of boiler metal

Back 380

High cost due to complexity

Front 381

(4-092-1.07) If the power is cut off to an automatic gas valve, the valve will:Close slowlyClose immediatelyDe-pressurize the gas trainChatterOpen widely

Back 381

Close immediately

Front 382

(4-092-1.10) An atmospheric premix burner has air entering around the flame that is termed:Primary airSecondary airAtomizing airCombustion airTertiary air

Back 382

Secondary air

Front 383

(4-092-1.09) The main function of a gas burner is:Atomization of the fuel.A source of ignition.Provide thorough mixing of the fuel and air.Regulation of the fuel flow.Air flow control.

Back 383

Provide thorough mixing of the fuel and air.

Front 384

(4-093-1.02) According to code, the scale of a pressure gauge for a steam heating boiler shall be graduated between:100 to 300 kPa200 to 414 kPa200 to 300 kPa125 to 325 kPa230 to 414 kPa

Back 384

200 to 414 kPa

Front 385

(4-093-1.09) An indication of a pressure gauge not performing properly is:The needle fluctuating.The needle not returning to zero when gauge is depressured.The safety valve popping when gauge reads normal.A reading that is not the same as some other gauge.A dial that rotates.

Back 385

The needle not returning to zero when gauge is depressured.

Front 386

(4-093-2.02) When the steam outlet of a boiler is 51mm or larger, the boiler steam outlet stop valve should be a:Non-rising stem globe valveRising spindle gate or globe valveNon-rising spindle gate valveRising spindle plug valveMotorized butterfly valve

Back 386

Rising spindle gate or globe valve

Front 387

(4-093-2.12) The feedwater pipe before entering the boiler must contain:A check valve with a stop valve between the check valve and the boiler.A check valve between the stop valve and the boiler.A stop valve only.Two stop valves.A quick and slow opening stop valve.

Back 387

A check valve with a stop valve between the check valve and the boiler.

Front 388

(4-093-2.08) A boiler feedwater stop valve:Should never be used to control water level.Is used to isolate the deaerator.Must be a globe valve.Should be located close to the feedwater pump.May be a globe valve, provided water enters below the disc.

Back 388

May be a globe valve, provided water enters below the disc.

Front 389

(4-093-i.02) All boiler fittings not properly or clearly identified should be:Rejected.Used for low pressure services only.First approved for use by the boiler inspector.Acceptable for most powerhouse applications.Sent back to the manufacturer for proper identification.

Back 389

Rejected.

Front 390

(4-093-1.07) Which of the following units would the pressure gauge on a steam boiler likely use?PascalsPascals per square metreKilograms per square centimeterKilograms per hourKilopascals

Back 390

Kilopascals

Front 391

(4-093-2.04) Boiler outlet valves are usually:Gate valves because of their low resistance to flow.Gate valves because of their ability to control flow.Globe valves because of their throttling capability.Globe valves because of their low flow resistance.Installed in tandem.

Back 391

Gate valves because of their low resistance to flow.

Front 392

(4-093-2.09) An outside screw and yoke valve:Must be a gate valveReadily shows its operating positionIs difficult to lubricateRequires no packingHas a non-rising stem

Back 392

Readily shows its operating position

Front 393

(4-093-2.01) One purpose of the small valve on top of the shell or the water column on most boilers is to:Signal when the boiler is full of water.Allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum.Allow water to escape before the steam stop valve is opened during the warm-up period.Allow air to escape from the boiler when the boiler is being filled with water.Allow air into the boiler when the boiler is being filled with water.

Back 393

Allow air to escape from the boiler when the boiler is being filled with water.

Front 394

(4-094-2.03) If a hot-water heating boiler has an automatic fill valve, and is requiring a lot of makeup water, this may indicate:The expansion tank is empty.There is probably a leak in the system.There has been a drastic change in the water quality.The return pumps are not working.The flow meter is not working properly.

Back 394

There is probably a leak in the system

Front 395

(4-094-1.13) The pressure relief valve on a hot water boiler:Should be installed on the boiler or close to it.Can be installed anywhere in the system.Must be at least 51 mm pipe size.Does not require annual checking or testing.Can be installed with an isolation valve.

Back 395

Should be installed on the boiler or close to it.

Front 396

(4-094-1.17) The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than _____ times the maximum allowable working pressure.0.511.522.5

Back 396

1.5

Front 397

(4-094-1.05) Hot water heating boilers have stop valves in their supply and return piping:To allow for better warm ups.To prevent water from entering another in-service unit.So that each boiler can have separate water treatment.So that the boiler can be drained without draining the system.To permit annual maintenance.

Back 397

So that the boiler can be drained without draining the system

Front 398

(4-094-1.22) The entrained air in a hot water heating system is directed to the:Relief valveBoilerRadiator ventsExpansion tankAtmosphere

Back 398

Expansion tank

Front 399

(4-094-1.19) The temperature indicator of a hot water boiler should indicate water temperature:In the expansion tankMidway through the systemAt the boiler outletIn the boiler

Back 399

At the boiler outlet

Front 400

(4-094-1.07) Boiler stop valves shall be:Always of the outside screw and yoke design.Globe valves.Identified with durable tags.Installed on horizontal piping only.Throttled during operation.

Back 400

Identified with durable tags.

Front 401

(4-094-1.21) A hot water boiler is protected from over pressure by means of:A temperature relief valveA high limit pressure controlAn expansion tankAn overflow tankA safety relief valve

Back 401

A safety relief valve

Front 402

(4-094-1.09) Open type expansion tanks:Must be located below the heating system.Must be located outdoors.Are used with large hot water boilers only.Must be located above the highest point of the piping system.Are used with small hot water boilers only.

Back 402

Must be located above the highest point of the piping system.

Front 403

(4-094-1.16) When too much air has been absorbed by water in the expansion tank of a closed system, the tank must be:Attached to an air separatorFilledRemovedDrainedReplaced

Back 403

Drained

Front 404

(4-095-3.04) The most important rule in safe operation of a steam heating boiler is:Operate the burner properly.Keep the water level in the boiler at the proper level.Maintain the proper operation of automatic controls.Maintain the correct level in the altitude gauge.Ensure air is kept out of the system.

Back 404

Keep the water level in the boiler at the proper level.

Front 405

(4-095-1.06) It is vitally important to slowly heat up a cold boiler to prevent:Smoky flue gasUneven expansionEven expansionLow efficiencyCavitation in the boiler feedwater pump

Back 405

Uneven expansion

Front 406

(4-095-1.02) Before starting up a new boiler or one that has been out of service the following must be ensured:The manufacturerThe boiler has a valid inspection certificate.The fuel is shut off.The boiler control is in the off position.The boiler is cold.

Back 406

The boiler has a valid inspection certificate

Front 407

(4-095-1.03) If your low pressure steam boiler was in service and you found that there was no water level showing in the gauge glass, your first action would be to:Lift the safety valve try lever.Cut off the fuel and air to the furnace.Start the standby feed pump.Send for the Boiler Inspector.Call a reliable plumber.

Back 407

Cut off the fuel and air to the furnace.

Front 408

(4-095-1.04) During the warm up period of a heating boiler, the main burner goes out. The operator should:Shut down the boiler immediately purge the boiler and restart it.Shut down the boiler, close the fuel valves and determine the cause of the problem.Try to re-light the burner immediately.Check the altitude gage to ensure there is enough water in the system.Clean the burner, purge the boiler and restart it.

Back 408

Shut down the boiler, close the fuel valves and determine the cause of the problem.

Front 409

(4-095-1.07) While warming up an additional hot water heating boiler in preparation to put into service with other boilers, which of the following is true?Stop valves in the supply and return lines are both closed.Supply valve is open slightly and the return line is closed.Supply and return lines are open.Supply and return line valves are both open slightly.Boiler must be isolated from the expansion tank.

Back 409

Stop valves in the supply and return lines are both closed.

Front 410

(4-095-3.01) The most important rule in safe operation of steam boilers is to:Watch the steam pressure.Not overheat the boiler.Ensure an adequate air supply.Ensure a fuel supply.Keep the correct water level.

Back 410

Keep the correct water level.

Front 411

(4-095-3.02) Rust in the gauge glass is an indication that:The boiler should be blown down.Raw water is leaking into the boiler.The copper and brass seats of the valves are deteriorating.Corrosion is occurring in the system.It is time to add boiler chemicals.

Back 411

Corrosion is occurring in the system

Front 412

(4-095-3.05) The most efficient way to keep oxygen out of the boiler water system is to:Add sufficient oxygen scavenger.Keep make-up water to a minimum.Operate the deaerator at a higher pressure.Increase boiler blowoff.Maintain a higher pH in the boiler water.

Back 412

Keep make-up water to a minimum.

Front 413

(4-095-3.03) How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber?DailyMonthlySemi-annuallyAnnuallyBi-weekly

Back 413

Daily

Front 414

(4-097-i.02) In all systems, the horizontal steam supply pipes between boiler and heating units are called the:MainsRisersBanksBranchesDowncomers

Back 414

Mains

Front 415

(4-102-1.03) One of the advantages of a common exhaust duct system used for ventilation in a large building is:No fan to maintain.The building can be maintained at a slight negative pressure at all times.Only one fan to maintain.Windows can be eliminated.No power is required.

Back 415

Only one fan to maintain.

Front 416

(4-098-3.02) One of the advantages of the radiant panel hot water heating system over the conventional heating system is:Less piping is needed.Low water flow resistance.Low in cost.Ease of repair of heating coils.Even heat distribution throughout the rooms.

Back 416

Even heat distribution throughout the rooms.

Front 417

(4-098-1.03) One of the disadvantages of the gravity hot water system is:The water temperature must be very high to compensate for heat losses.Piping used must be rated for high temperature services.There is a slow response to changes in heat demand.The maximum water temperature is limited to approximately 100°C.High maintenance.

Back 417

There is a slow response to changes in heat demand.

Front 418

(4-102-1.04) In a mechanical air intake, natural exhaust ventilation system, the pressure in the building is:Well below atmospheric pressure.Slightly below atmospheric pressure.At atmospheric pressure.Slightly above atmospheric pressure.Well above atmospheric pressure.

Back 418

Slightly above atmospheric pressure.

Front 419

(4-096-1.05) In fin coil type heaters, individual room temperature is controlled by:SwitchesAutomatic valvesDampersAir relaysSupply ducts

Back 419

Dampers

Front 420

(4-096-1.02) Unit heaters differ from convectors in that they use _____ to increase heat transfer.Metal finsNatural circulationBlowersCopper tubesBrass tubes

Back 420

Blowers

Front 421

(4-099-1.12) Special diverter fittings are required in the one-pipe hot water systems to:Divert air from each convector.Ensure condensate flow to the boiler.Divert water from the condensate tank to the boiler.Ensure an adequate flow of water through each convector.Divert airflow from the boiler to the expansion tank.

Back 421

Ensure an adequate flow of water through each convector.

Front 422

(4-101-2.03) The warm air outlets in a warm air heating system should always be located along the:Inside walls of the rooms at or near the floor level.Outside walls of the rooms on or near the ceiling and preferably over the windows.Inside walls of the rooms near the ceiling.Outside walls of the rooms at or near the floor level and preferably under the windows.North-facing walls.

Back 422

Outside walls of the rooms at or near the floor level and preferably under the windows

Front 423

(4-102-3.07) Electrostatic filters are highly efficient in the removal of:OdoursFine dust, smoke, and fumesBacteria and sporesLintMists and fogs

Back 423

Fine dust, smoke, and fumes

Front 424

4-096-1.06) Unit ventilators are:Ceiling suspended unit heatersBaseboard type heatersCabinet type heatersCeiling mounted unit heatersFloor radiators

Back 424

Cabinet type heaters

Front 425

(4-101-1.02) An electronic filter is also known as:An ionic filterA HEPA filterA static filterAn air-purifierAn electrostatic filter

Back 425

An electrostatic filter

Front 426

(4-103-2.01) Infrared heaters are used in:TheatersLecture hallsLibrariesSkating rinksOffices

Back 426

Skating rinks

Front 427

(4-103-2.05) The quartz lamp heating element will respond:InstantaneouslyIn a few secondsIn about one minuteIn about thirty secondsIn about three minutes

Back 427

In a few seconds

Front 428

(4-097-1.05) In the two, pipe variable vacuum steam heating system, the steam temperature can be varied from:200°C to as low as 100°C150°C to as low as 100°C150°C to as low as 55°C,105°C to as low as 55°C"105°C to as low as 45°C

Back 428

105°C to as low as 45°C

Front 429

(4-099-1.06) To regulate the flow of water to a zone circuit a:Flow control valve is usedDiverter fitting is usedGate valve is usedPressure-reducing valve is usedBalancing valve is used

Back 429

Balancing valve is used

Front 430

(4-097-1.08) When a single main is used to carry both the steam supply from the boiler to the radiators and the steam condensate from the radiators back to the boiler, the system is called a one pipe:Condensate return systemGravity return systemReturn trap systemVacuum pump systemVariable vacuum system

Back 430

Gravity return system

Front 431

(4-099-1.04) To prevent corrosion in the expansion tank, it is sometimes filled with:NitrogenAirOxygenHeliumSodium Sulfite

Back 431

Nitrogen

Front 432

(4-097-2.03) After a steam heating system has been operating for some time, you notice that some parts of the heating system are still cold. Which one of the following could be the cause of this?Air is trapped in the affected sections.Boiler water pressure too low.Boiler water temperature too low.Steam does not contain enough heat.Condensate temperature too low.

Back 432

Air is trapped in the affected sections.

Front 433

(4-100-3.01) One of the biggest heat losses in the warm air furnaces and space heaters is:In the combustion chamberThe flue gasesPoor combustion designHigh combustion air temperaturePoor air/fuel mixtures

Back 433

The flue gases