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109 Cards in this Set
- Front
- Back
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Most low capacity cast iron boilers:
a) cannot be site assembled b) can withstand higher pressures c) will pass through standard size doorways d) are factory assembled as packaged units e) require special foundations |
c) will pass through standard size doorways |
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Sectional cast-iron boiler sections are connected with:
a) push nipples b) modules c) victaulic couplings d) unions e) threaded fittings |
a) push nipples |
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Cast iron sectional boiler sections are held together with:
a) cap bolts b) torque tubes c) pipe unions d) tie rods e) stays |
d) tie rods |
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A cast-iron boiler advantage is:
a) its high factor of brittleness c) its ability to withstand high pressure |
d) the choice of assembly location |
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The steam and water spaces of a cast iron sectional boiler are connected by:
a) tie rods b) tie nipples c) hydraulic jacks d) steel studs e) push nipples |
e) push nipples |
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As far as boiler capacity is concerned, the mechanical designer has which two of the following choices? (Choose the two which apply)
[a] fuel type and cost [b] occupant comfort [c] using one or two large boilers [d] fuel storage requirements [e] connecting multiple smaller boilers in parallel |
[c] using one or two large boilers [e] connecting multiple smaller boilers in parallel |
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The ratio of heat released to heat transferred to boiler water is known as:
a) combustion efficiency b) heating surface efficiency c) boiler efficiency d) section ratio e) enthalpy transfer ratio |
c) boiler efficiency |
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The operation of the burners in a Modular Cast Iron Heating Plant:
a) is continuous b) uses a supply and return header c) is modulated by a PRV d) is controlled by a step controller e) requires no primary air |
d) is controlled by a step controller |
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Where are the cleanout plugs located on a cast iron sectional boiler?
a) in the front section b) on the top of the boiler c) on the bottom of the boiler d) on the front and rear sections e) at the steam outlet |
d) on the front and rear sections |
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Water flow in a cast iron modular boiler is:
a) continuous through all modules b) connected in series c) intermittent, occurring only which the unit is firing d) always vertically upwards e) done without the use of headers or manifolds |
a) continuous through all modules |
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A wetbottom type cast iron sectional boiler:
a) increases the heating surface b) surrounds the furnace entirely c) make water treatment less critical d) support the boiler on concrete piers e) make waterside maintenance easier |
b) surrounds the furnace entirely |
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A cast iron boiler disadvantage is:
a) it is subject to corrosion b) its difficult assembly c) its extremely high cost d) its high ductility e) its pressure limitations |
e) its pressure limitations |
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Outdoor oil storage tanks are graded away from the pump to:
a) increase suction lift b) trap moisture and sediment c) limit head pressure d) assist filling e) provide air entry |
b) trap moisture and sediment |
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An air atomizing compressor is usually:
a) a variable displacement type b) a centrifugal type c) an axial type d) a positive displacement type e) a regenerative type |
d) a positive displacement type |
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Light fuel oil systems, which utilizes pressure atomizing burners, range in pressure of _________ (approximately).
a) 50 to 100 kPa b) 150 to 250 kPa c) 300 to 550 kPa d) 550 to 700 kPa e) 700 to 850 kPa |
d) 550 to 700 kPa |
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The theoretical maximum suction lift for a single stage fuel pump is ______ meters.
a) 4 b) 2 c) 20 d) 10 e) 40 |
a) 4 |
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What are required on all oil storage vessels?
a) pumps b) return lines c) heaters d) air vents e) non-return valves |
d) air vents |
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A modulating pressure atomizer has its return oil flow regulated by:
a) a modulating valve to the burner b) a control valve in the return line c) a solenoid valve in the return line d) a temperature control valve to the burner e) pump speed |
b) a control valve in the return line |
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A multi-burner cluster has secondary and tertiary nozzles ignited by:
a) an igniter spark b) an intermittent piolet flame c) an interrupted pilot d) the primary burner e) a continuous pilot |
d) the primary burner |
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What does a modulating oil burner use in order to match heat demand?
a) a swirler in the nozzle b) a regulating valve in the return c) a system of multiple burners d) a step controller e) a positive displacement pump |
b) a regulating valve in the return |
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The minimum distance from furnace to oil storage is:
a) 7 m b) 5.2 m c) 2.1 m d) 4.7 m e) 0.6 m |
e) 0.6 m |
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In an oil burner with 3 fixed capacity nozzles, the intermediate and high fire burner nozzles have higher capacities than the primary burner nozzle:
a) to give greater firing variations b) to prevent pressure surges c) to prevent ignition puff-backs d) because of the pump being of the positive displacement type e) to allow better boiler warm-ups |
e) to allow better boiler warm-ups
note: the three nozzle burner arrangement makes it possible to warm the boiler up slowly at the lowest firing rate. |
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Before atomization can occur, heavy oils are heated to approximately:
a) 203˚C b) 95˚C c) 115˚C d) 75˚C e) 150˚C |
b) 95˚C |
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The reducing of oil into very small particles is termed:
a) fluidization b) fractionation c) turbulence d) atomization e) distallation |
d) atomization |
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A relief valve is placed on the discharge of a fuel oil pump:
a) because the pump is a dynamic type b) so burner design pressure is not exceeded c) so burner capacity is maintained d) to prevent pump rupture e) to prevent over-firing of the boiler |
b) so burner design pressure is not exceeded |
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Maximum static pressure in a fuel oil line from a fuel tank is approximately:
a) 10 kPa b) 15 kPa c) 80 kPa d) 35 kPa e) 70 kPa |
e) 70 kPa
note: the minimum oil level in the tank should produce no less than 35 kPa |
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What type of pilot lights the main burner and then shuts off?
a) standing b) intermittent c) interrupted d) flameless e) combination |
c) interrupted |
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A very common packaged boiler gas burner is the:
a) ring burner b) non-articulated burner c) post mix atmospheric burner d) mechanical atomizing burner e) cluster nozzle burner |
a) ring burner |
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Larger solenoid type oil and gas valves are usually delayed opening to:
a) avoid valve wear b) prevent puff backs c) allow pressure build up d) increase fuel flow e) prevent back flow |
b) prevent puff backs |
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A refractory burner disadvantage is:
a) high initial cost b) too much fuel preheat c) low radiant heat d) low combustion efficiency e) overheating of boiler metal |
a) high initial cost |
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A solenoid type gas fuel valve:
a) is held closed by fuel pressure b) always opens rapidly c) is held closed by electrical current d) closes slowly e) does not have positive shut-off |
a) is held closed by fuel pressure |
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An atmospheric burner head which is very popular on heating boilers is the:
a) refractory burner b) star burner c) ring burner d) rectangular burner e) ribbon ring burner |
d) rectangular burner |
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An atmospheric burner has air entering around the burner, which is termed:
a) primary air b) secondary air c) atomizing air d) combustion air e) tertiary air |
b) secondary air |
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Atmospheric burners are used for:
a) gas stoves, hot water heaters, heating furnaces b) ring type burners c) coal firing d) lowering the relative humidity in the combustion air e) warming the incoming combustion air |
a) gas stoves, hot water heaters, heating furnaces |
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Diaphragm gas valves use __________ to open the valve.
a) a piston b) gas pressure c) a solenoid d) hydraulic pressure e) air |
b) gas pressure |
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An example of an after-mix burner is the:
a) ring burner b) ribbon burner c) round port burner d) refractory burner e) vane burner |
a) ring burner |
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A hydramotor valve:
a) opens and closes quickly b) is slow to open, quick to close c) uses air as its working medium d) is quick to open, slow to close e) closes slowly |
b) is slow to open, quick to close |
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When a gas fired burner is burning fuel properly:
a) it will have a blue non-luminous flame b) the furnace will pulsate c) there will be no turbulence d) it will have a long bright yellow flame e) the induced draft fan can be shut off |
a) it will have a blue non-luminous flame |
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Larger solenoid type oil and gas valves usually delayed opening to:
a) avoid valve wear b) prevent puff backs c) allow pressure build up d) increase fuel flow e) prevent back flow |
b) prevent puff backs |
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What type of pilot lights the main burner and then shuts off?
a) standing b) intermittent c) interrupted d) flameless e) combination |
c) interrupted |
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A solenoid type gas fuel valve:
a) is held closed by fuel pressure b) always opens rapidly c) is held closed by electrical current d) closes slowly e) does not have positive shut-off |
a) is held closed by fuel pressure |
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An intermittent pilot:
a) lights the main flame then extinguishes b) must be manually lit c) lights the main flame and remains on with it d) remains on when the main flame extinguishes e) lights a pilot flame then extinguishes |
c) lights the main flame and remains on with it |
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What type of gas valve incorporates a relay coil and gas bleed port?
a) a motorized gas valve b) a solenoid gas valve c) a diaphragm gas valve d) a hydraulic gas valve e) a magnetic gas valve |
c) a diaphragm gas valve |
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A continuous pilot is also knows as a/an ________ pilot.
a) interrupted b) standing c) burning d) limitless e) non-period |
b) standing |
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diaphragm gas valves use ________ to open the valve.
a) a piston b) gas pressure c) a solenoid d) hydraulic pressure e) air |
b) gas pressure |
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A very common packaged boiler gas burner is the:
a) ring burner b) non-articulated burner c) post mix atmospheric burner d) mechanical atomizing burner e) cluster nozzle burner |
a) ring burner |
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The main function of a gas burner is:
a) atomization of the fuel b) source of ignition c) provision of O2 - fuel mixing d) regulation of the fuel flow e) air flow regulation |
c) provision of O2 - fuel mixing |
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The amount of pre-mix air to an atmospheric burner should be:
a) 10 to 12% b) 5 to 8% c) 20 to 30% d) 30 to 40% e) 40 to 50% |
d) 30 to 40% |
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When using a dead weight tester, the effect of friction:
a. is reduced by rotating the platform b. will cause a higher than desired reading c. is negligible d. is eliminated with a lubricant e. is compensated for mathematically |
a. is reduced by rotating the platform |
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On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to:
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b. allow boiler isolation from the system |
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What fitting is required in the feed water line adjacent to the boiler before the stop valve?
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b. check valve |
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The scales on a pressure gauge for a steam heating heating boiler shall be graduated between one of the following:
a. from 210 to 435 kpa b. from 210 to 420 kpa c. from 200 to 414 kpa d. from 220 to 440 kpa e. from 230 to 420 kpa |
c. from 200 to 414 kpa |
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Boiler blowdown lines have a specific size range based on
a. water impurities |
c. boiler capacity |
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An inspector's test connection:
a. should be located upstream of a siphon b. should be of 12.7 NPT size c. is required on all boilers d. shall be located adjacent to the gauge e. is not mandatory on LP boilers |
e. is not mandatory on LP boilers |
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The working medium in the dead weight tester is:
a. air b. water c. glycol d. medium weight oil e. alcohol |
d. medium weight oil |
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When installing a siphon it:
a. must be perpendicular to the piping b. must be dry c. should be downstream of an inspector's test connection d. should be first filled with water e. shall be as close to the boiler as possible |
d. should be first filled with water |
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A boiler feedwater stop valve
a. should never be used to control water level |
e. is used to isolate the feedwater line |
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A steam pressure gauge may be graduated in:
a. micropascals b. pascals per square meters c. kilograms per square centimeters d. kilograms per hours e. kilopascals |
e. kilopascals |
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Boiler blowdown piping
a. can be reduced in size after the blowdown valves |
b. must be full size to the point of discharge |
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An outside screw and yoke valve
a. is always a gate valve |
b. readily shows its operating position |
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A steam boiler is blown down in order to
a. clean the soot and carbon out of the firebox and tubes |
c. discharge sediment and scale forming matter from the boiler |
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An essential fitting between the boiler and the steam pressure gauge is:
a. a check valve b. a gate valve c. a gauge glass d. a siphon e. a steam trap |
d. a siphon |
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When the steam outlet is 51mm pipe or larger, it is recommended that a ______ valve with a rising stem be used.
a. OS&Y b. double balanced c. globe d. non-return e. butterfly |
a. OS&Y (Outside Screw and Yoke) |
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On low pressure steam boilers, the boiler outlet valves are usually:
a. gate valves because of their low resistance to flow |
a. gate valves because of their low resistance to flow |
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A stop valve is fitted between the boiler and the feed water check valve:
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b. for isolation and to provide a positive shut-off |
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An expansion tank is used to
a. store steam |
c. allow for the expansion of the water |
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Hot water boilers have stop valves in their inlet and outlet piping
a. to allow for better warm-ups |
e. so that the boiler can be drained without draining the system |
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For hot water boilers operating up to 414 kPa, a pressure relief valve opening pressure variation may be as much as:
a) 20 kPa |
a) 20 kPa |
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In a hot water heating system, the closed type expansion tank should be
a. kept full of water |
c. partly filled with water |
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An automatic fill valve:
a. will maintain maximum system pressure at all times |
c. is not mandatory |
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Boiler stop valves shall be
a. of the OS&Y type |
c. identified with durable tags |
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During warm-up of a cold hot water boiler excessive pressure build-up is prevented by
a. a very slow warm-up |
b. an expansion tank |
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Hot water heating boilers must be equipped with a:
a. thermometer |
a. thermometer |
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In a closed expansion tank system an air separator
a. removes air from the system |
d. directs air into the expansion tank |
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In a hot water boiler heating system when the system is cold:
a. the auto fill valve will maintain a system minimum pressure |
a. the auto fill valve will maintain a system minimum pressure |
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When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature
a) the boiler expands |
b) the pressure build-up opens the safety relief valve |
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How are stop valves, which are used on steam outlet connections of heating boilers, identified?
a. they are stamped |
e. with metal tags |
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A pressure or altitude gage for a hot water boiler
a. must be equipped with a siphon |
c. does not require a siphon |
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In hot water heating boiler systems, the gauge glasses are normally fitted to the:
a. boiler drum |
e. expansion tank |
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The following fittings are desired but not required on hot water heating boilers. (Choose all that apply)
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[b] air separator |
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It is very important that boilers should be
a. warmed up quickly to prevent condensation |
d. warmed up slowly to prevent thermal shock |
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At what pressure pressure should a hot water heating boiler operate if the relief valve is set to 750 kPa?
a. 681 kPa b. 188 kPa c. 121 kPa d. 562 kPa e. 712 Kpa |
d. 562 kPa
note: The safety relief valve set pressure and the boiler operating pressure is kept to a minimum of 69kPa or 25% of the relief valve setting, whichever is greater |
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According to the Alberta Safety Codes Act, in a low pressure steam boiler, the pressure must be no higher than:
a. 158.7 kPa b. 207 kPa c. 103 kPa d. 109 kPa e. 69 kPa |
c. 103 kPa |
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Thermal shock to boilers can be reduced by: (Choose all that apply)
[a] warming up boilers slowly [f] leave the tube sheets open to atmosphere |
[a] warming up boilers slowly |
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Rust in the gauge glass is an indication that:
a. suspended solids are high b. raw water is leaking into the boiler c. the copper and brass seats of the valves are deteriorating d. corrosion is occurring in the system e. total dissolved solids in the boiler are high |
d. corrosion is occurring in the system |
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Before starting up a new boiler or one that has been out of service, the first item that should be checked is:
b. the temp limit settings c. the circulator pump d. the inspection certificate e. the fuel supply |
d. the inspection certificate |
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During the cold start-up of a boiler, slight smoking may occur in _________-fired furnaces.
a. electrically b. gas c. oil d. externally e. internally |
c. oil |
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In hot water boiler operation the maximum operating temperature should never exceed
a. 100 degrees C b. 121 degrees C |
b. 121 degrees C |
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How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber?
a) daily |
a) daily |
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At what pressure should a hot water heating boiler operate if the relief valve is set to 200 kPa?
a. 150 kPa b. 25 kPa c. 101 kPa d. 131 kPa e. 195 kPa |
d. 131 kPa
note: The safety relief valve set pressure and the boiler operating pressure is kept to a minimum of 69kPa or 25% of the relief valve setting, whichever is greater |
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If a hot water heating system is slightly low on water and the boiler is in the lowest part of the system, then the:
a. boiler will cycle more frequently |
b. upper floors will begin to lose heat |
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In a steam heating system, if a boiler loses _____ of water per month, this indicates there is a leak in the system.
a. 75 mm |
a. 75 mm |
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If during the warm-up period of a heating boiler, the main burner goes out. The operator should:
a. shut down the boiler immediately, purge the boiler, and restart it. |
b. shut down the boiler, close the fuel valves, and |
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If there is any question as to the accuracy indicated by a gauge glass and the true level cannot be determined:
a. the boiler should be fired harder to raise the pressure in the glass, thus forcing out any obstruction in the connections |
b. the boiler should be removed from service and all water level indicating attachments checked |
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The operating pressure of a hot water heating boiler should be:
a) 25% lower than MAWP b) 10% lower than normal pressure c) 25% below the relief valve setting d) 20% above the relief valve setting e) at the relief valve set pressure |
c) 25% below the relief valve setting |
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The temperature indicator of a hot water boiler should indicate water temperature:
a) at the boiler inlet b) in the expansion tank c) midway through the system d) at the boiler outlet e) in the boiler |
d) at the boiler outlet |
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Hydraulic comparators, which are used for testing gauges, rely on the accuracy of the:
a) machined weights b) operators calculations c) master gauge d) cylinder size e) primary cylinder |
c) master gauge |
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A closed expansion tank is usually equipped with:
a) a gauge glass b) a pressure relief valve c) an automatic fill valve d) a circulating pump e) a thermometer |
a) a gauge glass |
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The purpose of the small vent valve or cock located on top of the shell or on top of the water column on most boilers is:
a) to allow water to escape from the boiler when the boiler is being filled with air b) to allow air in to the boiler when the boiler is being filled with water c) to allow water to escape before the steam stop valve is opened during the warm-up period d) to allow air to escape from the boiler as it is being filled with water e) to allow water into the boiler when the boiler is being drained or cooled, preventing the formation of a vacuum |
d) to allow air to escape from the boiler as it is being filled with water |
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The air released from the water in the closed expansion tank type hot water heating system is directed to:
a) the relief valve b) the boiler c) the radiator vents d) the expansion tank e) the atmosphere |
d) the expansion tank |
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The capacity of a constant capacity mechanical atomizer is a function of:
a. orifice size b. pump speed c. pump size d. supply pressure e. oil viscosity |
a. orifice size |
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A fuel filter consists of
a) a cartridge |
c) three main parts
1. Cast-iron top with inlet and outlet openings and vent screws 2. Filter cartridge made of layers of wool felt 3. Steel cap which encloses the cartridge |
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What do electric ignition transformers step up the supply voltage to (approximately)?
a. 100 - 120 volts |
e. 10,000 - 12,000 volts |
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What do all oil-fired boilers require?
a. a fuel pump b. a modulating valve c. high pressure air d. a soot blower e. a preheater
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a. a fuel pump |
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A time delay oil valve:
a. opens when the pump starts |
b. opens 5 - 15 seconds after the igniter has started |
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When heat demand is very low, the Two Fixed Capacity Burner system will:
a. cycle the primary burner |
a. cycle the primary burner
note: The primary nozzle is used for start-up and low demand firing, whereas the secondary nozzle is used in conjunction with the primary nozzle when the heat demand is high.
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The part of an air atomizing burner that imparts a turning motion to the oil is the:
a. swirler b. orifice c. body d. strainer e. spring |
a. swirler |
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The most important rule in safe operation of a steam heating boiler is
a. operate the burner properly |
b. keep the water level in the boiler at the proper level |
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To which of the following oil burners is the oil supplied under high pressure?
a) mechanical atomizing burner b) air atomizing burner c) rotary atomizing burner d) steam atomizing burner e) multi-spud burner |
a) mechanical atomizing burner |
