Fy14 Ut Basic Chapter 11 Heating Systems

Front 1

11-1. What is the range of the Fahrenheit thermometer between the freezing point and the boiling point? 1. 180° 2. 190° 3. 200° 4. 210°

Back 1

1. 180°

Front 2

11-2. The sum of sensible heat plus latent heat is the definition of what term? 1. Specific heat 2. Total heat 3. Cumulative heat 4. Super heat

Back 2

2. Total heat

Front 3

11-3. What principle is the transfer of heat by means of mediums such as water, air, and steam? 1. Conduction 2. Radiation 3. Convection 4. Immersion

Back 3

3. Convection

Front 4

11-4. What principle is the transfer of heat through space? 1. Immersion 2. Conduction 3. Convection 4. Radiation

Back 4

4. Radiation

Front 5

11-5. What fuels are most commonly used with heating equipment? 1. Gas and petroleum 2. Coal and gas 3. Wood and petroleum 4. Steam and gas

Back 5

1. Gas and petroleum

Front 6

11-6. What is the major element present in natural gas? 1. Ethane 2. Methane 3. Nitrogen 4. Carbon dioxide

Back 6

2. Methane

Front 7

11-7. Butane and propane are part of what group of liquefied gases? 1. Natural 2. Manufactured 3. Liquefied petroleum 4. Chemically altered

Back 7

3. Liquefied petroleum

Front 8

11-8. How many types of unit heaters are currently utilized in the Seabee community? 1) 1 2) 2 3) 3 4) 4

Back 8

3) 3

Front 9

11-9. Unit heaters rated for less than 50,000 BTUs per hour are designated to operate on what systems? 1. Low pressure steam 2. Low temperature hot water 3. High temperature steam 4. Fuel oil burning

Back 9

1. Low pressure steam

Front 10

11-10. One kilowatt is equal to how many BTUs per hour? 1) 3355 2) 3415 3) 3560 4) 3745

Back 10

2) 3415

Front 11

11-11. Why is the vented gas heater more satisfactory than the unvented type? 1. Less expensive installation 2. Less preventive maintenance required 3. Less danger of carbon monoxide poisoning 4. Less accumulation of back soot

Back 11

3. Less danger of carbon monoxide poisoning

Front 12

11-12. The burning of 1,000 cubic feet of natural gas will produce approximately how many gallons of water? 1) 6 2) 8 3) 10 4) 12

Back 12

4) 12

Front 13

11-13. What grade of fuel oil is required in oil-fired space heaters? 1. Light 2. Medium 3. Heavy 4. Super heavy

Back 13

1. Light

Front 14

11-14. A perforated sleeve burner with its circular fuel vaporizing grooves burns what color flame? 1. Cherry red 2. Blue 3. Orange 4. Red

Back 14

2. Blue

Front 15

11-15. What controls the flow of oil in the pot type and perforated sleeve burners? 1. Primary control unit 2. Fuel allocation diffuser 3. Float-operated metering valve 4. Restrictor orifices

Back 15

3. Float-operated metering valve

Front 16

11-16. A chimney top is required to be how many feet above the highest point of a building? 1) 2 2) 3 3) 5 4) 6

Back 16

2) 3

Front 17

11-17. What type of piping or tubing is used in oil supply systems to the burners? 1. Copper 2. Brass 3. Cast iron 4. Steel

Back 17

1. Copper

Front 18

11-18. Warm-air systems are identified as what types? 1. Forced-air and high temperature 2. Gravity and forced-air 3. Oil fed and gas fed 4. Vented and unvented

Back 18

2. Gravity and forced-air

Front 19

11-19.What part does the plenum join up with in a furnace? 1. Draft diverter 2. Exhaust piping 3. Main trunk duct 4. Intake valve manifold

Back 19

3. Main trunk duct

Front 20

11-20. What is the result of improperly placed supply diffusers? 1. Hot floors 2. Excessive condensation 3. Improper air intake 4. Air stratification

Back 20

4. Air stratification

Front 21

11-21. (True or False) In an individual duct system, each duct is connected directly to the furnace plenum.

Back 21

1. True

Front 22

11-22. What is a register temperature range of a forced warm-air system? 1. 110° to 140° 2. 150° to 180° 3. 180° to 210° 4. 220° to 240°

Back 22

2. 150° to 180°

Front 23

11-23. What is the most commonly used airflow design associated with a gas- fired furnace? 1. Horizontal 2. Vertical 3. Upflow highboy 4. Lowboy

Back 23

3. Upflow highboy

Front 24

11-24. Duct furnaces are mounted in a duct system where air circulation is provided by what? 1. Furnace blower 2. Internal fan 3. Atmosphere 4. External fan

Back 24

4. External fan

Front 25

11-25. Along with the return-air compartment and warm-air compartment, what other compartment comprises the gas-fired furnace? 1. Combustion air and fuel 2. Supply-air 3. Hot-air 4. Combustion and return

Back 25

1. Combustion air and fuel

Front 26

11-26. What type of blower is installed in a gas-fired furnace? 1. Rotary 2. Centrifugal 3. Jet 4. Displacement

Back 26

2. Centrifugal

Front 27

11-27. Which piece of equipment is NOT part of the gas burner control? 1. Gas pressure regulator 2. Humidifier 3. Manual gas cock 4. Heat exchanger

Back 27

2. Humidifier

Front 28

11-28. What piece of equipment maintains the desired pressure in the burner as long as the gas main pressure is above the desired pressure? 1. Diaphragm valve 2. Thermocouple control relay 3. Solenoid gas valve 4. Gas pressure regulator

Back 28

4. Gas pressure regulator

Front 29

11-29. What position does the solenoid gas valve revert to upon a current failure? 1. Open 2. Shut 3. As is 4. Bypass

Back 29

2. Shut

Front 30

11-30. How does the design of a recycling solenoid gas valve differ from a standard solenoid gas valve? 1. Standard solenoid valves only ports a set fuel amount. 2. Allows the valve to switch to manual operation during a power failure. 3. Recycling solenoid gas valve maintains system pressure. 4. Allows for quieter operation.

Back 30

2. Allows the valve to switch to manual operation during a power failure.

Front 31

11-31. What device is used to produce the electrical current used to operate gas valves? 1. Thermoresistors 2. Pilot light 3. Thermopiles 4. Diaphragm valve

Back 31

3. Thermopiles

Front 32

11-32. What device shuts off the gas supply when the temperature inside the heating unit becomes excessive? 1. Recycling solenoid gas valve 2. Heat exchanger 3. Thermocouple control relay 4. Limit control

Back 32

4. Limit control

Front 33

11-33. What device is used to reduce updrafts that are detrimental to pilot or burner operation? 1. Diverter 2. Limit control 3. Thermopiles 4. Diaphragm valves

Back 33

1. Diverter

Front 34

11-34. What is the voltage produced by the step-up transformer used in a gas fired furnace? 1) 5000 2) 10000 3) 15000 4) 20000

Back 34

2) 10000

Front 35

11-35. What piece of equipment runs the fuel unit of a gas-fired furnace? 1. Ignition electrodes 2. Horizontal rotary unit 3. Blower motor shaft 4. High pressure gun relay

Back 35

3. Blower motor shaft

Front 36

11-36. Which grade of fuel oil is used in a gas-fired furnace? 1. Low 2. Medium 3. High 4. Super high

Back 36

3. High

Front 37

11-37. What device closes the ignition circuits when the thermostat calls for more heat? 1. Primary control 2. Bimetallic strip 3. Limit control 4. Temperature-responsive relay

Back 37

1. Primary control

Front 38

11-38. (True or False) The limit control is a device that responds to changes in steam pressure in a steam-heating system.

Back 38

1. True

Front 39

11-39. What type of element is used in a vapor-tension device? 1. High pressure steam 2. Water temperature 3. Highly volatile liquid 4. Low discharge current

Back 39

3. Highly volatile liquid

Front 40

11-40. Other than the snap-action electrical switch, which other electrical switch is often utilized? 1. Current seeking 2. Float 3. Transducer 4. Mercury

Back 40

4. Mercury

Front 41

11-41. What is the nerve center of the heating-control system? 1. Thermostat 2. Primary control 3. Gas regulator valve 4. Step-up transformer

Back 41

1. Thermostat

Front 42

11-42. How far up on the wall should a thermostat be placed, in feet? 1) 3 1/2 2) 4 1/2 3) 5 1/2 4) 6 1/2

Back 42

2) 4 1/2

Front 43

11-43. (True or False) Gas-fired and oil-fired forced-air units, which have the blower below the heating element or combustion chamber, should be set on masonry at least 4 inches thick.

Back 43

2. False

Front 44

11-44. What is the clearance requirement, in feet, of a furnace from wood or other combustible material? 1) 12 2) 14 3) 16 4) 18

Back 44

4) 18

Front 45

11-45. One inch of free-air area is required for how many BTUs per hour of furnace input rating? 1) 1000 2) 2000 3) 3000 4) 4000

Back 45

1) 1000

Front 46

11-46. What type of material and diameter piping or tubing are required from the oil tank or valve to the burner? 1. Copper, 1/4 inch 2. Copper, 1/2 inch 3. Cast iron, 1/4 inch 4. Cast iron, 1/2 inch

Back 46

2. Copper, 1/2 inch

Front 47

11-47. What size is recommended for all vent lines used in furnace installations? 1. 1 inch 2. 1 1/4 inch 3. 1 1/2 inch 4. 1 3/4 inch

Back 47

3. 1 1/2 inch

Front 48

11-48. Why are kerosene, diesel oils, and commercial oils of Grades Nos. 1 and 2 suitable for furnace usage? 1. They are easy to transport via aircraft. 2. They are easier to store than higher grades. 3. Their procurement costs are low. 4. They vaporize at relatively low temperatures.

Back 48

4. They vaporize at relatively low temperatures.

Front 49

11-49. (True or False) Burners using air as the atomizing medium are designed for three air pressure ranges.

Back 49

1. True

Front 50

11-50. At what speed, in rpm, does a cylindrical cup use in a horizontal rotary-cup burner rotate? 1) 3300 2) 3450 3) 3575 4) 3700

Back 50

2) 3450

Front 51

11-51. What is used to remove the air from a burner prior to starting? 1. Regulator 2. Ventilator 3. Petcock 4. Bypass

Back 51

3. Petcock

Front 52

11-52. Which is NOT a cause for a flame that is raw and stingy in a oil burner? 1. Partly clogged nozzle 2. Air in the pump 3. Too large an opening in air adjustment 4. Improper draft

Back 52

4. Improper draft

Front 53

11-53. After the burner flame and draft are properly adjusted, a flue-gas analysis should show a CO2 content of approximately what percent? 1) 10 2) 11 3) 12 4) 13

Back 53

1) 10

Front 54

11-54. If the furnace is large enough and the burner has been set for correct oil flow and minimum amount of air, stack temperature should not exceed how many degrees? 1) 550 2) 600 3) 650 4) 675

Back 54

2) 600

Front 55

11-55. The stack thermometer is used to determine the temperature of gases in what piece of equipment? 1. Combustion chamber 2. Furnace outlet 3. Smoke pipe 4. Draft regulator

Back 55

3. Smoke pipe

Front 56

11-56. What is a possible problem in an oil pump, if you have no oil flow at the nozzle? 1. Blown seal 2. Air leak in intake line 3. Loose plugs or fittings 4. Bad coupling alignment

Back 56

2. Air leak in intake line

Front 57

11-57. What is the disadvantage of using cast iron hot-water heating boilers? 1. Sections cracking 2. Low heat retention 3. Delayed start-up time 4. Scarcity of repair parts

Back 57

1. Sections cracking

Front 58

11-58. How many inches above a finished floor should a low-temperature hot water boiler be? 1) 1 2) 2 3) 3 4) 4

Back 58

2) 2

Front 59

11-59. Where is the pressure-relief valve located on a boiler used in a low- temperature hot water system? 1. Bottom of boiler 2. Right side of vent valve 3. Top of boiler 4. Left side of vent valve

Back 59

3. Top of boiler

Front 60

11-60. What is another name for the airflow switch used in a low-temperature hot water system? 1. Control valve 2. Extender 3. Draft 4. Sail

Back 60

4. Sail

Front 61

11-61. (True or False) A one-pipe, open-tank gravity distribution system consists of a single pipe that carries hot water to all of the radiators and then returns it back to the boiler.

Back 61

1. True

Front 62

11-62. The amount of temperature drop between the beginning and the end of the line 1. Ambient air pressure 2. Heating load 3. Boiler start-up temperature 4. Temperature stabilization

Back 62

2. Heating load

Front 63

11-63. The relief valve located in a closed pneumatic compression system is set to lift at what water pressure level, in psi? 1) 15 2) 20 3) 25 4) 30

Back 63

4) 30

Front 64

11-64. In the heating of larger installations where more than one building is involved, what type of circulation method is used? 1. Free flow 2. Closed 3. Open 4. Forced

Back 64

4. Forced

Front 65

11-65. Mains and branches are pitched so air in the system is discharged through which device? 1. Radiator 2. Surge tank 3. Pressure regulator 4. Diverter

Back 65

1. Radiator

Front 66

11-66. How many radiator types are you concerned with as a UT? 1) 1 2) 2 3) 3 4) 4

Back 66

2) 2

Front 67

11-67. (True or False) Circulating pumps used in low-temperature hot water distribution systems ensure the positive flow of water regardless of the height of the system or the rise in water temperature.

Back 67

2. False

Front 68

11-68. Where is the reducing valve installed on the boiler? 1. At the outlet port 2. Inside the combustion chamber 3. Below the pressure regulating valve 4. At the same level as top of boiler

Back 68

4. At the same level as top of boiler

Front 69

11-69. Which is a reason why radiators do not heat? 1. Not enough air in the system 2. Insufficient water in the system 3. Clogged fin-tubes 4. Closed radiator valve

Back 69

2. Insufficient water in the system

Front 70

11-70. What is the high temperature range for most military and federal heating plants? 1. 250°F to 350°F 2. 350°F to 450°F 3. 450°F to 550°F 4. 550°F to 650°F

Back 70

2. 350°F to 450°F

Front 71

11-71. Whose permission is needed to install an HTHW plant that operates above 400°F? 1. Base Commanding Officer 2. Crew Supervisor 3. Naval Facilities Engineering Command 4. Officer in Charge

Back 71

3. Naval Facilities Engineering Command

Front 72

11-72. What type of pump is used in an HTHW system? 1. Rotary 2. Jet 3. Submersible 4. Centrifugal

Back 72

4. Centrifugal

Front 73

11-73. Why is an expansion tank required in an HTHW system? 1. To allow for water expansion when heated. 2. To receive excess water run-off from boiler. 3. To allow for excessive condensation to drain. 4. To comply with NACENGCOM directives.

Back 73

1. To allow for water expansion when heated.

Front 74

11-74. What is the optimal pH range for an HTHW system? 1. 7.25 to 9.25 2. 9.3 to 9.9 3. 10.1 to 11.2 4. 12.3 to 15.6

Back 74

2. 9.3 to 9.9

Front 75

11-75. Upon completion of an installation of an HTHW system, the entire system is held under what pressure, in psi, for not less than 24 hours? 1) 300 2) 350 3) 400 4) 450

Back 75

4) 450

Front 76

11-76. Generator tubes utilized in HTHW systems are subjected to an ASME test pressure of what value, in psi? 1) 600 2) 700 3) 800 4) 900

Back 76

4) 900