AC332 Gas Heat

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8. If flue gases are not vented properly, carbon monoxide poisoning could result.

True

False

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11. Liquified petroleum (LP) is heavier than air and can cause suffocation if not handled properly.

True

False

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14. The gas flame will lift off the burner and be noisy if it receives too much primary air.

True

False

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16. In the USA, natural gas suppliers supply gas with a heat content of about 1,050 Btu/cu. ft.

True

False

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18. The proper color of a gas flame is ______.

Sharp all blue

Lazy all blue

Blue with slight orange tips

Lazy with yellow tips

19. A gas furnace designed for use with natural gas can be used with liquified petroleum (LP) with no system modifications.

True

False

20. It is possible for a hydronic system with many zones to operate with one circulation pump.

True

False

21. A tankless domestic water system provides hot water from a coil in the boiler.

True

False

22. Hydronic heat circulators are centrifugal pumps.

True

False

23. If a parallel hydronic system is installed, it may be necessary to bleed air from each of the parallel circuits.

True

False

24. When an oil or gas boiler is used, the water chamber is divided into smaller compartments to increase the surface area on which the heat can act.

True

False

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26. A gas flame will carry electrical energy.

True

False

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28. The orifice is a precisely sized hole in the ______.

Manifold

Spud

Burner tube

Combustion chamber

29. Air in the hot water circulating system will cause ______.

Corrosion

Noise

Flow blockage

All of the above

30. Air in a hydronic system can cause ______.

Reduced water circulation

Increased efficiency

Corrosion

Both a and c

31. A furnace with a vertical air flow through the heat exchanger and the blower compartment beneath the heat exchanger is called a(n) ______.

Upflow

Downflow

Low boy

Horizontal

32. If there is too much primary air, the gas flame can ______.

Get blown out

"lift" off the burner rack

Make noise

Both b and c

33. A condensing gas furnace uses ______ from a condensing type heat exchanger to increase the furnace efficiency.

Sensible heat

Latent heat

Superheat

Subcooling

34. The reason for using zones valves on a hydronic heating system is to ______.

Allow different areas of the structure to maintain different temperatures

Reduce the chance of a water leak

Prevent unused parts of the house from getting warm, and wasting energy

Both a and c

35. Primary air adjusters on atmospheric type gas burners are usually ______.

Butterfly shutters

Sliding sleeves

Spoilers screws

All of the above

36. A limit control on a hot water boiler is need to ______.

Regulate the amount of water to each section of baseboard

Regulate the water in the supply line to the boiler

Balance the water flow rate in the piping system

Protect the boiler against excessive water temperatures

37. A pressure relief valve is set at 30 psig. The valve is constantly opening and flooding the floor. What should the technician do?

Increase the set point of the relief valve to 40 psig.

Find the cause of overfiring.

Put a bucket under the valve.

Both a and c are correct.

38. In a series loop, the water going through the last terminal unit will be the same temperature as the water through the first terminal unit.

True

False

39. An expansion joint is a device used to ______.

Prevent damage between boiler sections

Connect the expansion tank into the system

Allow for expansion and contraction of the loop piping with water temperature changes

Connect the manual vent into the system

40. The only place a bleed valve is needed is on the top of the boiler.

True

False

41. In a conventional gas furnace, the hot flue gases are ______.

Forced out a PVC vent with a blower

Recycled through a secondary heat exchanger and then vented through a draft diverter

Forced through a type B vent by a blower

Vented by natural convection

42. The pressure relief valve ______.

Regulates the pressure of the water in the supply line

Is set to relieve the pressure in the boiler below the maximum design pressure of the boiler

Shuts the boiler off if the water temperature gets too high

Relieve the pressure in the expansion tank

43. A column of water on foot high exerts a pressure of ______.

0.396 psig

0.407 psig

0.433 psig

0.496 psig

44. In a series loop hydronic heating piping systems, ______.

The heated water flows in the same direction in parallel pipes

The heated water flows in the opposite direction in parallel pipes

Part of the heated water is directed to each terminal unit

All the heated water flows through all the terminal units

45. Expansion tanks must always be bled from the top until all of the air is removed from it.

True

False

46. The expansion tank provides a means of removing the air from the system as well as ______.

Provides a space for excess water from the supply source

Provides water for the domestic hot water coil

Provides a space for the water expansion and contraction with water temperature changes

All of the above

47. A series loop hydronic system is not desirable for use in a large residence because ______.

All of the heated water will flow to all the rooms

Some rooms will overheat before other rooms are warm

They are extremely noisy

Both a and b

Ac332 Gas Heat