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Plumbing/Gasfitting Period 1 (CND) > Heating Period 1 (CND) > Flashcards

Heating Period 1 (CND) Flashcards

1
Q

I.B.R.

A

Institute of boiler & radiator Manufacturers

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2
Q

Min. Boiler Pressure?

A

12 Lbs

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3
Q

Best describe the amount of energy required to raise the temp. of 1 pound of water through 1 F?

A

BTU

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4
Q

Boiler limited to a max working pressure of 30 psig to 15 psig?

A

Low Pressure boiler

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5
Q

Indicate pressure & temp. within a hot water boiler?

A

Combination Gauge

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6
Q

Completely closed tank containing water & air. Allows expanded water to enter & leave?

A

Expansion/Diaphragm tank

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7
Q

Any material used to store heat energy or the affinity for heat energy?

A

Thermal mass

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8
Q

A float/Probe operated device used to shut down the fuel burner when the water level in the boiler drops below operating level?

A

Low water cut off

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9
Q

A device with a globe valve pattern that is used to reduce city water pressure?

A

PRV (Pressure Reducing Valve)

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10
Q

First supplied , First returned is a good description of?

A

Direct Return System

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11
Q

First supplied, last returned is a good description of?

A

Reverse return system

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12
Q

Monoflow tees are used on a?

A

One pipe system

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13
Q

Transfer of heat through a solid is known as?

A

Conduction

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14
Q

Transfer of heat from one object to another through an intervening space?

A

Radiation

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15
Q

Transfer of heat through a liquid or gas?

A

Convection

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16
Q

Heat required to change the state of water is known as?

A

Latent Heat

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17
Q

Energy required to raise temp. without changing state s known as?

A

Sensible Heat

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18
Q

The mas operating temp & pressure of a low temperature hot water boiler ?

A

120 C (250 F) 1100kpa (160psig)

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19
Q

How are low temp. boilers rated?

A

BTU/h or EDR

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20
Q

Definition of net rating?

A

Amount of heat energy available at the heat transfer units

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21
Q

What two large categories do hot water boilers fall under?

A

Pressure & temperature

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22
Q

Low temp boilers are covered under?

A

A.S.M.E. Section IV

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23
Q

Could be adopted by a legal jurisdiction and made into a law?

A

Code

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24
Q

What is the BTU value of an EDR? (Hint: Steam_____, Hot Water_____)

A

Steam 240 BTU/hr, Hot Water 150BTU/hr

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25
Q

Definition of boiler input?

A

Amount of energy consumed by the boiler

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26
Q

Cast iron sectional boiler could be classified as a ?

A

High mass boiler

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27
Q

Hot water boiler that can directly heat domestic water>

A

Copper tube boiler

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28
Q

Fire tube boiler is classified as a ?

A

High mass boiler

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29
Q

What can cause coil damage in a low mass boiler?

A

Little to no water flow

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30
Q

What is the purpose of a boiler operating control?

A

To control the normal temperature range of a boiler

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31
Q

A device that protects the boiler from excessive temp?

A

Limit Control

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32
Q

what mandatory device is required on a coil type boiler over 400000 BTU/hr?

A

Flow Switch

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33
Q

What device can be installed to protect a hot water boiler from low water level?

A

Probe type low water cut off

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34
Q

A device that compensates for expansion & contraction of the water in a hot water boiler?

A

Diaphragm/Expansion Tank

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35
Q

You would find a sight glass on what type of boiler?

A

Steam Boiler

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36
Q

pressure reducing valve is located on what type of boiler?

A

Hot water boiler

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37
Q

What is the purpose of a wild loop?

A

To prevent the pump from dead heading

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38
Q

What method of heat transfer does finned tube baseboard utilize in heating?

A

Convection

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39
Q

What type of radiator valve should be installed to prevent unauthorized use?

A

Lock shield radiator valve

40
Q

Process of manufacturing pipe?

A

Cross linked

41
Q

The piping system in which the heating transfer units are supplied by special tees?

A

One pipe system

42
Q

What is the purpose of a flow control valve?

A

to prevent convection currents in a heating system

43
Q

Where is the best location for a circulator?

A

downstream from the compression tank

44
Q

What two variables do you find on a pump curve?

A

head and flow

45
Q

What function does a circulator provide in a hot water heating system?

A

moves water within the system

46
Q

What device removes gases directly and air from the water leaving the boiler?

A

boiler scoop

47
Q

Why is it important to remove gases from a hot water heating system?

A

to prevent air binding in the system

48
Q

What are the two primary considerations when locating air elimination devices?

A

temperature and pressure

49
Q

What is the purpose of a zone valve?

A

to provide control of heat emission

50
Q

What is the purpose of a balancing valve?

A

to adjust flow rates to each heat transfer unit

51
Q

a good choice for use as an isolation valve?

A

ball Valve

52
Q

What is the major disadvantage of a two-pipe direct return piping system?

A

hard to balance flow to each heat transfer unit

53
Q

What is a major disadvantage of a one-pipe system?

A

end heat transfer units receive cooler water

54
Q

What is a major disadvantage of the series loop piping system?

A

limited heating capacity for each circuit

55
Q

What is the name of the piping system in which the water has approximately the same distance to travel for each heat transfer unit?

A

two-pipe reverse return

56
Q

What is the name of the piping system in which the heating transfer units are part of the piping?

A

series loop

57
Q

Which of the following copper tube is not approved for hydronic heating?

A

Type DWV

58
Q

Which of the following piping materials are suitable for hot water heating?

A

steel pipe, Type M copper tube, PEX tubing

59
Q

Which term best describes a boiler limited to a maximum working pressure of 30 psig (water) or 15 psig (steam)?

A

A low pressure Cast Iron boiler

60
Q

A float-operated device used to shut down the fuel burner when the water level in the boiler drops below its operating level is called a?

A

Float type low water cut-off

61
Q

What is the maximum operating temperature and pressure of a low-temperature hot water boiler?

A

120ºC (250ºF), 1100 kPa (160 psig) or conventional cast iron 207 kPa (30 psig)

62
Q

Which of the following is a definition of net rating?

A

amount of heat energy available at the heat transfer units

63
Q

What problems can occur in a conventional boiler if the flue gases are cooled to their dew point?

A

draft hood spillage or damage caused by corrosive condensate

64
Q

What code covers the fabrication, installation and inspection of boilers?

A

ASME code (American Society of Mechanical Engineers)

65
Q

What can cause coil damage in a low-mass boiler?

A

low or no flow through the heat exchanger

66
Q

What is the purpose of a safety relief valve?

A

to protect the boiler and system from excess pressure

67
Q

What is the purpose of a boiler operating control?

A

to control the normal temperature range of a boiler

68
Q

What device is used to maintain a minimum pressure within a system?

A

Pressure Reducing Valve

69
Q

Which one of the following items would you find on a hot water boiler?

1) pressure operating control
2) sight glass
3) expansion tank
4) equalizer line

A

expansion tank

70
Q

Which one of the following items would indicate that you are looking at a hot water boiler and not a steam boiler?

1) makeup water line
2) backflow preventer
3) pressure operating control
4) pressure reducing valve

A

pressure reducing valve

71
Q

Which one of the following items would you find on a steam boiler?

1) line scoop
2) diaphragm tank
3) flow switch
4) sight glass

A

sight glass

72
Q

What causes convection currents?

A

different air densities

73
Q

What method of heat transfer does finned tube baseboard utilize in heating a room?

A

convection

74
Q

True or False: Free-standing cast iron radiator units produces significant amounts of radiated heat?

A

True

75
Q

What method of heat transfer is utilized by a plate heat exchanger?

A

conduction

76
Q

How is finned tube baseboard rated?

A

BTU per foot per hour based upon supply water temperature, flow rate and entrance air temperature of 65ºF`

77
Q

How is the heat output of finned tube baseboard controlled?

A

by adjusting the damper

78
Q

What effect would raising a fin vector above recommended installation height have on the heat output?

A

Heat output would be reduced.

79
Q

Atmosphere is described as?

A

14.7 psia, 29.92 in/hg & Pressure at sea level

80
Q

What material is commonly used to construct sectional boilers?

A

Cast Iron

81
Q

What is the purpose of the safety relief valve?

A

To protect the boiler and system from excess pressure

82
Q

What is the purpose of the boiler operating control?

A

To control the normal temperature range of the boiler

83
Q

What is needed to size a pump?

A

Head & Flow

84
Q

What is the place where the expansion device connects t a hydronic system called?

A

The point of no pressure change

85
Q

Water is most dense at?

A

4C or 39.2F

86
Q

How many BTU’s of latent heat must be added to one pound of water to change it to steam?

A

970 BTU’s/per pound

87
Q

For residential cast iron steam boilers, the stem pressure relief valve is set to discharge at a max. of?

A

15 psi

88
Q

Velocity energy of a circulator is created by?

A

Vanes of the impellor

89
Q

What causes convection currents?

A

Different air densities

90
Q

True or False: If two pumps are in series, the pressure is additive & the flow remains constant?

A

True

91
Q

U.L.C stands for?

A

Underwriters Laboratories of Canada

92
Q

ASTM stands for?

A

American Society of Testing & Materials

93
Q

CGA stands for ?

A

Canadian Gas Association

94
Q

True or False: In a one pipe counter flow steam system, the condensate and steam flow in opposite directions?

A

True

95
Q

All boiler make up water must be protected from cross connections by?

A

Approved backflow preventer

96
Q

True or False: If latent heat is taken away from water it will expand?

A

True

97
Q

What device cycles a steam boiler on and off?

A

Pressure troll

Plumbing/Gasfitting Period 1 (CND) (6 decks)

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