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Flashcards in Heating Period 1 (CND) Deck (97)
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1

I.B.R.

Institute of boiler & radiator Manufacturers

2

Min. Boiler Pressure?

12 Lbs

3

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

BTU

4

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

Low Pressure boiler

5

Indicate pressure & temp. within a hot water boiler?

Combination Gauge

6

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

Expansion/Diaphragm tank

7

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

Thermal mass

8

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

Low water cut off

9

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

PRV (Pressure Reducing Valve)

10

First supplied , First returned is a good description of?

Direct Return System

11

First supplied, last returned is a good description of?

Reverse return system

12

Monoflow tees are used on a?

One pipe system

13

Transfer of heat through a solid is known as?

Conduction

14

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

Radiation

15

Transfer of heat through a liquid or gas?

Convection

16

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

Latent Heat

17

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

Sensible Heat

18

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

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

19

How are low temp. boilers rated?

BTU/h or EDR

20

Definition of net rating?

Amount of heat energy available at the heat transfer units

21

What two large categories do hot water boilers fall under?

Pressure & temperature

22

Low temp boilers are covered under?

A.S.M.E. Section IV

23

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

Code

24

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

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

25

Definition of boiler input?

Amount of energy consumed by the boiler

26

Cast iron sectional boiler could be classified as a ?

High mass boiler

27

Hot water boiler that can directly heat domestic water>

Copper tube boiler

28

Fire tube boiler is classified as a ?

High mass boiler

29

What can cause coil damage in a low mass boiler?

Little to no water flow

30

What is the purpose of a boiler operating control?

To control the normal temperature range of a boiler

31

A device that protects the boiler from excessive temp?

Limit Control

32

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

Flow Switch

33

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

Probe type low water cut off

34

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

Diaphragm/Expansion Tank

35

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

Steam Boiler

36

pressure reducing valve is located on what type of boiler?

Hot water boiler

37

What is the purpose of a wild loop?

To prevent the pump from dead heading

38

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

Convection

39

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

Lock shield radiator valve

40

Process of manufacturing pipe?

Cross linked

41

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

One pipe system

42

What is the purpose of a flow control valve?

to prevent convection currents in a heating system

43

Where is the best location for a circulator?

downstream from the compression tank

44

What two variables do you find on a pump curve?

head and flow

45

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

moves water within the system

46

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

boiler scoop

47

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

to prevent air binding in the system

48

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

temperature and pressure

49

What is the purpose of a zone valve?

to provide control of heat emission

50

What is the purpose of a balancing valve?

to adjust flow rates to each heat transfer unit

51

a good choice for use as an isolation valve?

ball Valve

52

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

hard to balance flow to each heat transfer unit

53

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

end heat transfer units receive cooler water

54

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

limited heating capacity for each circuit

55

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

two-pipe reverse return

56

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

series loop

57

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

Type DWV

58

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

steel pipe, Type M copper tube, PEX tubing

59

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

A low pressure Cast Iron boiler

60

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?

Float type low water cut-off

61

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

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

62

Which of the following is a definition of net rating?

amount of heat energy available at the heat transfer units

63

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

draft hood spillage or damage caused by corrosive condensate

64

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

ASME code (American Society of Mechanical Engineers)

65

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

low or no flow through the heat exchanger

66

What is the purpose of a safety relief valve?

to protect the boiler and system from excess pressure

67

What is the purpose of a boiler operating control?

to control the normal temperature range of a boiler

68

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

Pressure Reducing Valve

69

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

expansion tank

70

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

pressure reducing valve

71

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

sight glass

72

What causes convection currents?

different air densities

73

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

convection

74

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

True

75

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

conduction

76

How is finned tube baseboard rated?

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

77

How is the heat output of finned tube baseboard controlled?

by adjusting the damper

78

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

Heat output would be reduced.

79

Atmosphere is described as?

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

80

What material is commonly used to construct sectional boilers?

Cast Iron

81

What is the purpose of the safety relief valve?

To protect the boiler and system from excess pressure

82

What is the purpose of the boiler operating control?

To control the normal temperature range of the boiler

83

What is needed to size a pump?

Head & Flow

84

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

The point of no pressure change

85

Water is most dense at?

4*C or 39.2*F

86

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

970 BTU's/per pound

87

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

15 psi

88

Velocity energy of a circulator is created by?

Vanes of the impellor

89

What causes convection currents?

Different air densities

90

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

True

91

U.L.C stands for?

Underwriters Laboratories of Canada

92

ASTM stands for?

American Society of Testing & Materials

93

CGA stands for ?

Canadian Gas Association

94

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

True

95

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

Approved backflow preventer

96

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

True

97

What device cycles a steam boiler on and off?

Pressure troll