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PIPE > CHAPTER 8 (BOILER) > Flashcards

CHAPTER 8 (BOILER) Flashcards

1
Q

Which of the following is necessary to generate steam in a boiler?

A

all of the above

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2
Q

It is the part of the boiler with water on one side and heat on the other side.

A

heating surface

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3
Q

A ______ boiler has heat and gases of combustion that pass through tubes surrounded by water

A

fire tube

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4
Q

A _____ boiler has water in the tubes and heat gases of combustion passing around the tubes

A

water tube

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5
Q

Which of the following are used in boilers to direct the gases of combustion over the boiler heating surface?

A

Baffles

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6
Q

The three-basic type of low pressure heating boilers are ____, _____, and _____.

A

fire-tube; water tube; cast iron sectional

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7
Q

In a low pressure gas system, the gas regulator reduces that city gas pressure to ___ psi.

A

0

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8
Q

In the ____ air mixes with the fuel and burns.

A

combustion chamber

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9
Q

The function of the steam boiler is to ________.

A

produce steam

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10
Q

Which of the following is the most common type of water tube boiler?

A

straight-tube multiple pass

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11
Q

Excess fuel oil in the fuel oil system returns to the:

A

fuel oil tank

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12
Q

It is the system that provides the air necessary for combustion.

A

draft

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13
Q

The gases of combustion leave the boiler through the:

A

breeching

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14
Q

Which of the following boiler does not use tubes?

A

cast iron sectional

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15
Q

Which of the following will make a boiler work more efficiently?

A

the heating surface is increased

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16
Q

What are the four systems necessary to operate boiler?

A

feedwater; fuel; draft; steam

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17
Q

The _____ forms a vacuum that draws out of the condensate return line and into the vacuum tank.

A

vacuum pump

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18
Q

Which of the following can be a function of the container in a boiler?

A

all of the above

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19
Q

At what temperature will water normally turns to steam?

A

212°F

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20
Q

Which of the following statements is true for cast iron sectional boilers?

A

none of the above

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21
Q

Which of the following is the most important valve on a boiler?

A

safety valve

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22
Q

The MAWP on a low pressure steam boiler is ____ psi.

A

15

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23
Q

Which of the following best defines a total force acting on a boiler?

A

area times pressure

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24
Q

The ASME code states that boiler with over ____ square feet heating surface must have two or more safety valve.

A

500

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25
Q

The area of a safety valve 4” in diameter is how many square inches.

A

12.5664

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26
Q

Which of the following is the only valve permitted between safety valve and the boiler?

A

no valves are permitted between the boiler and safety valve

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27
Q

The range of the pressure gauge should be ____ times the MAWP of the boiler.

A

1 1/2 to 2

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28
Q

The ASME code only allows ____ safety valve on boiler.

A

spring-loaded pop-type

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29
Q

How much is the total force on a safety valve 2 1/2 in diameter and with a steam pressure of 15 psi?

A

73.63125

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30
Q

The steam pressure gauge on the boiler is callibeated to read in:

A

pounds per square inch

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31
Q

Live steam is prevented from entering the Bourdon tube of the pressure gauge by which of the following?

A

siphon

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32
Q

What pressure gauge that can read whether vacuum pressure or not?

A

compound

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33
Q

Which of the following best defines a vacuum?

A

a pressure below atmospheric

34
Q

Safety valves are designed to pop open and stay until there is a ___ psi drop in pressure.

A

2 to 4

35
Q

What type of boiler that uses safety valve?

A

all of the above

36
Q

The water is located at the NOWL so the lowest visible part of the gauge glass is ____ above the highest surface.

A

2” to 3”

37
Q

Blowback of a safety valve is to prevent:

A

chattering

38
Q

The boiler bottom blowdown line should discharge to a(n) _____.

A

blowdown tank

39
Q

If the desired cut-in pressure of the boiler is 6 psi and the desired cut-out pressure is 10 psi, the differential pressure setting must be ___ psi.

A

4

40
Q

Impurities that build up on the surface of the water in the boiler prevent ____ from breaking through the surface of the water.

A

steam

41
Q

To prevent air pressure from building up in the boiler when filling the boiler with water, the ____ must be open.

A

boiler vent

42
Q

The operating range of the boiler is controlled by:

A

pressure control

43
Q

The ______ regulates the high and low fire of the burner

A

modulating pressure control

44
Q

The best time to blow down the boiler to remove sludge and sediments is when boiler is at:

A

its lightest load

45
Q

The level of the water in the ____ indicates the water level in the boiler.

A

gauge glass

46
Q

When blowing down a boiler, the quick- opening valve should always be opened ____ and closed _____.

A

first, last

47
Q

Which of the following is added to boiler so that water changes scale-forming salts into a non adhering sludge?

A

Chemicals

48
Q

A ______ valve is installed before the ____ to allow the stean pressure gauge to be changed if malfunction occurs.

A

gate, siphon

49
Q

What pressure gauge that reads more pressure than is actually in the boiler?

A

fast

50
Q

According to ASME code, safett valves on low pressure should be tested by hand atleast

A

once a month

51
Q

According to ASME code, safett valves on low pressure should be tested by hand atleast

A

once a month

52
Q

The purpose of safety valve is prevent pressure in the boiler from:

A

exceeding its MAWP

53
Q

The term applied when a safety valve opens and closes rapidly

A

Chattering

54
Q

The safety valve on low pressure boiler opens when pressure in the boiler exceeds how many psi?

A

15

55
Q

After the total force of the steam has lifted the safety valve off its seat, the steam enters the _____

A

huddling chamber

56
Q

Wgat causes false water level readings in the gauge glass?

A

Foaming

57
Q

Fusible plugs are required on ____ boilers by the ASME code

A

all of the above

58
Q

On a pressure control, ____ pressure plus ____ pressure equals ____ pressure

A

cut in; differential ; cut in

59
Q

On a pressure control, ____ pressure plus ____ pressure equals ____ pressure

A

cut in; differential ; cut in

60
Q

A burner should always start up in ___ fire and shut down in ___ fire.

A

low, low

61
Q

The water in the boiler is heated, turns to steam, and leaves the boiler through the:

A

main steam line

62
Q

When steam gives up its heat in a heat exchanger it turns to:

A

condensate

63
Q

A ____ pump discharges the return water back to the boiler

A

vacuum

64
Q

How do you call a valve thaht controls the flow of water in one direction only?

A

check

65
Q

The feedwater ___valve should be located as close to the shell of the boiler as practical

A

stop

66
Q

A ____ after each radiator allows ___ to pass through to the return line

A

steam trap; condensate

67
Q

A ____ valve should be located between boiler and the valve on the feedwater line

A

stop; check

68
Q

The feedwater ____ valve opens and closes automatically

A

check

69
Q

The vacuum pump pumps water and discharges air to the :

A

atmosphere

70
Q

The range of pressure on vacuum switch is usually:

A

2” to 8”

71
Q

Top test the vacuum pump, the operator puts the selector switch in the ___ position

A

continuous

72
Q

Water added to the boiler to replace water lost due to leaks and blowing down is known as ___ water

A

make up

73
Q

Excessive use of cold city water makeup reduces ovevrall efficiency because the water must be ____ before use in the boiler

A

heated

74
Q

The vacuum pump selector switch is normally in the position during the heating season

A

float or vacuum

75
Q

The ___ shuts off the burner in the event of low water

A

low water fuel cut-off

76
Q

Water is supplied to the condensate return tank by the ___ pump

A

vacuum

77
Q

The feedwater regualtor is located at the ____ and is connected to the boiler in the same manner as the ___

A

NOWL; water column

78
Q

What maintains a constant water level in boiler?

A

feedwater regulator

79
Q

The low water fuel cut off should be tested:

A

daily

80
Q

The burner should be ____ when the low water cut off is blow down

A

firing

81
Q

Which of the following valve must be used as boiler main steam stop valve?

A

os&y gate

PIPE (17 decks)

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