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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
The area of a safety valve 4" in diameter is how many square inches.
12.5664
26
Which of the following is the only valve permitted between safety valve and the boiler?
no valves are permitted between the boiler and safety valve
27
The range of the pressure gauge should be ____ times the MAWP of the boiler.
1 1/2 to 2
28
The ASME code only allows ____ safety valve on boiler.
spring-loaded pop-type
29
How much is the total force on a safety valve 2 1/2 in diameter and with a steam pressure of 15 psi?
73.63125
30
The steam pressure gauge on the boiler is callibeated to read in:
pounds per square inch
31
Live steam is prevented from entering the Bourdon tube of the pressure gauge by which of the following?
siphon
32
What pressure gauge that can read whether vacuum pressure or not?
compound
33
Which of the following best defines a vacuum?
a pressure below atmospheric
34
Safety valves are designed to pop open and stay until there is a ___ psi drop in pressure.
2 to 4
35
What type of boiler that uses safety valve?
all of the above
36
The water is located at the NOWL so the lowest visible part of the gauge glass is ____ above the highest surface.
2" to 3"
37
Blowback of a safety valve is to prevent:
chattering
38
The boiler bottom blowdown line should discharge to a(n) _____.
blowdown tank
39
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.
4
40
Impurities that build up on the surface of the water in the boiler prevent ____ from breaking through the surface of the water.
steam
41
To prevent air pressure from building up in the boiler when filling the boiler with water, the ____ must be open.
boiler vent
42
The operating range of the boiler is controlled by:
pressure control
43
The ______ regulates the high and low fire of the burner
modulating pressure control
44
The best time to blow down the boiler to remove sludge and sediments is when boiler is at:
its lightest load
45
The level of the water in the ____ indicates the water level in the boiler.
gauge glass
46
When blowing down a boiler, the quick- opening valve should always be opened ____ and closed _____.
first, last
47
Which of the following is added to boiler so that water changes scale-forming salts into a non adhering sludge?
Chemicals
48
A ______ valve is installed before the ____ to allow the stean pressure gauge to be changed if malfunction occurs.
gate, siphon
49
What pressure gauge that reads more pressure than is actually in the boiler?
fast
50
According to ASME code, safett valves on low pressure should be tested by hand atleast
once a month
51
According to ASME code, safett valves on low pressure should be tested by hand atleast
once a month
52
The purpose of safety valve is prevent pressure in the boiler from:
exceeding its MAWP
53
The term applied when a safety valve opens and closes rapidly
Chattering
54
The safety valve on low pressure boiler opens when pressure in the boiler exceeds how many psi?
15
55
After the total force of the steam has lifted the safety valve off its seat, the steam enters the _____
huddling chamber
56
Wgat causes false water level readings in the gauge glass?
Foaming
57
Fusible plugs are required on ____ boilers by the ASME code
all of the above
58
On a pressure control, ____ pressure plus ____ pressure equals ____ pressure
cut in; differential ; cut in
59
On a pressure control, ____ pressure plus ____ pressure equals ____ pressure
cut in; differential ; cut in
60
A burner should always start up in ___ fire and shut down in ___ fire.
low, low
61
The water in the boiler is heated, turns to steam, and leaves the boiler through the:
main steam line
62
When steam gives up its heat in a heat exchanger it turns to:
condensate
63
A ____ pump discharges the return water back to the boiler
vacuum
64
How do you call a valve thaht controls the flow of water in one direction only?
check
65
The feedwater ___valve should be located as close to the shell of the boiler as practical
stop
66
A ____ after each radiator allows ___ to pass through to the return line
steam trap; condensate
67
A ____ valve should be located between boiler and the valve on the feedwater line
stop; check
68
The feedwater ____ valve opens and closes automatically
check
69
The vacuum pump pumps water and discharges air to the :
atmosphere
70
The range of pressure on vacuum switch is usually:
2" to 8"
71
Top test the vacuum pump, the operator puts the selector switch in the ___ position
continuous
72
Water added to the boiler to replace water lost due to leaks and blowing down is known as ___ water
make up
73
Excessive use of cold city water makeup reduces ovevrall efficiency because the water must be ____ before use in the boiler
heated
74
The vacuum pump selector switch is normally in the position during the heating season
float or vacuum
75
The ___ shuts off the burner in the event of low water
low water fuel cut-off
76
Water is supplied to the condensate return tank by the ___ pump
vacuum
77
The feedwater regualtor is located at the ____ and is connected to the boiler in the same manner as the ___
NOWL; water column
78
What maintains a constant water level in boiler?
feedwater regulator
79
The low water fuel cut off should be tested:
daily
80
The burner should be ____ when the low water cut off is blow down
firing
81
Which of the following valve must be used as boiler main steam stop valve?
os&y gate

PIPE (17 decks)

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