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Boiler Prep > Chapter 1 > Flashcards

Chapter 1 Flashcards

City of Chicago boiler exam

1
Q

Cast iron boiler stacked up in pieces is called?

A

Horizontal sectional

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2
Q

Boilers to a common header operating at 50 PSI each. The master gauge manifold would read what?

A

50 PSI

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3
Q

A safety valve is set to pop at above what MAWP?

A

5psi

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4
Q

Periodically, a bucket of water should be poured down a floor drain. Why?

A

To prevent gases from escaping

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5
Q

The last alarm to go before a vertical tube broilers tube melt?

A

Fusible plug

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6
Q

What operations does not require purging?

A

Low water cut off

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7
Q

In an electric boiler, water is heated by electrodes by?

A

Electric flow through water

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8
Q

To prevent a fire, what should you remove from the boiler room?

A

Oily rags

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9
Q

When installing an Hg pressure gauge, what should be done for proper operation?

A

Must be installed horizontally

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10
Q

When gas is heated to double its temperature what happens?

A

The volume doubles

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11
Q

All the following are advantages of natural gas except?

A

Needs little air to no air

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12
Q

What is installed in a feed water tank to prevent sludge from entering the boiler?

A

Blow down valve

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13
Q

In a low pressure boiler, how are the fittings made?

A

Made per ASME code based on each different type

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14
Q

What controls combustion efficiency?

A

Draft

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15
Q

All are unsafe practices by an operator when shutting down, except?

A

Venting before opening a man hole

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16
Q

All are unsafe practices by an operator when shutting down, except?

A

Venting before opening the man hole

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17
Q

What replaced staybolts in a water tube boiler?

A

Sinuous headers

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18
Q

When starting up a cold boiler, everything is true except?

A

Main steam stop valve should be open

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19
Q

If a centrifugal pump is cavitating, what would cause the damage?

A

Vibration

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20
Q

In a water tube boiler the gases of combustion pass, where?

A

Around the tubes

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21
Q

When steam is heated it’s volume does what?

A

Stays the same

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22
Q

Air that controls the rate of combustion efficiency is what?

A

Primary

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23
Q

How fo you test for flame failure?

A

Cover the infrared scanner eye

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24
Q

A duty that is not part of the boilers operators

A

Inspecting the boiler

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25
Q

To eliminate the danger of an explosion during start up

A

Firing sequence must allow for purging

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26
Q

When blowing down a boiler with a quick opening and screw type valve

A

Quick opening is opened first and closed last

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27
Q

What is sensitive to change in steam flow and pressure?

A

The metering combustion control

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28
Q

What does the term “drop a plug” mean?

A

Fusible plug has melted (last low water alarm)

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29
Q

Ratio of heat supplied in fuel to heat absorbed by water

A

Thermal efficiency

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30
Q

Main function of water column?

A

Reduce turbulence

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31
Q

A boiler operating at 14psi is what?

A

Low pressure

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32
Q

In a low pressure, what should never be placed between the safety relief valve and the boiler?

A

Shut off valve

33
Q

Water and foam extinguishers should be used in what type of fires?

A

Type A fire

34
Q

Which is the best way to vent low pressure boiler which does not have a air vent?

A

With the try cocks (top one)

35
Q

If the top line gauge glass is blocked the gauge glass will what?

A

Fill up with water and give a false reading.

36
Q

Before removing a handhole, the operator must make sure what?

A

That there is no vacuum in the boiler

37
Q

Steam separators do all of the following except?

A

Increase steam temperature

38
Q

For blow down operations, the most important fitting is what?

A

Blow down valve

39
Q

The most important fitting on a boiler is what?

A

Safety valve

40
Q

The means of deciding frequency of a blow down.

A

Water analysis

41
Q

A low pressure gas system is safer than a high pressure gas system because?

A

Less possibilities of leaks

42
Q

A cause of over heating boiler tubes is?

A

Scale formation

43
Q

Steam expands approximately how many times as it turns from water to steam at 14.7 PSIA?

A

1600 times

44
Q

What accidents must be logged?

A

Any and all accidents

45
Q

Who do you notify when you have an emergency in the boiler room?

A

Chief or lead shift engineer

46
Q

When bringing a low pressure boiler online, what must a operator must NEVER do before opening a steam/ water valve?

A

Allow the steam side to cool down

47
Q

Why must an operator wear safety goggles when inspecting a flame?

A

Protection from UV rays

48
Q

When working inside a boiler what must be present?

A

Another person outside the boiler

49
Q

When burning pulverized coal, the fire box is in what type of pressure?

A

Negative pressure

50
Q

When too much oxygen is in the feed water, what may occur?

A

Scaling

51
Q

Can steam be superheated in a low pressure boiler?

A

Yes

52
Q

By switching leads on a motor, you can reverse the direction only in what phase motor?

A

3 phase

53
Q

How many blow down valves are required on a boiler operating above 100psi?

A

2

54
Q

What type valve should be used for throttling services

A

Globe valve

55
Q

A water fire extinguisher should be used on what class fires?

A

A

56
Q

A high pressure boiler is not normally used in what type of application?

A

Residential

57
Q

Natural draft is produced by what?

A

Chimney

58
Q

The manual reset valve will not reset unless, what?

A

The pilot flame has been produced

59
Q

When fuel is burned using only the minimum of excess air, it is called what?

A

Complete combustion

60
Q

Most furnace explosions at start up are caused by what?

A

Not pre-purging

61
Q

A stream pressure gauge should have a range NOT LESS than what?

A

1 1/2 the safety valve settings

62
Q

Caustic embrittlement is most often found where?

A

At the end of the tubes

63
Q

What is class A fire?

A

Wood and paper

64
Q

What does a microprocessor burner control do?

A

Starts and stops the boiler

65
Q

In order to produce one pound of steam, how many pounds of water must be evaporated?

A

1

66
Q

When installing a new gauge glass you should allow what size clearance?

A

1/4 inch

67
Q

Boiler tubes are measured by the inside or outside diameter?

A

Outside

68
Q

The dry pipe is located in the?

A

Upper part of the steam and water drum

69
Q

Secondary air controls the?

A

Combustion efficiency

70
Q

What is the practical way to tell what the max pressure for a safety valve is

A

Manufacturers chart

71
Q

Positioning and pneumatic control systems need what to operate properly?

A

Clean, dry air

72
Q

What condition is least likely to happen on a worn modulating linkage?

A

Slow response time

73
Q

What is the most correct statement regarding what an operator must do while working on a laid up boiler?

A

Remove any locks and tags

74
Q

What do you do when a boiler goes into flame failure?

A

Secure and purge

75
Q

Using completley purified water is or is not suitable for electric boilers?

A

Not suitable

76
Q

What valve gives the least resistance to flow?

A

OS&Y gate valve

77
Q

What is the transfer of heat when it moves from molecule to molecule?

A

Conduction

78
Q

All are true of Scotch marine boilers except what?

A

Low cost start up

Boiler Prep (1 decks)

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