Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chief 1 > Chief 5 > Flashcards

Chief 5 Flashcards

1
Q

The flame sensing device which uses flame rectification to detect a main burner gas flame senses the alternating current which has been changed from direct current by the heat of the burner flame

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

When applying a hydrostatic test to a boiler the test pressure must be held for 30 minutes

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

If a boiler operates at a pressure above 400 PSI that boiler must be provided with two water gauge glasses

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A siphon or loop is used on a steam gauge to protect it but it is not a requirement of the new your state boiler code

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Y type globe valves are permitted in horizontal piping but not in vertical piping

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When the tensile strength of steel shell plates is not known it shall be taken at 55,000 lb per square inch

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Gate valves are not suitable for throttling with a valve partially open

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Caustic and brittleman can be defined as a weakening of boiler steel as a result of inner crystalline cracks to the Shell

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

A flame sensing device that is sensitive to ultraviolet light will not sense the red phrase emitted from a hot refractory

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

A manhole gasket should not be thicker than 1/4 inch

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

If a boiler has a minimum working pressure of 135 PSI a proper safety valve would not allow the boiler pressure to exceed 150 psi if the boiler malfunctioned and caused over firing

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The minimum size of pipes connecting the water column to the boiler Shall be 3/4-in

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Hydrostatic test must be conducted with water at a temperature no lower than 70° f

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The total head of a pump is calculated by adding the suction lift and the suction head

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The freezing point of a solution used in a brine refrigeration system is about 10 degrees Fahrenheit

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

If the capacity of a 1-in diameter pipe is 100 gallons per hour the capacity of a 5-in diameter pipe is about 500 gallons per hour

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Asme code requires all boilers to be subjected to a hydrostatic test of the greater of 60 PSI or one and a half times the working pressure

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

A 5-ft length of one and a quarter thin pipe will equal the square foot of EDR of a cast iron radiator who’s dimensions are 9 and 3/4 wide 20 in high and 17 and a half long

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Common glass cannot be used in the manufacturer of ultraviolet tubes as glass will screen out UV energy

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

If a successful accumulation test was conducted on a boiler whose safety valve was set at 50 psi the pressure during the test should never exceed 60 PSI

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

A “tuyere” is found use on certain types of coal-fired boilers

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Single retorts stokers are used with either screw feed or ram feed

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

If air is cold from 80° f to 40° f it’s moisture content increases

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Ammonia requires a greater displacement than Freon number 12 to produce one ton of refrigeration

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

A squirrel cage deduction motor has a greater air gap than a synchronous motor

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Usually a boiler feed pump is of proper size when it is capable of delivering one cubic foot of water per hour for every boiler horsepower

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

On ammonia compressor should be started with the suction valve opened and the discharge valve closed

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

The corrosive action of the flu gases in an oil-fired boiler would be more noticeable if the flu gas temperature was increased

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

A whistling noise in the expansion valve of an ammonia system indicates on the insufficient amount of refrigerant in the system

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

The problem of scale is greater in a high pressure boiler than in a low pressure boiler

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

The difference between wet and dry bulb temperature increases as the air becomes dryer

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

It is easier to detect on ammonia leak than a Freon leak in a refrigerated system

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

On electric heater rated at 2000 watts would deliver approximately $6, 820 BTUs

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Water is most dance at 300° f

A

F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

To obtain the cubic foot per hour of gas required by a gas fired boiler divide the btu input rate by the heating value of the gas per cubic foot

A

T

36
Q

A solution having a pH of 5 is _____times more acid than a solution with a pH of 7

A

100

37
Q

The temperature of air surrounding a 40° C electric motor is 78°, what is the ambient temperature

A

78 degrees

38
Q

The maximum time allowed for trial of ignition on the main flame of an oil burner is

A

60 seconds

39
Q

When charging an ammonia system most plants make the charge between the

A

King valve and the expansion valve

40
Q

Steam gauges Shelby connected to a boiler with a siphon or loop of a size not smaller than

A

1/4 in

41
Q

What a fire tube boiler cannot be taken out of service for any great length of time to permanently repair an interior to bleak the boiler inspector may allow

A

The use of a tube stopper

42
Q

The pitch of rivets in a boiler seem joint is the

A

Distance between center lines of adjacent rivets

43
Q

EDR equivalent direct radiation is defined as the exchange of______BTUs per cubic foot of radiation an hour

A

240

44
Q

Modern electric motors are considerably smaller than older motors of the same horsepower because the use of

A

Thinner insulating material

45
Q

A high starting torque diminishing as the motor comes up to speed is a characteristic of a

A

Capacitor start motor

46
Q

Only two gauge cocks are required on

A

Boilers not over 36 in in diameter

47
Q

A flame since a device that uses flame rectification for proving burner light off is a

A

Flame rod

48
Q

A 27-year-old boiler that did not have a hydrostatic test would have a factor of safety of

A

5.5

49
Q

Which of the following is not a factor which governs the size of a safety valve for a boiler

A

Spring tension

50
Q

If a boiler was being repaired with a laptop patch the patch should overlap the patched area by at least

A

1/2 in

51
Q

The distance from a point above the top row of tubes to the lowest reading on the water glass of a HRT boiler should be no less than

A

3 in

52
Q

On elliptical manhole opening in a water to boiler shall not be less than

A

160 square inches

53
Q

A boiler is required to have more than one safety valve if the water heating surface exceeds

A

500 square feet

54
Q

Independently fired superheaters which qualify as a fire pressure vessel shall have one or more safety valves shall have a discharge capacity equal to

A

Six pounds of steam per square foot of heater surface

55
Q

A whistling noise in the expansion valve of an ammonia system indicates an

A

Insufficient amount of refrigerant in the system

56
Q

The type of stress which tends to pull a body apart is a

A

Tensile stress

57
Q

After operating the suit blower out of water tube boiler the temperature of the flu gas at the stack should be

A

Lower

58
Q

The largest size safety valve would have a diameter of

A

5 in

59
Q

Which one of the following answer choices is not a desired characteristic of an ideal refrigerant

A

odorless

60
Q

Ammonia system condenser tubes are usually constructed of

A

Cast iron

61
Q

Which of the following ammonia evaporators has the highest heat transfer rates

A

Completely flooded

62
Q

Which is a cause of a low head pressure in a refrigeration system

A

Not enough refrigerant

63
Q

A slow opening valve is one which requires at least

A

Five 360 degree turns of the operating mechanism

64
Q

The location of the New York state standard stamp on a HRT boiler is always found on

A

The front head above the tubes

65
Q

A globe valve is better suited for

A

Applications requiring frequent operations

66
Q

The wearing ring used on a centrifugal pump is found located between the

A

Casing and impeller

67
Q

One in good condition and when exposed to normal suction heads which one of the following types of pumps must be primed

A

Centrifugal

68
Q

If cavitation appears in a pump it will most likely attack the

A

Impeller

69
Q

On ammeter is connected to the secondary of a current transformer with a ratio of 100 to 5 if the m meter indicates 4 amps the current in the primary circuit will be most nearly

A

80 amps

70
Q

The corrosive action of the flu gases in an oil-fired boiler would be more noticeable if the flu gas temperature was

A

Decreased

71
Q

Welded joints on boilers are attested by

A

X-ray

72
Q

Bucket traps are two types

A

Up right and inverted

73
Q

The soap destroying property in water is best defined as

A

Hardness

74
Q

The first requirement of a trap is that it allows the passage of _______and prevents the passage of_____

A

Condensate

Steam

75
Q

There are______cubic inches in a gallon

A

231

76
Q

The maximum unit of stress that can be applies to a material without causing a permanent set is called

A

Elastic limit

77
Q

A gallon of number 6 fuel oil will provide approximately________ btus

A

150,000

78
Q

The deep guttering or lines of pits in piping caused by dissolved gases is called

A

Grooving

79
Q

The test used to determine the amount of dissolved oxygen in boiler water is called______test

A

Winkler

80
Q

A________is used to measure very high temperature

A

Pyrometer

81
Q

What facts are determines whether a boiler is considered high pressure or low pressure

A

The safety valve setting

82
Q

Every boiler should be internally inspected how often

A

Once per year

83
Q

Every boiler should be externally inspected how often

A

Two times per year once at internal and then six months after internal

84
Q

What factor of safety is used for boiler 23 years old

A

Five times up to 25 years

85
Q

When is a boiler exempt from a fusible plug

A

Automatically fired gas or oil

Chief 1 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions