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Chief 3 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 currents by the heat of the burner flame

A

T

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2
Q

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

A

T

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3
Q

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

A

T

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4
Q

Are siphon or loop is used on a steam gauge to protect it but it is not a requirement of the New York State boiler code

A

F

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5
Q

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

A

F

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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

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7
Q

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

A

T

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8
Q

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

A

T

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9
Q

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

A

T

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10
Q

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

A

T

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11
Q

If a boiler has a maximum 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 overfiring

A

F

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12
Q

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

A

F

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13
Q

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

A

T

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14
Q

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

A

F

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15
Q

The freezing point of a solution used in a brine refrigeration system is about 10° f

A

F

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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

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17
Q

Asme code requires all boilers to be subjected to a hydrostatic test of the greater of 60 PSI or 1 1/2 times the working pressure

A

T

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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 whose dimensions are 8 and 3/4 wide 20 in high and 17 and 1/2 in Long

A

T

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19
Q

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

A

T

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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

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21
Q

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

A

T

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22
Q

Single retort stoker’s are used with either screw feed or ram feed

A

T

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23
Q

The error is cooled from 80° f to 40° f it’s moisture content increases

A

F

24
Q

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

A

F

25
Q

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

A

T

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

27
Q

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

A

100

28
Q

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

A

15 seconds

29
Q

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

A

King valve and the expansion valve

30
Q

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

A

1/4in

31
Q

The pitch of rivets in a boiler seam joint is the

A

Distance between center lines of adjacent rivets

32
Q

E d r equivalent direct radiation is defined as the exchange of_____BTUs per cubic foot of radiation hour

A

240

33
Q

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

A

Thinner insulating material

34
Q

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

A

Capacitor start motor

35
Q

Only two gauge cocks are required on

A

Boilers not over 36 in in diameter

36
Q

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

A

Flame rod

37
Q

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

A

5.5

38
Q

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

A

Spring tension

39
Q

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

A

3 in

40
Q

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

A

160 square inches

41
Q

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

A

500 square feet

42
Q

independently fired superheaters which qualify as a fired pressure vessel she’ll have one or more safety valves shell have a discharge capacity equal to

A

6 lb of steam per square foot of heater surface

43
Q

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

A

Tensile stress

44
Q

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

A

Completely flooded

45
Q

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

A

Not enough refrigerant

46
Q

A globe valve is better suited for

A

Volume control

47
Q

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

A

Casing and the impeller

48
Q

what information or signal must be received before the sequence timer on the automatic burner control of a package boiler advances from pilot ignition to opening the main valve

A

The flame signal from the pilot

49
Q

The intensity of draft produced by a chimney depends upon what two factors besides outside the temperature and diameter

A

Temperature difference between stack gas temperature and outside ambient temperature calculated in absolute temperature 2 the height of the chimney 3. Atmospheric pressure

50
Q

If it were necessary to breathe air conditioning ammonia fumes and no mask was available what could you safely use

A

A wet rag placed over your mouth and nose

51
Q

Why is it more practical to use the indirect system of refrigeration for an ice skating rink

A

It is cheaper to install and repair glycol or saltwater instead of expensive refrigerants cheaper to repair safer when ammonia is used as the refrigerant

52
Q

Describe a total energy system

A

accordion recent system where a gas turbine engine is used to turn a generator in produce electricity and the heat from that engine is used to generate steam in a boiler with this system you can get two sources of energy from one source of fuel it is very efficient

53
Q

How many drums are in a d type water tube boiler

A

Two drums one main steam and water and one mud drum

54
Q

Explain the difference between fire cracks and lab cracks in boilerplate

A

Firecracks are cracks between the rivets that on each side of the joint lap cracks are cracks between adjacent rivets

55
Q

If there was no side Glass on an ammonia receiver how could you determine the liquid in the receiver

A

Heat the side up the receiver up and down with a torch carefully touch the heated area from the bottom up where the metal become hot is the liquid level

56
Q

If the steam heating system in your building continuously knocked due to water hammer how would you silence this

A

Check for plug strainers before the steam trap check for find and repair faulty steam traps check for improperly pitched steam and condensate return lines

Chief 1 (7 decks)

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