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Q-01 FDNY COMPLETE ACTUAL EXAM / QUESTIONS AND CORRECT ANSWERS 2024/2025 LATEST VERSION. $11.99   Add to cart

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Q-01 FDNY COMPLETE ACTUAL EXAM / QUESTIONS AND CORRECT ANSWERS 2024/2025 LATEST VERSION.

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  • FDNY.
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  • FDNY.

Q-01 FDNY COMPLETE ACTUAL EXAM / QUESTIONS AND CORRECT ANSWERS 2024/2025 LATEST VERSION. Rupture members, when used in parallel with a relief valve, are not to exceed _____% above designed working pressure - 20% Butterfly valve: where can it be used? - Can be used on the inlet and...

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  • September 26, 2024
  • 24
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • FDNY.
  • FDNY.
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Mboffin
Q-01 FDNY COMPLETE ACTUAL EXAM /
QUESTIONS AND CORRECT ANSWERS 2024/2025
LATEST VERSION.




Rupture members, when used in parallel with a relief valve, are not to exceed _____%
above designed working pressure - 20%

Butterfly valve: where can it be used? - Can be used on the inlet and outlet of a water
pump

What electrical motor protection device automatically resets itself? - The thermal
protector

746 watts equals how many kilowatt hours? - .746 kilowatt hours

What position is the liquid line service valve normally in? - Back-seated

In an operating evaporator, oil stays on top of which refrigerant? - Carbon dioxide, R-
744

At what pressure does the relief valve blow on a high pressure machine? - 300 psi

What would indicate a restriction (such as dirt or scale) in the liquid line? - Frost
immediately after the restriction

What does solubility mean? - The ability of a refrigerant to mix with other substances

Charging Vapor —In a compression system, where do you charge the vapor? - Suction
side of the compressor at the Suction Service Valve

When comparing a brine with s PH of 8 to one with a PH of 10, its alkalinity is: - 100
times greater (ex. PH 8 to PH 9 is 10 times greater)

In an efficiently operating induced draft cooling tower, the leaving water is between: -
Dry bulb and wet bulb temperature

To produce the desired evaporator temperature, the power input is reduced by keeping
head pressure... - Head pressure as low as possible & suction pressure as high as
needed

,The accumulator is usually between the... - Compressor and evaporator

An oiling system in a large centrifugal system should consist of at least... - Reservoir,
pump and distribution lines

In an evaporator that chills brine, the greatest cooling effect on the brine results from
the... - Boiling of low pressure liquid

The flow of weak liquor to the absorber is controlled by
A) gas pressure
B) throttling device
C) float valve
D) pressure of the strong liquor pump - B) throttling device

The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
C) Nessler reagent
D) carbonate of soda - C) Nessler reagent

The best time to purge an ammonia plant with 250 lbs. of ammonia is
A) during shut-down, because you will lose ammonia
B) while charging the plant
C) during operation
D) none of the above - C) during operation

What will make the strong liquor in the absorber decrease?
A) expansion valve open too much
B) A decrease in evaporator load
C) An increase in evaporator load
D) Too much steam on the generator - B) A decrease in evaporator load

Which of the following statements is incorrect?
A) A service valve is a key-operated shut-off valve used during shipment, installation
and repairs
B) Brine is a liquid cooled by refrigeration and used for the transmission of heat
C) A fusible plug has a set-temperature fusible member to relieve pressure
D) A rupture member automatically ruptures at a predetermined temperature - D) A
rupture member automatically ruptures at a predetermined temperature

Oil in a refrigerant should
A) have a high pour point
B) have a low flash point
C) have a high viscosity
D) not contain moisture - D) not contain moisture

, In an NH3 dry expansion evaporator with TXV and bulb clamped properly on the outlet
of the evaporator, the superheat is
A) 7 to 10° F
B) 5 to 9° F
C) 20 to 30° F
D) 1 to 2° F - A) 7 to 10° F

The setting of a fusible plug is
A) 280° F
B) 300° F
C) b380° bF
D) b300 bpsig. b- b bA) b280° bF

If bthe binsulation bwas bremoved bfrom bthe bbulb bof bthe bexpansion bvalve, bwhat bwould
bhappen? b- b bFlooded bevaporator b—the bTXV bbulb bopens bin ba brange bfrom b45 bto b85° bF. bIf

bthe binsulation bwas bremoved, bthe bbulb bwould bsense bthe btemperature bin bthe bmachine

broom band bkeep bthe bTXV bopen, bthus bflooding bthe bevaporator.




On bthe bmost bcommon bthree-phase, bfour-wire bservice, bthe bvoltage bbetween bany bphase
band bneutral bshould bbe

A) b105 bvolts
B) b120 bvolts
C) b208 bvolts
D) b220 bvolts b- b bB) b120 bvolts

A brefrigerant bovercharge bwould
A) bincrease bhead bpressure
B) bdecrease bhead bpressure
C) bdecrease bsolution-side bpressure
D) bdecrease bdischarge-side bpressure b- b bA) bincrease bhead bpressure

A bdryer bis bgenerally binstalled bwith bother bequipment bin ba bcommercial bFreon bcompressor
bsystem. bThe brecommended blocation bof bthis bdryer bis bon bthe

A) bhigh-pressure bline bbetween bcondenser band breciever
B) bsuction bline bbetween bevaporator band bcompressor
C) bdischarge bline bbetween bcompressor band bcondenser
D) bliquid bline bbetween breceiver band bexpansion bvalve b- b bD) bliquid bline bbetween breceiver
band bexpansion bvalve




R-22 b—What bdoes bit bsmell blike? b- b bOdorless

Desirable bcharacteristics bof ba brefrigerant:
A) bHigh b__________
B) bLow b__________ b- b bA) bHigh bcritical bpoint
B) bLow bfreezing bpoint

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