Q 01 FDNY PRACTICE TEST 2026 UPDATED
QUESTIONS WITH ACCURATE ANSWERS
GRADED A+
⩥ Butterfly valve: where can it be used?
Answer: Can be used on the inlet and outlet of a water pump
⩥ What electrical motor protection device automatically resets itself?
Answer: The thermal protector
⩥ 746 watts equals how many kilowatt hours?
Answer: .746 kilowatt hours
⩥ What position is the liquid line service valve normally in?
Answer: Back-seated
⩥ In an operating evaporator, oil stays on top of which refrigerant?
Answer: Carbon dioxide, R-744
⩥ At what pressure does the relief valve blow on a high pressure
machine?
Answer: 300 psi
,⩥ What would indicate a restriction (such as dirt or scale) in the liquid
line?
Answer: Frost immediately after the restriction
⩥ What does solubility mean?
Answer: The ability of a refrigerant to mix with other substances
⩥ Charging Vapor —In a compression system, where do you charge the
vapor?
Answer: 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:
Answer: 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:
Answer: Dry bulb and wet bulb temperature
⩥ To produce the desired evaporator temperature, the power input is
reduced by keeping head pressure...
Answer: Head pressure as low as possible & suction pressure as high as
needed
,⩥ The accumulator is usually between the...
Answer: Compressor and evaporator
⩥ An oiling system in a large centrifugal system should consist of at
least...
Answer: Reservoir, pump and distribution lines
⩥ In an evaporator that chills brine, the greatest cooling effect on the
brine results from the...
Answer: 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
Answer: 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
Answer: 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
Answer: 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
Answer: 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
QUESTIONS WITH ACCURATE ANSWERS
GRADED A+
⩥ Butterfly valve: where can it be used?
Answer: Can be used on the inlet and outlet of a water pump
⩥ What electrical motor protection device automatically resets itself?
Answer: The thermal protector
⩥ 746 watts equals how many kilowatt hours?
Answer: .746 kilowatt hours
⩥ What position is the liquid line service valve normally in?
Answer: Back-seated
⩥ In an operating evaporator, oil stays on top of which refrigerant?
Answer: Carbon dioxide, R-744
⩥ At what pressure does the relief valve blow on a high pressure
machine?
Answer: 300 psi
,⩥ What would indicate a restriction (such as dirt or scale) in the liquid
line?
Answer: Frost immediately after the restriction
⩥ What does solubility mean?
Answer: The ability of a refrigerant to mix with other substances
⩥ Charging Vapor —In a compression system, where do you charge the
vapor?
Answer: 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:
Answer: 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:
Answer: Dry bulb and wet bulb temperature
⩥ To produce the desired evaporator temperature, the power input is
reduced by keeping head pressure...
Answer: Head pressure as low as possible & suction pressure as high as
needed
,⩥ The accumulator is usually between the...
Answer: Compressor and evaporator
⩥ An oiling system in a large centrifugal system should consist of at
least...
Answer: Reservoir, pump and distribution lines
⩥ In an evaporator that chills brine, the greatest cooling effect on the
brine results from the...
Answer: 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
Answer: 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
Answer: 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
Answer: 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
Answer: 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
