Q-01 FDNY EXAM 3 COMPREHENSIVE
FIREFIGHTER STUDY GUIDE 2026
◉ 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?
FIREFIGHTER STUDY GUIDE 2026
◉ 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?
