FDNY Q01/Q99 Written EXAM Questions with 100% Correct
Answers | Verified | Updated (Actual Exam) 2026
A desirable property of ammonia refrigerant oil is
(A) high paraffin content.
(B) being free of water.
(C) very low flashpoint.
(D) all of the above.
(B) being free of water.
Relative humidity refers to the total moisture content of air. This statement
(A) is true.
(B) is false.
(C) is partly true.
(D) defines absolute humidity.
(A) is true.
,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) 380° F
D) 300 psig.
A) 280° F
If the insulation was removed from the bulb of the expansion valve, what
would happen?
Flooded evaporator —the TXV bulb opens in a range from 45 to 85° F. If the
insulation was removed, the bulb would sense the temperature in the
machine room and keep the TXV open, thus flooding the evaporator.
Answers | Verified | Updated (Actual Exam) 2026
A desirable property of ammonia refrigerant oil is
(A) high paraffin content.
(B) being free of water.
(C) very low flashpoint.
(D) all of the above.
(B) being free of water.
Relative humidity refers to the total moisture content of air. This statement
(A) is true.
(B) is false.
(C) is partly true.
(D) defines absolute humidity.
(A) is true.
,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) 380° F
D) 300 psig.
A) 280° F
If the insulation was removed from the bulb of the expansion valve, what
would happen?
Flooded evaporator —the TXV bulb opens in a range from 45 to 85° F. If the
insulation was removed, the bulb would sense the temperature in the
machine room and keep the TXV open, thus flooding the evaporator.
