FDNY Q01/Q99 Written Exam 2026
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Rupture members, when used in parallel with a relief valve, are not to exceed _____%
above designed working pressure - ANSWERS-20%
The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
C) Nessler reagent
D) carbonate of soda - ANSWERS-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 - ANSWERS-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 - ANSWERS-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 -
ANSWERS-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 - ANSWERS-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 - ANSWERS-A) 7 to 10° F
The setting of a fusible plug is
A) 280° F
B) 300° F
C) 380° F
,D) 300 psig. - ANSWERS-A) 280° F
If the insulation was removed from the bulb of the expansion valve, what would
happen? - ANSWERS-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.
On the most common three-phase, four-wire service, the voltage between any phase
and neutral should be
A) 105 volts
B) 120 volts
C) 208 volts
D) 220 volts - ANSWERS-B) 120 volts
A refrigerant overcharge would
A) increase head pressure
B) decrease head pressure
C) decrease solution-side pressure
D) decrease discharge-side pressure - ANSWERS-A) increase head pressure
A dryer is generally installed with other equipment in a commercial Freon compressor
system. The recommended location of this dryer is on the
A) high-pressure line between condenser and reciever
B) suction line between evaporator and compressor
C) discharge line between compressor and condenser
D) liquid line between receiver and expansion valve - ANSWERS-D) liquid line between
receiver and expansion valve
R-22 —What does it smell like? - ANSWERS-Odorless
, Desirable characteristics of a refrigerant:
A) High __________
B) Low __________ - ANSWERS-A) High critical point
B) Low freezing point
Centrifugal Feed Water Pump
A) Start-up procedure
B) Shut-down procedure - ANSWERS-A) Start-up procedure
1) Lock-out, tag-out
2) Close discharge valve
3) Open suction valve
4) Turn on
5) Open discharge valve
B) Shut-down procedure
1) Lock-out, tag-out
2) close suction valve
3) close discharge valve
In order to vary the capacity of an absorption plant, you should regulate the.. -
ANSWERS-Flow of the water to the condenser
600,000 btu per hour equals how many tons of refrigeration?
A) 300
B) 3,000
C) 500
D) 50 - ANSWERS-D) 50
Heat transfer takes place by
A) evaporation, conduction and condensation
MOST Recent Tested,Actual Exam
Questions (2026) WITH Recent Newest
Verified And Well Analyzed Exam
Questions (Actual Exam 2026-2027)
Correct Detailed & Verified ANSWERS
(100% Accurate Solutions)||ALREADY
GRADED A+||Exam Guarantee Pass!!
Rupture members, when used in parallel with a relief valve, are not to exceed _____%
above designed working pressure - ANSWERS-20%
The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
C) Nessler reagent
D) carbonate of soda - ANSWERS-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 - ANSWERS-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 - ANSWERS-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 -
ANSWERS-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 - ANSWERS-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 - ANSWERS-A) 7 to 10° F
The setting of a fusible plug is
A) 280° F
B) 300° F
C) 380° F
,D) 300 psig. - ANSWERS-A) 280° F
If the insulation was removed from the bulb of the expansion valve, what would
happen? - ANSWERS-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.
On the most common three-phase, four-wire service, the voltage between any phase
and neutral should be
A) 105 volts
B) 120 volts
C) 208 volts
D) 220 volts - ANSWERS-B) 120 volts
A refrigerant overcharge would
A) increase head pressure
B) decrease head pressure
C) decrease solution-side pressure
D) decrease discharge-side pressure - ANSWERS-A) increase head pressure
A dryer is generally installed with other equipment in a commercial Freon compressor
system. The recommended location of this dryer is on the
A) high-pressure line between condenser and reciever
B) suction line between evaporator and compressor
C) discharge line between compressor and condenser
D) liquid line between receiver and expansion valve - ANSWERS-D) liquid line between
receiver and expansion valve
R-22 —What does it smell like? - ANSWERS-Odorless
, Desirable characteristics of a refrigerant:
A) High __________
B) Low __________ - ANSWERS-A) High critical point
B) Low freezing point
Centrifugal Feed Water Pump
A) Start-up procedure
B) Shut-down procedure - ANSWERS-A) Start-up procedure
1) Lock-out, tag-out
2) Close discharge valve
3) Open suction valve
4) Turn on
5) Open discharge valve
B) Shut-down procedure
1) Lock-out, tag-out
2) close suction valve
3) close discharge valve
In order to vary the capacity of an absorption plant, you should regulate the.. -
ANSWERS-Flow of the water to the condenser
600,000 btu per hour equals how many tons of refrigeration?
A) 300
B) 3,000
C) 500
D) 50 - ANSWERS-D) 50
Heat transfer takes place by
A) evaporation, conduction and condensation
