Q-01 FDNY UPDATED EXAM 2025
COMPLETE MULTIPLE CHOICE
QUESTION BANK WITH VERIFIED
ANSWERS,DETAILED EXPLANATIONS
AND 100% GUARANTEE PASS A+ GRADE
(LATEST EDITION!!!!!!!)
Charging Vapor —In a compression system, where do you
charge the vapor? - THE CORRECT 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: - THE CORRECT 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: - THE CORRECT ANSWER-Dry bulb and wet
bulb temperature
To produce the desired evaporator temperature, the power
input is reduced by keeping head pressure... - THE CORRECT ANSWER-
Head pressure as low as possible & suction pressure as high as
needed
The accumulator is usually between the... - THE CORRECT ANSWER-
Compressor and evaporator
,An oiling system in a large centrifugal system should consist of
at least... - THE CORRECT ANSWER-Reservoir, pump and distribution
lines
In an evaporator that chills brine, the greatest cooling effect on
the brine results from the... - THE CORRECT 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 - THE CORRECT 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 - THE CORRECT 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 - THE CORRECT 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 - THE CORRECT 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
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 - THE CORRECT ANSWER-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 - THE CORRECT ANSWER-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 - THE CORRECT ANSWER-A) 7 to 10° F
The setting of a fusible plug is
A) 280° F
B) 300° F
C) 380° F
D) 300 psig. - THE CORRECT ANSWER-A) 280° F
If the insulation was removed from the bulb of the expansion
valve, what would happen? - THE CORRECT ANSWER-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
COMPLETE MULTIPLE CHOICE
QUESTION BANK WITH VERIFIED
ANSWERS,DETAILED EXPLANATIONS
AND 100% GUARANTEE PASS A+ GRADE
(LATEST EDITION!!!!!!!)
Charging Vapor —In a compression system, where do you
charge the vapor? - THE CORRECT 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: - THE CORRECT 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: - THE CORRECT ANSWER-Dry bulb and wet
bulb temperature
To produce the desired evaporator temperature, the power
input is reduced by keeping head pressure... - THE CORRECT ANSWER-
Head pressure as low as possible & suction pressure as high as
needed
The accumulator is usually between the... - THE CORRECT ANSWER-
Compressor and evaporator
,An oiling system in a large centrifugal system should consist of
at least... - THE CORRECT ANSWER-Reservoir, pump and distribution
lines
In an evaporator that chills brine, the greatest cooling effect on
the brine results from the... - THE CORRECT 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 - THE CORRECT 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 - THE CORRECT 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 - THE CORRECT 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 - THE CORRECT 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
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 - THE CORRECT ANSWER-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 - THE CORRECT ANSWER-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 - THE CORRECT ANSWER-A) 7 to 10° F
The setting of a fusible plug is
A) 280° F
B) 300° F
C) 380° F
D) 300 psig. - THE CORRECT ANSWER-A) 280° F
If the insulation was removed from the bulb of the expansion
valve, what would happen? - THE CORRECT ANSWER-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
