Q-01 FDNY EXAM Questions &
Answers | With 100% Correct
Complete Solutions || Already Graded
A + || 2026-2027 Latest Update!!!
Rupture members, when used in parallel with a relief valve, are not to
exceed _____% above designed working pressure - ANSWER-20%
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 opens 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
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 - 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 - 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
Answers | With 100% Correct
Complete Solutions || Already Graded
A + || 2026-2027 Latest Update!!!
Rupture members, when used in parallel with a relief valve, are not to
exceed _____% above designed working pressure - ANSWER-20%
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 opens 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
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 - 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 - 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
