Q-01 FDNY EXAM WITH VERIFIED
QUESTIONS AND ANSWERS|| ALREADY
GRADED A+|| GUARANTEED PASS|| LATEST
UPDATE 2025
If purging does not occur in a refrigerating system, what is the result?
A) High-head pressure
B) Low condense pressure
C) Low head pressure
D) All of the above - ANSWER-A) High-head pressure
In a Freon refrigerating system in which all piping is made up of hard copper
fittings and streamlined "wrought"-type fittings, the joints should be
A) Screwed
B) Soldered or brazed
C) Flanged with ground faces
D) Flanged with lined rubber gaskets - ANSWER-B) Soldered or brazed
One effect of noncondensable gas in a system is
A) High suction pressure
B) Low suction pressure
C) High condenser pressure
D) Low condenser pressure - ANSWER-C) High condenser pressure
,The manometer measure
A) Pressure of vapors and gases
B) The difference in absolute temperature
C) Relative humidity
D) Dew point - ANSWER-A) Pressure of vapors and gases
To determine the refrigerant type on air-conditioning equipment, the technician
must
A) Read the equipment name plate
B) Read the expansion valve plate
C) Connect manifold gauges and compare the pressure
D) Pump down the system and take samples - ANSWER-A) Read the
equipment name plate
Chlorine-based refrigerants without hydrogen are so stable that they do not
break down in the lower atmosphere
A) Until 10 to 20 years after their release
B) Until 20 to 40 years after their release
C) Until 40 to 70 years after their release
D) Even after 100 years or more after being released - ANSWER-D) Even after
100 years or more after being released
The scale trap is located between the
A) Compressor and condenser
B) Condenser and receiver
C) Receiver and evaporator
D) Compressor and evaporator - ANSWER-D) Compressor and evaporator
,Relative humidity refers to the total moisture content of air. This statement is
A) is true
B) is false
C) is partly true
D) defines absolute humidity - ANSWER-A) is true
Which of the following is true?
A) Ammonia does not mix with oil and floats on top of oil
B) Carbon dioxide will not mix with oil and will float on top of oil
C) Oil floats on top of sulphur dioxide and the two do no mix
D) All of the above - ANSWER-D) All of the above
The solubility of refrigerant oil is lowest in
A) CO2
B) R-22
C) NH3
D) R-12 - ANSWER-A) CO2
In case of an accident with an ammonia absorption system, the
A) ammonia pump should immediately shut down
B) water supply to the condenser should be increased
C) steam to the generator should be shut off
D) absorber pressure should be removed or reduced by discharging it to the
sewer - ANSWER-C) steam to the generator should be shut off
In a lithium bromide absorption system producing chilled water, the lowest
possible temperature leaving the evaporator is
A) 31 F
, B) 33 F
C) 35 F
D) 38 F - ANSWER-D) 38 F
If brine becomes saturated with ammonia in a small compression plant, the
proper thing to do is
A) run the brine through the cooling tower and treat it with lime
B) treat the brine with lime
C) run it to the sewer and make a new batch
D) pay no attention to the problem since it will correct itself - ANSWER-C) run
it to the sewer and make a new batch
The main reason for purging a Freon centrifugal refrigerating system is to
remove
A) water lubricating oil
B) gaseous lubricating oil
C) noncondensable gas
D) water vapor - ANSWER-C) noncondensable gas
In an absorption system, refrigerant boils in the
A) absorber
B) evaporator
C) condenser
D) generator - ANSWER-B) evaporator
Purging a double=pipe condenser should be done from the
A) bottom, near the liquid refrigerant outlet
B) middle, on one of the bands
QUESTIONS AND ANSWERS|| ALREADY
GRADED A+|| GUARANTEED PASS|| LATEST
UPDATE 2025
If purging does not occur in a refrigerating system, what is the result?
A) High-head pressure
B) Low condense pressure
C) Low head pressure
D) All of the above - ANSWER-A) High-head pressure
In a Freon refrigerating system in which all piping is made up of hard copper
fittings and streamlined "wrought"-type fittings, the joints should be
A) Screwed
B) Soldered or brazed
C) Flanged with ground faces
D) Flanged with lined rubber gaskets - ANSWER-B) Soldered or brazed
One effect of noncondensable gas in a system is
A) High suction pressure
B) Low suction pressure
C) High condenser pressure
D) Low condenser pressure - ANSWER-C) High condenser pressure
,The manometer measure
A) Pressure of vapors and gases
B) The difference in absolute temperature
C) Relative humidity
D) Dew point - ANSWER-A) Pressure of vapors and gases
To determine the refrigerant type on air-conditioning equipment, the technician
must
A) Read the equipment name plate
B) Read the expansion valve plate
C) Connect manifold gauges and compare the pressure
D) Pump down the system and take samples - ANSWER-A) Read the
equipment name plate
Chlorine-based refrigerants without hydrogen are so stable that they do not
break down in the lower atmosphere
A) Until 10 to 20 years after their release
B) Until 20 to 40 years after their release
C) Until 40 to 70 years after their release
D) Even after 100 years or more after being released - ANSWER-D) Even after
100 years or more after being released
The scale trap is located between the
A) Compressor and condenser
B) Condenser and receiver
C) Receiver and evaporator
D) Compressor and evaporator - ANSWER-D) Compressor and evaporator
,Relative humidity refers to the total moisture content of air. This statement is
A) is true
B) is false
C) is partly true
D) defines absolute humidity - ANSWER-A) is true
Which of the following is true?
A) Ammonia does not mix with oil and floats on top of oil
B) Carbon dioxide will not mix with oil and will float on top of oil
C) Oil floats on top of sulphur dioxide and the two do no mix
D) All of the above - ANSWER-D) All of the above
The solubility of refrigerant oil is lowest in
A) CO2
B) R-22
C) NH3
D) R-12 - ANSWER-A) CO2
In case of an accident with an ammonia absorption system, the
A) ammonia pump should immediately shut down
B) water supply to the condenser should be increased
C) steam to the generator should be shut off
D) absorber pressure should be removed or reduced by discharging it to the
sewer - ANSWER-C) steam to the generator should be shut off
In a lithium bromide absorption system producing chilled water, the lowest
possible temperature leaving the evaporator is
A) 31 F
, B) 33 F
C) 35 F
D) 38 F - ANSWER-D) 38 F
If brine becomes saturated with ammonia in a small compression plant, the
proper thing to do is
A) run the brine through the cooling tower and treat it with lime
B) treat the brine with lime
C) run it to the sewer and make a new batch
D) pay no attention to the problem since it will correct itself - ANSWER-C) run
it to the sewer and make a new batch
The main reason for purging a Freon centrifugal refrigerating system is to
remove
A) water lubricating oil
B) gaseous lubricating oil
C) noncondensable gas
D) water vapor - ANSWER-C) noncondensable gas
In an absorption system, refrigerant boils in the
A) absorber
B) evaporator
C) condenser
D) generator - ANSWER-B) evaporator
Purging a double=pipe condenser should be done from the
A) bottom, near the liquid refrigerant outlet
B) middle, on one of the bands
