1|Page
A-49 FDNY Test/Exam ||Verified Exam!!!|| Most Recent
Exam Actual Complete Real Exam Questions And
Correct Answers (Verified Answers) Already Graded
A+ | Guaranteed Success!! Newest Exam!!!
The compression ratio for a reciprocating compressor with
a suction pressure of 65 PSIG and a discharge pressure
of 120 PSIG is closest to - Answer-1.69
A superheated vapor is - Answer-Dry vapor above the
saturation temperature
A condenser water pump cavitating is most likely caused
by - Answer-A faulty cooling tower water level controller
A centrifugal water pump is known as a lift pump when -
Answer-The water supply to the pump suction inlet is
below the pump level
A TXV is used to maintain constant - Answer-Evaporator
superheat
,2|Page
A chilled water supply of 55°F for human comfort is -
Answer-Too high for human comfort purpose
The packing gland of a centrifugal pump serves to -
Answer-Keep air out of the pumps when the impeller
housing is under negative pressure
Capacity control of a reciprocating hermetic compressor is
typically achieved through - Answer-Operation of the hot
gas bypass valve
The most important reason to sub-cool the refrigerant in
the condenser is to ensure that - Answer-A pure liquid
refrigerant will enter the metering device
If a compressor discharge temperature has dropped
significantly and the suction line pressure is high, this may
be caused by - Answer-An expansion valve that is open
too wide
A low side float valve is used to maintain - Answer-The
level of the refrigerant in the evaporator
,3|Page
The ASHRAE refrigerant safety classification indicating no
flammability and lower toxicity is - Answer-A1
When an expansion valve is operating properly, the end of
the evaporator will contain - Answer-Only superheated
vapor
Information not contained in a Material Safety Data Sheet
(MSDS) includes - Answer-Cost of the material
In a steam turbine, the Kingsbury thrust bearing functions
to - Answer-Maintain axial positioning of the rotor shaft
A more efficient centrifugal compressor operation results
from - Answer-Lowering the condensing pressure
The heat removed from the refrigerant in a condenser is -
Answer-Sensible and latent heat
According to the New York City fire code, refrigerant
containers must - Answer-Be approved by the US
Department of Transportation
, 4|Page
The cylinder unloader works by - Answer-Keeping the
suction valve opened while the compressor is in the return
stroke
In most semi-hermetic compressors, the suction vapor is
used to - Answer-Cool the motor
The amount of refrigerant that flows through the orifices of
an economizer is determined by the - Answer-Difference
between the high side and low side pressure
The installation of an inline refrigerant cleaning system is
advisable to - Answer-Remove impurities from the system
The type of refrigerant system least likely to leak
refrigerant into the building space is - Answer-The indirect
system
A centrifugal water pump is considered fully primed when -
Answer-The pump is full of liquid
A-49 FDNY Test/Exam ||Verified Exam!!!|| Most Recent
Exam Actual Complete Real Exam Questions And
Correct Answers (Verified Answers) Already Graded
A+ | Guaranteed Success!! Newest Exam!!!
The compression ratio for a reciprocating compressor with
a suction pressure of 65 PSIG and a discharge pressure
of 120 PSIG is closest to - Answer-1.69
A superheated vapor is - Answer-Dry vapor above the
saturation temperature
A condenser water pump cavitating is most likely caused
by - Answer-A faulty cooling tower water level controller
A centrifugal water pump is known as a lift pump when -
Answer-The water supply to the pump suction inlet is
below the pump level
A TXV is used to maintain constant - Answer-Evaporator
superheat
,2|Page
A chilled water supply of 55°F for human comfort is -
Answer-Too high for human comfort purpose
The packing gland of a centrifugal pump serves to -
Answer-Keep air out of the pumps when the impeller
housing is under negative pressure
Capacity control of a reciprocating hermetic compressor is
typically achieved through - Answer-Operation of the hot
gas bypass valve
The most important reason to sub-cool the refrigerant in
the condenser is to ensure that - Answer-A pure liquid
refrigerant will enter the metering device
If a compressor discharge temperature has dropped
significantly and the suction line pressure is high, this may
be caused by - Answer-An expansion valve that is open
too wide
A low side float valve is used to maintain - Answer-The
level of the refrigerant in the evaporator
,3|Page
The ASHRAE refrigerant safety classification indicating no
flammability and lower toxicity is - Answer-A1
When an expansion valve is operating properly, the end of
the evaporator will contain - Answer-Only superheated
vapor
Information not contained in a Material Safety Data Sheet
(MSDS) includes - Answer-Cost of the material
In a steam turbine, the Kingsbury thrust bearing functions
to - Answer-Maintain axial positioning of the rotor shaft
A more efficient centrifugal compressor operation results
from - Answer-Lowering the condensing pressure
The heat removed from the refrigerant in a condenser is -
Answer-Sensible and latent heat
According to the New York City fire code, refrigerant
containers must - Answer-Be approved by the US
Department of Transportation
, 4|Page
The cylinder unloader works by - Answer-Keeping the
suction valve opened while the compressor is in the return
stroke
In most semi-hermetic compressors, the suction vapor is
used to - Answer-Cool the motor
The amount of refrigerant that flows through the orifices of
an economizer is determined by the - Answer-Difference
between the high side and low side pressure
The installation of an inline refrigerant cleaning system is
advisable to - Answer-Remove impurities from the system
The type of refrigerant system least likely to leak
refrigerant into the building space is - Answer-The indirect
system
A centrifugal water pump is considered fully primed when -
Answer-The pump is full of liquid
