FDNY Written Exam ACTUAL UPDATED Questions and CORRECT Answers
C
Terms in this set (230)
A more efficient centrifugal compressor operation results Lowering the condensing pressure
from
The heat removed from the refrigerant in a condenser is Sensible and latent heat
According to the New York City fire code, refrigerant Be approved by the US Department of Transportation
containers must
The cylinder unloader works by Keeping the suction valve opened while the compressor is in the return stroke
In most semi-hermetic compressors, the suction vapor is Cool the motor
used to
The amount of refrigerant that flows through the orifices Difference between the high side and low side pressure
of an economizer is determined by the
The installation of an inline refrigerant cleaning system is Remove impurities from the system
advisable to
The type of refrigerant system least likely to leak The indirect system
refrigerant into the building space is
The compression ratio for a reciprocating compressor 1.69
with a suction pressure of 65 PSIG and a discharge
pressure of 120 PSIG is closest to
A superheated vapor is Dry vapor above the saturation temperature
A condenser water pump cavitating is most likely caused A faulty cooling tower water level controller
by
A centrifugal water pump is known as a lift pump when The water supply to the pump suction inlet is below the pump level
A TXV is used to maintain constant Evaporator superheat
A chilled water supply of 55°F for human comfort is Too high for human comfort purpose
The packing gland of a centrifugal pump serves to Keep air out of the pumps when the impeller housing is under negative pressure
, Capacity control of a reciprocating hermetic compressor Operation of the hot gas bypass valve
is typically achieved through
The most important reason to sub-cool the refrigerant in A pure liquid refrigerant will enter the metering device
the condenser is to ensure that
If a compressor discharge temperature has dropped An expansion valve that is open too wide
significantly and the suction line pressure is high, this may
be caused by
A low side float valve is used to maintain The level of the refrigerant in the evaporator
The ASHRAE refrigerant safety classification indicating no A1
flammability and lower toxicity is
When an expansion valve is operating properly, the end Only superheated vapor
of the evaporator will contain
Information not contained in a Material Safety Data Sheet Cost of the material
(MSDS) includes
In a steam turbine, the Kingsbury thrust bearing functions Maintain axial positioning of the rotor shaft
to
A centrifugal water pump is considered fully primed The pump is full of liquid
when
To avoid collapsing tubing when making bends, a Lever type tubing bender
refrigerant engineer should use
A reciprocating compressor making a clicking sound Slugging of the liquid refrigerant
during operation, if not caused by worn parts, is
probably due to
For a refrigerant to become superheated, it must be Where no liquid refrigerant is present
heated in a section of the low side refrigerant line
After all liquid refrigerant has been recovered, the Should not be opened until all vapor has been recovered
system
The removal rate of refrigerant using a portable The vapor density is decreasing
compressor recovery unit gradually slows down because
If the water level in all cooling tower cells is very low, the Add additional makeup water to the cooling tower
immediate action should be to
The height of the water column, in feet, with a pressure 323 feet
gauge reading 140 PSIG is closest to
C
Terms in this set (230)
A more efficient centrifugal compressor operation results Lowering the condensing pressure
from
The heat removed from the refrigerant in a condenser is Sensible and latent heat
According to the New York City fire code, refrigerant Be approved by the US Department of Transportation
containers must
The cylinder unloader works by Keeping the suction valve opened while the compressor is in the return stroke
In most semi-hermetic compressors, the suction vapor is Cool the motor
used to
The amount of refrigerant that flows through the orifices Difference between the high side and low side pressure
of an economizer is determined by the
The installation of an inline refrigerant cleaning system is Remove impurities from the system
advisable to
The type of refrigerant system least likely to leak The indirect system
refrigerant into the building space is
The compression ratio for a reciprocating compressor 1.69
with a suction pressure of 65 PSIG and a discharge
pressure of 120 PSIG is closest to
A superheated vapor is Dry vapor above the saturation temperature
A condenser water pump cavitating is most likely caused A faulty cooling tower water level controller
by
A centrifugal water pump is known as a lift pump when The water supply to the pump suction inlet is below the pump level
A TXV is used to maintain constant Evaporator superheat
A chilled water supply of 55°F for human comfort is Too high for human comfort purpose
The packing gland of a centrifugal pump serves to Keep air out of the pumps when the impeller housing is under negative pressure
, Capacity control of a reciprocating hermetic compressor Operation of the hot gas bypass valve
is typically achieved through
The most important reason to sub-cool the refrigerant in A pure liquid refrigerant will enter the metering device
the condenser is to ensure that
If a compressor discharge temperature has dropped An expansion valve that is open too wide
significantly and the suction line pressure is high, this may
be caused by
A low side float valve is used to maintain The level of the refrigerant in the evaporator
The ASHRAE refrigerant safety classification indicating no A1
flammability and lower toxicity is
When an expansion valve is operating properly, the end Only superheated vapor
of the evaporator will contain
Information not contained in a Material Safety Data Sheet Cost of the material
(MSDS) includes
In a steam turbine, the Kingsbury thrust bearing functions Maintain axial positioning of the rotor shaft
to
A centrifugal water pump is considered fully primed The pump is full of liquid
when
To avoid collapsing tubing when making bends, a Lever type tubing bender
refrigerant engineer should use
A reciprocating compressor making a clicking sound Slugging of the liquid refrigerant
during operation, if not caused by worn parts, is
probably due to
For a refrigerant to become superheated, it must be Where no liquid refrigerant is present
heated in a section of the low side refrigerant line
After all liquid refrigerant has been recovered, the Should not be opened until all vapor has been recovered
system
The removal rate of refrigerant using a portable The vapor density is decreasing
compressor recovery unit gradually slows down because
If the water level in all cooling tower cells is very low, the Add additional makeup water to the cooling tower
immediate action should be to
The height of the water column, in feet, with a pressure 323 feet
gauge reading 140 PSIG is closest to
