age 1 of 59
m. m. m.
FDNY Z-51 REFRIGERATION EXAM m. m. m.
Efficiency of the refrigerant cycle is affected by the operations of
m. m. m. m. m. m. m. m. m. m.
m. the condenser. Of the following, a more efficient centrifugal
m. m. m. m. m. m. m. m.
m. compressor operation results from: .......Answer.........Lowering the
m. m. m. m. m.
m. condensing pressure m.
The heat removed from the refrigerant in a condenser is:
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.......Answer.........Sensible and latent heat m. m. m.
The refrigerant unit that you have been assigned to is being taken
m. m. m. m. m. m. m. m. m. m. m.
out of service for a major repair. You have been assigned to
m. m. m. m. m. m. m. m. m. m. m. m.
m. withdraw refrigerant for storage in suitable containers.
m. m. m. m. m. m.
According to the NYC Fire Code, you must ensure that the
m. m. m. m. m. m. m. m. m. m.
m. containers: .......Answer.........Are approved by the US Dept. of
m. m. m. m. m. m. m.
m. Transportation
,age 2 of 59
m. m. m.
Which of the following best describes how the cylinder unloader
m. m. m. m. m. m. m. m. m.
works? .......Answer.........Keep in the suction valve opened while
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the compressor is in the return stroke
m. m. m. m. m. m. m.
In most semi-hermetic compressors, the suction vapor is used to:
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.......Answer.........Cool the motor m. m.
The amount of refrigerant that flows through the orifices of an
m. m. m. m. m. m. m. m. m. m.
economizer is determined by the: .......Answer. ........ Differences
m. m. m. m. m. m.
between the high side and low side pressure
m. m. m. m. m. m. m.
The installation of an inline refrigerant cleaning system is
m. m. m. m. m. m. m. m.
advisable: .......Answer.........To remove impurities from the system
m. m. m. m. m. m. m.
The type of refrigerant system that is least likely to leak
m. m. m. m. m. m. m. m. m. m.
refrigerant into the building space that are being cooled:
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.......Answer.........Indirect system m.
,age 3 of 59
m. m. m.
The suction pressure of a reciprocating compressor is 65 PSIG.
m. m. m. m. m. m. m. m. m.
The discharge pressure of this compressor is 120 PSIG. The
m. m. m. m. m. m. m. m. m. m.
atmospheric is 14.7 PSI. The compression ratio for the given
m. m. m. m. m. m. m. m. m. m.
condition is closest to: .......Answer. ....... 1.69
m. m. m. m. m.
A superheated vapor is: .......Answer.........Dry vapor above the
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saturation temperature
m. m.
A refrigerant engineer verifies that a condenser water pump is
m. m. m. m. m. m. m. m. m.
cavitating. Of the following, the most likely cause for this condition
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is: .......Answer.........A faulty cooling tower water level controller
m. m. m. m. m. m. m. m.
A centrifugal water pump is known as a lift pump when the:
m. m. m. m. m. m. m. m. m. m. m.
.......Answer.........The water supply to the pump suction inlet is below m. m. m. m. m. m. m. m. m.
the pump level
m. m. m.
, age 4 of 59 m. m. m.
A TXV is used to maintain constant: .......Answer....... Evaporator
m.m. m.m. m.m. m.m. m.m. m.m. m.m.
superheat
The chilled water supply to the building is 55 deg F. If the
m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. chiller is being used for human comfort, should you be
m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. concerned about this, and why? .......Answer.........Yes, this temp
m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. is too high for human comfort purposes
m.m. m.m. m.m. m.m. m.m. m.m.
The packing gland of a centrifugal pump serves to:
m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m.
.......Answer.........The drip part of the packing gland gives m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. evidence that there is water in the pump m.m. m.m. m.m. m.m. m.m. m.m. m.m.
Capacity control of reciprocating hermetic compressor is
m.m. m.m. m.m. m.m. m.m. m.m.
m.m. typically achieved through: .......Answer.........Operation of the
m.m. m.m. m.m. m.m. m.m.
hot gas bypass valve
m.m. m.m. m.m. m.m.
m. m. m.
FDNY Z-51 REFRIGERATION EXAM m. m. m.
Efficiency of the refrigerant cycle is affected by the operations of
m. m. m. m. m. m. m. m. m. m.
m. the condenser. Of the following, a more efficient centrifugal
m. m. m. m. m. m. m. m.
m. compressor operation results from: .......Answer.........Lowering the
m. m. m. m. m.
m. condensing pressure m.
The heat removed from the refrigerant in a condenser is:
m. m. m. m. m. m. m. m. m.
.......Answer.........Sensible and latent heat m. m. m.
The refrigerant unit that you have been assigned to is being taken
m. m. m. m. m. m. m. m. m. m. m.
out of service for a major repair. You have been assigned to
m. m. m. m. m. m. m. m. m. m. m. m.
m. withdraw refrigerant for storage in suitable containers.
m. m. m. m. m. m.
According to the NYC Fire Code, you must ensure that the
m. m. m. m. m. m. m. m. m. m.
m. containers: .......Answer.........Are approved by the US Dept. of
m. m. m. m. m. m. m.
m. Transportation
,age 2 of 59
m. m. m.
Which of the following best describes how the cylinder unloader
m. m. m. m. m. m. m. m. m.
works? .......Answer.........Keep in the suction valve opened while
m. m. m. m. m. m. m. m.
the compressor is in the return stroke
m. m. m. m. m. m. m.
In most semi-hermetic compressors, the suction vapor is used to:
m. m. m. m. m. m. m. m. m.
.......Answer.........Cool the motor m. m.
The amount of refrigerant that flows through the orifices of an
m. m. m. m. m. m. m. m. m. m.
economizer is determined by the: .......Answer. ........ Differences
m. m. m. m. m. m.
between the high side and low side pressure
m. m. m. m. m. m. m.
The installation of an inline refrigerant cleaning system is
m. m. m. m. m. m. m. m.
advisable: .......Answer.........To remove impurities from the system
m. m. m. m. m. m. m.
The type of refrigerant system that is least likely to leak
m. m. m. m. m. m. m. m. m. m.
refrigerant into the building space that are being cooled:
m. m. m. m. m. m. m. m. m.
.......Answer.........Indirect system m.
,age 3 of 59
m. m. m.
The suction pressure of a reciprocating compressor is 65 PSIG.
m. m. m. m. m. m. m. m. m.
The discharge pressure of this compressor is 120 PSIG. The
m. m. m. m. m. m. m. m. m. m.
atmospheric is 14.7 PSI. The compression ratio for the given
m. m. m. m. m. m. m. m. m. m.
condition is closest to: .......Answer. ....... 1.69
m. m. m. m. m.
A superheated vapor is: .......Answer.........Dry vapor above the
m. m. m. m. m. m. m.
saturation temperature
m. m.
A refrigerant engineer verifies that a condenser water pump is
m. m. m. m. m. m. m. m. m.
cavitating. Of the following, the most likely cause for this condition
m. m. m. m. m. m. m. m. m. m. m.
is: .......Answer.........A faulty cooling tower water level controller
m. m. m. m. m. m. m. m.
A centrifugal water pump is known as a lift pump when the:
m. m. m. m. m. m. m. m. m. m. m.
.......Answer.........The water supply to the pump suction inlet is below m. m. m. m. m. m. m. m. m.
the pump level
m. m. m.
, age 4 of 59 m. m. m.
A TXV is used to maintain constant: .......Answer....... Evaporator
m.m. m.m. m.m. m.m. m.m. m.m. m.m.
superheat
The chilled water supply to the building is 55 deg F. If the
m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. chiller is being used for human comfort, should you be
m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. concerned about this, and why? .......Answer.........Yes, this temp
m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. is too high for human comfort purposes
m.m. m.m. m.m. m.m. m.m. m.m.
The packing gland of a centrifugal pump serves to:
m.m. m.m. m.m. m.m. m.m. m.m. m.m. m.m.
.......Answer.........The drip part of the packing gland gives m.m. m.m. m.m. m.m. m.m. m.m. m.m.
m.m. evidence that there is water in the pump m.m. m.m. m.m. m.m. m.m. m.m. m.m.
Capacity control of reciprocating hermetic compressor is
m.m. m.m. m.m. m.m. m.m. m.m.
m.m. typically achieved through: .......Answer.........Operation of the
m.m. m.m. m.m. m.m. m.m.
hot gas bypass valve
m.m. m.m. m.m. m.m.
