NYC RMO UPDATED FINAL EXAM QUESTIONS
AND CORRECT ANSWERS
The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the
following, a more efficient centrifugal compressor operation results from
a. Raising the condenser liquid level to the maximum
b. lowering the chilled water set point.
c. raising the condenser head pressure
d. lowering the condenser pressure - CORRECT ANSWERS Lowering the condensing
pressure
The heat removed from the refrigerant in a condenser is
a. sensible and latent heat
b. latent heat only
c. radiant heat only
d. sensible heat only - CORRECT ANSWERS sensible and latent heat
The refrigerant unit that you have been assigned to is being taken out of service for major
repair. You have been assigned to withdraw refrigerant from storage in suitable containers.
According to the NYC fire code, you must ensure that the containers
a. do not weigh more than 200lbs when filled
b. Are approved by the US Department of Transportation (DOT)
c. are approved by the OSHA association
d. do not exceed 55 gallon in capacity - CORRECT ANSWERS Are approved by the US
Department of Transportation (DOT)
, Which of the following best describes how the cylinder unloader work?
a. Keep in the suction valve opened while the compressor is in the return stroke.
b. controls the clearance volume in the compressor with a solenoid
c. controls the opening of the passage into the compressor with variable vanes
d. unloads the pistons to create less pressure - CORRECT ANSWERS Keep in the suction
valve opened while the compressor is in the return stroke.
In most semi hermetic compressors, the suction vapor is used to - CORRECT
ANSWERS Cools the motor
The amount of refrigerant that flows through the orifices of an economizer is determined by the
- CORRECT ANSWERS Difference between the high side and low side pressure
The installation of an inline refrigerant cleaning system is advisable - CORRECT
ANSWERS To remove impurities in the system
The type of refrigerant system that is least likely to leak refrigerant into the building space that
are being cooled are - CORRECT ANSWERS Indirect systems
The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this
compressor is 120 PSIG. The atmospheric is 14.7PSI. the compression ratio for the given
condition is closest to: - CORRECT ANSWERS 1.69 (PSIG+14.7) Then divide both PSIG to
get ratio
A superheated vappr is a - CORRECT ANSWERS dry vapor above the saturation
temperature
AND CORRECT ANSWERS
The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the
following, a more efficient centrifugal compressor operation results from
a. Raising the condenser liquid level to the maximum
b. lowering the chilled water set point.
c. raising the condenser head pressure
d. lowering the condenser pressure - CORRECT ANSWERS Lowering the condensing
pressure
The heat removed from the refrigerant in a condenser is
a. sensible and latent heat
b. latent heat only
c. radiant heat only
d. sensible heat only - CORRECT ANSWERS sensible and latent heat
The refrigerant unit that you have been assigned to is being taken out of service for major
repair. You have been assigned to withdraw refrigerant from storage in suitable containers.
According to the NYC fire code, you must ensure that the containers
a. do not weigh more than 200lbs when filled
b. Are approved by the US Department of Transportation (DOT)
c. are approved by the OSHA association
d. do not exceed 55 gallon in capacity - CORRECT ANSWERS Are approved by the US
Department of Transportation (DOT)
, Which of the following best describes how the cylinder unloader work?
a. Keep in the suction valve opened while the compressor is in the return stroke.
b. controls the clearance volume in the compressor with a solenoid
c. controls the opening of the passage into the compressor with variable vanes
d. unloads the pistons to create less pressure - CORRECT ANSWERS Keep in the suction
valve opened while the compressor is in the return stroke.
In most semi hermetic compressors, the suction vapor is used to - CORRECT
ANSWERS Cools the motor
The amount of refrigerant that flows through the orifices of an economizer is determined by the
- CORRECT ANSWERS Difference between the high side and low side pressure
The installation of an inline refrigerant cleaning system is advisable - CORRECT
ANSWERS To remove impurities in the system
The type of refrigerant system that is least likely to leak refrigerant into the building space that
are being cooled are - CORRECT ANSWERS Indirect systems
The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this
compressor is 120 PSIG. The atmospheric is 14.7PSI. the compression ratio for the given
condition is closest to: - CORRECT ANSWERS 1.69 (PSIG+14.7) Then divide both PSIG to
get ratio
A superheated vappr is a - CORRECT ANSWERS dry vapor above the saturation
temperature
