Refrigeration Exam 1 questions with |\ |\ |\ |\ |\
answers
efficiency of the refrigerant cycle is affected by the operations of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the condenser. Of the following, a more efficient centrifugal
|\ |\ |\ |\ |\ |\ |\ |\ |\
compressor operation results from: - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔Lowering the condensing pressure |\ |\ |\
The heat removed from the refrigerant in a condenser is: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔sensible and latent heat |\ |\ |\ |\ |\
The refrigerant unit that you have been assigned to is being
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
taken out of service for a major repair. You have been assigned to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
withdraw refrigerant for storage in suitable containers. According
|\ |\ |\ |\ |\ |\ |\ |\
to the NYC fire code, you must ensure that the containers: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Are approved by the US Dept. of |\ |\ |\ |\ |\ |\ |\ |\ |\
Transportation
which of the following best describes how the cylinder unloader
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
work? - 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 |\ |\ |\ |\ |\ |\ |\ |\
✔✔differences between the high side and low side pressure |\ |\ |\ |\ |\ |\ |\ |\
,the installation of an inline refrigerant cleaning system is
|\ |\ |\ |\ |\ |\ |\ |\ |\
advisable: - CORRECT ANSWERS ✔✔to remove impurities from
|\ |\ |\ |\ |\ |\ |\ |\
the system
|\
the type of refrigerant system that is least likely to leak
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
refrigerant into the building space that are being cooled: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔the indirect system
|\ |\ |\ |\
the suction pressure of a reciprocating compressor is 65 PSIG.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
The discharge pressure of this compressor is 120 PSIG. The
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
atmospheric is 14.7 PSI. the compression ratio for the given |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
condition is closest to: - CORRECT ANSWERS ✔✔1.69
|\ |\ |\ |\ |\ |\ |\
a superheated vapor is: - CORRECT ANSWERS ✔✔dry vapor
|\ |\ |\ |\ |\ |\ |\ |\ |\
above the saturation temperature
|\ |\ |\
a refrigerant engineer veritifies that a condenser water pump is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cavitating. Of the following, the most likely cause for this
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
condition is: - CORRECT ANSWERS ✔✔a faulty cooling tower
|\ |\ |\ |\ |\ |\ |\ |\ |\
water level controller
|\ |\
a centrifugal water pump is known as a lift pump when the: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔the water supply to the pump suction
|\ |\ |\ |\ |\ |\ |\ |\ |\
inlet is below the pump level
|\ |\ |\ |\ |\
a TXV is used to maintain constant: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔evaporator superheat |\
,the chilled water supply to the building is 55F. If the chiller is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
being used for human comfort, should you be concerned about
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
this, and why? - CORRECT ANSWERS ✔✔Yes, this temp is too high
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
for human comfort purpose
|\ |\ |\ |\
the packing gland of a centrifugal pump serves to: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔the drip part of the packing gland gives evidence
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
that there is water in the pump
|\ |\ |\ |\ |\ |\
capacity control of reciprocating hermetic compressor is typically
|\ |\ |\ |\ |\ |\ |\ |\
achieved through - CORRECT ANSWERS ✔✔operation of the hot
|\ |\ |\ |\ |\ |\ |\ |\ |\
gas bypass valve
|\ |\
the most important reason to sub-cool the refrigerant in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
condenser is to ensure that: - CORRECT ANSWERS ✔✔a pure
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
liquid refrigerant will enter the metering device
|\ |\ |\ |\ |\ |\
A refrigeration engineer is logging readings from a reciprocating
|\ |\ |\ |\ |\ |\ |\ |\ |\
system. Compressor discharge temperature have dropped
|\ |\ |\ |\ |\ |\
significantly and the suction line pressure is high. Which of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
following that may be causing this set of condition? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔an expansion valve that is open to wide
|\ |\ |\ |\ |\ |\ |\ |\
a low side float valve is used to maintain: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔the level of the refrigerant in the evaporator
|\ |\ |\ |\ |\ |\ |\
, regarding fire safety, which ASHRAE refrigerant safety
|\ |\ |\ |\ |\ |\ |\
classification indicates no flammability and lower toxicity? - |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔A1 |\ |\
when an expansion valve is operating properly, at the end of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
evaporator will contain: - CORRECT ANSWERS ✔✔only |\ |\ |\ |\ |\ |\ |\
superheated vapor |\
what information is not contained in a Material Safety Data
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Sheet-MSDS? - CORRECT ANSWERS ✔✔cost of the material |\ |\ |\ |\ |\ |\ |\
in a steam turbine, what is the function of the Kingsbury thrust
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
bearing? - CORRECT ANSWERS ✔✔maintain axial positioning of
|\ |\ |\ |\ |\ |\ |\ |\
the rotor shaft|\ |\
a centrifugal water pump is considered to the fully primed when -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔the pump is full of liquid
|\ |\ |\ |\ |\ |\ |\ |\
Copper tubing refrigerant lines must be installed for a new
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
system. It is a well known service practice that tubing collapses
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
at bends that must be made, the refrigerant engineer should use
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔level type tubing bender
|\ |\ |\ |\ |\ |\ |\
A reciprocating compressor is making a knocking sound during
|\ |\ |\ |\ |\ |\ |\ |\ |\
operation. If the refrigerant worn parts are not causing the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
knocking, what is the probably the cause? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔the slugging of the liquid refrigerant
|\ |\ |\ |\ |\
answers
efficiency of the refrigerant cycle is affected by the operations of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the condenser. Of the following, a more efficient centrifugal
|\ |\ |\ |\ |\ |\ |\ |\ |\
compressor operation results from: - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔Lowering the condensing pressure |\ |\ |\
The heat removed from the refrigerant in a condenser is: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔sensible and latent heat |\ |\ |\ |\ |\
The refrigerant unit that you have been assigned to is being
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
taken out of service for a major repair. You have been assigned to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
withdraw refrigerant for storage in suitable containers. According
|\ |\ |\ |\ |\ |\ |\ |\
to the NYC fire code, you must ensure that the containers: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Are approved by the US Dept. of |\ |\ |\ |\ |\ |\ |\ |\ |\
Transportation
which of the following best describes how the cylinder unloader
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
work? - 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 |\ |\ |\ |\ |\ |\ |\ |\
✔✔differences between the high side and low side pressure |\ |\ |\ |\ |\ |\ |\ |\
,the installation of an inline refrigerant cleaning system is
|\ |\ |\ |\ |\ |\ |\ |\ |\
advisable: - CORRECT ANSWERS ✔✔to remove impurities from
|\ |\ |\ |\ |\ |\ |\ |\
the system
|\
the type of refrigerant system that is least likely to leak
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
refrigerant into the building space that are being cooled: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔the indirect system
|\ |\ |\ |\
the suction pressure of a reciprocating compressor is 65 PSIG.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
The discharge pressure of this compressor is 120 PSIG. The
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
atmospheric is 14.7 PSI. the compression ratio for the given |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
condition is closest to: - CORRECT ANSWERS ✔✔1.69
|\ |\ |\ |\ |\ |\ |\
a superheated vapor is: - CORRECT ANSWERS ✔✔dry vapor
|\ |\ |\ |\ |\ |\ |\ |\ |\
above the saturation temperature
|\ |\ |\
a refrigerant engineer veritifies that a condenser water pump is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cavitating. Of the following, the most likely cause for this
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
condition is: - CORRECT ANSWERS ✔✔a faulty cooling tower
|\ |\ |\ |\ |\ |\ |\ |\ |\
water level controller
|\ |\
a centrifugal water pump is known as a lift pump when the: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔the water supply to the pump suction
|\ |\ |\ |\ |\ |\ |\ |\ |\
inlet is below the pump level
|\ |\ |\ |\ |\
a TXV is used to maintain constant: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔evaporator superheat |\
,the chilled water supply to the building is 55F. If the chiller is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
being used for human comfort, should you be concerned about
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
this, and why? - CORRECT ANSWERS ✔✔Yes, this temp is too high
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
for human comfort purpose
|\ |\ |\ |\
the packing gland of a centrifugal pump serves to: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔the drip part of the packing gland gives evidence
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
that there is water in the pump
|\ |\ |\ |\ |\ |\
capacity control of reciprocating hermetic compressor is typically
|\ |\ |\ |\ |\ |\ |\ |\
achieved through - CORRECT ANSWERS ✔✔operation of the hot
|\ |\ |\ |\ |\ |\ |\ |\ |\
gas bypass valve
|\ |\
the most important reason to sub-cool the refrigerant in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
condenser is to ensure that: - CORRECT ANSWERS ✔✔a pure
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
liquid refrigerant will enter the metering device
|\ |\ |\ |\ |\ |\
A refrigeration engineer is logging readings from a reciprocating
|\ |\ |\ |\ |\ |\ |\ |\ |\
system. Compressor discharge temperature have dropped
|\ |\ |\ |\ |\ |\
significantly and the suction line pressure is high. Which of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
following that may be causing this set of condition? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔an expansion valve that is open to wide
|\ |\ |\ |\ |\ |\ |\ |\
a low side float valve is used to maintain: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔the level of the refrigerant in the evaporator
|\ |\ |\ |\ |\ |\ |\
, regarding fire safety, which ASHRAE refrigerant safety
|\ |\ |\ |\ |\ |\ |\
classification indicates no flammability and lower toxicity? - |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔A1 |\ |\
when an expansion valve is operating properly, at the end of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
evaporator will contain: - CORRECT ANSWERS ✔✔only |\ |\ |\ |\ |\ |\ |\
superheated vapor |\
what information is not contained in a Material Safety Data
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Sheet-MSDS? - CORRECT ANSWERS ✔✔cost of the material |\ |\ |\ |\ |\ |\ |\
in a steam turbine, what is the function of the Kingsbury thrust
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
bearing? - CORRECT ANSWERS ✔✔maintain axial positioning of
|\ |\ |\ |\ |\ |\ |\ |\
the rotor shaft|\ |\
a centrifugal water pump is considered to the fully primed when -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔the pump is full of liquid
|\ |\ |\ |\ |\ |\ |\ |\
Copper tubing refrigerant lines must be installed for a new
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
system. It is a well known service practice that tubing collapses
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
at bends that must be made, the refrigerant engineer should use
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔level type tubing bender
|\ |\ |\ |\ |\ |\ |\
A reciprocating compressor is making a knocking sound during
|\ |\ |\ |\ |\ |\ |\ |\ |\
operation. If the refrigerant worn parts are not causing the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
knocking, what is the probably the cause? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔the slugging of the liquid refrigerant
|\ |\ |\ |\ |\
