Z51 REFRIGERATION TEST NEWEST TEST | ALL
QUESTIONS AND CORRECT ANSWERS | GRADED A+ |
VERIFIED ANSWERS | STUDY THIS ONE!
Efficiency of the refrigerant cycle is affected by the operations of the condenser.
Of the following, a more efficient centrifugal compressor operation results from: -
(answers)Lowering the condensing pressure
The heat removed from the refrigerant in a condenser is: - (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: - (answers)Are approved by the US Dept. of Transportation
Which of the following best describes how the cylinder unloader works? -
(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: - (answers)Cool
the motor
The amount of refrigerant that flows through the orifices of an economizer is
determined by the: - (answers)Differences between the high side and low side
pressure
,The installation of an inline refrigerant cleaning system is advisable: - (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: - (answers)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: - (answers)1.69
A superheated vapor is: - (answers)Dry vapor above the saturation temperature
A refrigerant engineer verifies that a condenser water pump is cavitating. Of the
following, the most likely cause for this condition is: - (answers)A faulty cooling
tower water level controller
A centrifugal water pump is known as a lift pump when the: - (answers)The water
supply to the pump suction inlet is below the pump level
A TXV is used to maintain constant: - (answers)Evaporator superheat
The chilled water supply to the building is 55 deg F. If the chiller is being used for
human comfort, should you be concerned about this, and why? - (answers)Yes,
this temp is too high for human comfort purposes
,The packing gland of a centrifugal pump serves to: - (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: - (answers)Operation of the hot gas bypass valve
The most important reason to sub-cool the refrigerant in the condenser is to
ensure that: - (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? - (answers)An expansion valve that is open too wide
A low side float valve is used to maintain: - (answers)The level of the refrigerant in
the evaporator
Regarding fire safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity? - (answers)A1
When an expansion valve is operating properly, at the end of the evaporator will
contain: - (answers)Only superheated vapor
What information is not contained in a Material Safety Data Sheet? -
(answers)Cost of the material
, In a steam turbine, what is the function of the Kingsbury thrust bearing? -
(answers)Maintain axial positioning of the rotor shaft
A centrifugal water pump is considered to the fully primed when? - (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? - (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 probably the cause? -
(answers)Slugging of the liquid refrigerant
In order for a refrigerant to become superheated, it must be heated in a section
of the low side refrigerant line: - (answers)Where no liquid refrigerant is present
All liquid has been recovered from a system to be overhauled, the system: -
(answers)Should not be opened until all vapor has been recovered
When a refrigerant engineer uses a portable compressor recovery unit to remove
vapor refrigerant from a refrigeration system the removal rate of the refrigerant
will gradually slow down because? - (answers)The compressor efficiency is
decreasing
QUESTIONS AND CORRECT ANSWERS | GRADED A+ |
VERIFIED ANSWERS | STUDY THIS ONE!
Efficiency of the refrigerant cycle is affected by the operations of the condenser.
Of the following, a more efficient centrifugal compressor operation results from: -
(answers)Lowering the condensing pressure
The heat removed from the refrigerant in a condenser is: - (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: - (answers)Are approved by the US Dept. of Transportation
Which of the following best describes how the cylinder unloader works? -
(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: - (answers)Cool
the motor
The amount of refrigerant that flows through the orifices of an economizer is
determined by the: - (answers)Differences between the high side and low side
pressure
,The installation of an inline refrigerant cleaning system is advisable: - (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: - (answers)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: - (answers)1.69
A superheated vapor is: - (answers)Dry vapor above the saturation temperature
A refrigerant engineer verifies that a condenser water pump is cavitating. Of the
following, the most likely cause for this condition is: - (answers)A faulty cooling
tower water level controller
A centrifugal water pump is known as a lift pump when the: - (answers)The water
supply to the pump suction inlet is below the pump level
A TXV is used to maintain constant: - (answers)Evaporator superheat
The chilled water supply to the building is 55 deg F. If the chiller is being used for
human comfort, should you be concerned about this, and why? - (answers)Yes,
this temp is too high for human comfort purposes
,The packing gland of a centrifugal pump serves to: - (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: - (answers)Operation of the hot gas bypass valve
The most important reason to sub-cool the refrigerant in the condenser is to
ensure that: - (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? - (answers)An expansion valve that is open too wide
A low side float valve is used to maintain: - (answers)The level of the refrigerant in
the evaporator
Regarding fire safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity? - (answers)A1
When an expansion valve is operating properly, at the end of the evaporator will
contain: - (answers)Only superheated vapor
What information is not contained in a Material Safety Data Sheet? -
(answers)Cost of the material
, In a steam turbine, what is the function of the Kingsbury thrust bearing? -
(answers)Maintain axial positioning of the rotor shaft
A centrifugal water pump is considered to the fully primed when? - (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? - (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 probably the cause? -
(answers)Slugging of the liquid refrigerant
In order for a refrigerant to become superheated, it must be heated in a section
of the low side refrigerant line: - (answers)Where no liquid refrigerant is present
All liquid has been recovered from a system to be overhauled, the system: -
(answers)Should not be opened until all vapor has been recovered
When a refrigerant engineer uses a portable compressor recovery unit to remove
vapor refrigerant from a refrigeration system the removal rate of the refrigerant
will gradually slow down because? - (answers)The compressor efficiency is
decreasing
