NJ BLUE SEAL REFRIGERATION Exam 2
Questions And Verified Answers 2025(Graded A+)
Detailed Answers
On a single acting reciprocating compressor, what is the
function of a dual control device?
It allows constant speed control and automatic start and stops
If a system were using an automatic expansion valve, what
would the constant pressure be maintained at?
The evaporator
What is the main advantage of a cascade refrigeration
system?
Capable of reaching very low temperature
Choose the statement below, which would prove false about
lithium bromide used in absorption system.
It is non-corrosive
What is a sling psychrometer device used to measure?
Relative humidity
A system using an evaporative condenser operates most
efficiently under what conditions?
When the wet-bulb temperature of air is low
The discharge gas from the compressor is what, in a wet-
compression refrigeration system?
Saturated
If a refrigeration system were over charged with refrigerant,
what conditions would occur?
Decrease in capacity and increase in head pressure
If a cooling tower circulated 4,300 GPM of water, what is the
cooling capacity in tons?
,1,433 tons
What condition would cause a system to not respond to an
expansion valve adjustment?
Oil in the evaporator
In an absorption system, the generator receives what
medium?
Strong liquor
Which would have the lease effect on the capacity of a water-
cooled condenser?
The ambient air temperature
What is the volume occupied by a refrigerant under specified
conditions of pressure and temperature?
Specific volume
What should a cooling tower water pH be maintained at?
8
The absolute Celsius scale is referred to by which
temperature scale?
Kelvin
Which devices control the high side float?
Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius?
5 degrees F
If you had a flooded evaporator, which type of metering
device would you use?
Low side float
Choose the formula used to determine the number of cycles
of concentration for a cooling tower?
Cycles = Tower water chlorides / Makeup water chlorides
What determines the low side pressure in a refrigeration
system?
The amount if load on the system
, Which seal is not used on a refrigeration system?
Mechanical
Which water chemistry test is used to determine cooling
tower cycles of concentration?
Chlorides
Why is a rheostat used on a synchronous motor?
To vary the power factor to the load conditions
What would happen if you had a sudden drop in the
temperature in the cooling tower of a lithium bromide
absorption system?
Crystallization in the system
What is the function of a heat exchanger in an absorption
system?
Allows the weak liquor to heat the strong liquor
Define the term "refrigerant reclaiming"
Selling reprocessed refrigerant as "reclaimed refrigerant" ;
Reprocessing the refrigerant into a new product that can be
reused ; Chemically analyzing and distilling the refrigerant ; All of
the above
Which phrase best describes the term "free air"?
Air at atmospheric conditions
How is the setting on a thermostatic expansion valve rated?
Degrees of superheat
Which statement describes the operation of a single acting
compressor?
The refrigeration gas is compressed on only one side of the piston
Which of the following would cause a noisy compressor?
Lack of oil ; Dry damaged seal ; Loose drive coupling ; All of the
above
When the evaporator load increases, what happens to the
suction pressure of the system?
Questions And Verified Answers 2025(Graded A+)
Detailed Answers
On a single acting reciprocating compressor, what is the
function of a dual control device?
It allows constant speed control and automatic start and stops
If a system were using an automatic expansion valve, what
would the constant pressure be maintained at?
The evaporator
What is the main advantage of a cascade refrigeration
system?
Capable of reaching very low temperature
Choose the statement below, which would prove false about
lithium bromide used in absorption system.
It is non-corrosive
What is a sling psychrometer device used to measure?
Relative humidity
A system using an evaporative condenser operates most
efficiently under what conditions?
When the wet-bulb temperature of air is low
The discharge gas from the compressor is what, in a wet-
compression refrigeration system?
Saturated
If a refrigeration system were over charged with refrigerant,
what conditions would occur?
Decrease in capacity and increase in head pressure
If a cooling tower circulated 4,300 GPM of water, what is the
cooling capacity in tons?
,1,433 tons
What condition would cause a system to not respond to an
expansion valve adjustment?
Oil in the evaporator
In an absorption system, the generator receives what
medium?
Strong liquor
Which would have the lease effect on the capacity of a water-
cooled condenser?
The ambient air temperature
What is the volume occupied by a refrigerant under specified
conditions of pressure and temperature?
Specific volume
What should a cooling tower water pH be maintained at?
8
The absolute Celsius scale is referred to by which
temperature scale?
Kelvin
Which devices control the high side float?
Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius?
5 degrees F
If you had a flooded evaporator, which type of metering
device would you use?
Low side float
Choose the formula used to determine the number of cycles
of concentration for a cooling tower?
Cycles = Tower water chlorides / Makeup water chlorides
What determines the low side pressure in a refrigeration
system?
The amount if load on the system
, Which seal is not used on a refrigeration system?
Mechanical
Which water chemistry test is used to determine cooling
tower cycles of concentration?
Chlorides
Why is a rheostat used on a synchronous motor?
To vary the power factor to the load conditions
What would happen if you had a sudden drop in the
temperature in the cooling tower of a lithium bromide
absorption system?
Crystallization in the system
What is the function of a heat exchanger in an absorption
system?
Allows the weak liquor to heat the strong liquor
Define the term "refrigerant reclaiming"
Selling reprocessed refrigerant as "reclaimed refrigerant" ;
Reprocessing the refrigerant into a new product that can be
reused ; Chemically analyzing and distilling the refrigerant ; All of
the above
Which phrase best describes the term "free air"?
Air at atmospheric conditions
How is the setting on a thermostatic expansion valve rated?
Degrees of superheat
Which statement describes the operation of a single acting
compressor?
The refrigeration gas is compressed on only one side of the piston
Which of the following would cause a noisy compressor?
Lack of oil ; Dry damaged seal ; Loose drive coupling ; All of the
above
When the evaporator load increases, what happens to the
suction pressure of the system?
