NJ Blue Seal Refrigeration Test
questions n answers
On a single acting reciprocating compressor, what is the function of a dual control device? -
correct answer ✔✔ 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? - correct answer ✔✔ The evaporator
What is the main advantage of a cascade refrigeration system? - correct answer ✔✔ Capable of
reaching very low temperature
Choose the statement below, which would prove false about lithium bromide used in
absorption system. - correct answer ✔✔ It is non-corrosive
What is a sling psychrometer device used to measure? - correct answer ✔✔ Relative humidity
A system using an evaporative condenser operates most efficiently under what conditions? -
correct answer ✔✔ When the wet-bulb temperature of air is low
The discharge gas from the compressor is what, in a wet-compression refrigeration system? -
correct answer ✔✔ Saturated
If a refrigeration system were over charged with refrigerant, what conditions would occur? -
correct answer ✔✔ 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? - correct
answer ✔✔ 1,433 tons
What condition would cause a system to not respond to an expansion valve adjustment? -
correct answer ✔✔ Oil in the evaporator
In an absorption system, the generator receives what medium? - correct answer ✔✔ Strong
liquor
Which would have the lease effect on the capacity of a water-cooled condenser? - correct
answer ✔✔ The ambient air temperature
What is the volume occupied by a refrigerant under specified conditions of pressure and
temperature? - correct answer ✔✔ Specific volume
What should a cooling tower water pH be maintained at? - correct answer ✔✔ 8
The absolute Celsius scale is referred to by which temperature scale? - correct answer ✔✔
Kelvin
Which devices control the high side float? - correct answer ✔✔ Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius? - correct answer ✔✔ 5 degrees F
If you had a flooded evaporator, which type of metering device would you use? - correct answer
✔✔ Low side float
Choose the formula used to determine the number of cycles of concentration for a cooling
tower? - correct answer ✔✔ Cycles = Tower water chlorides / Makeup water chlorides
, What determines the low side pressure in a refrigeration system? - correct answer ✔✔ The
amount if load on the system
Which seal is not used on a refrigeration system? - correct answer ✔✔ Mechanical
Which water chemistry test is used to determine cooling tower cycles of concentration? -
correct answer ✔✔ Chlorides
Why is a rheostat used on a synchronous motor? - correct answer ✔✔ 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? - correct answer ✔✔ Crystallization in the system
What is the function of a heat exchanger in an absorption system? - correct answer ✔✔ Allows
the weak liquor to heat the strong liquor
Define the term "refrigerant reclaiming" - correct answer ✔✔ 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"? - correct answer ✔✔ Air at atmospheric
conditions
How is the setting on a thermostatic expansion valve rated? - correct answer ✔✔ Degrees of
superheat
questions n answers
On a single acting reciprocating compressor, what is the function of a dual control device? -
correct answer ✔✔ 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? - correct answer ✔✔ The evaporator
What is the main advantage of a cascade refrigeration system? - correct answer ✔✔ Capable of
reaching very low temperature
Choose the statement below, which would prove false about lithium bromide used in
absorption system. - correct answer ✔✔ It is non-corrosive
What is a sling psychrometer device used to measure? - correct answer ✔✔ Relative humidity
A system using an evaporative condenser operates most efficiently under what conditions? -
correct answer ✔✔ When the wet-bulb temperature of air is low
The discharge gas from the compressor is what, in a wet-compression refrigeration system? -
correct answer ✔✔ Saturated
If a refrigeration system were over charged with refrigerant, what conditions would occur? -
correct answer ✔✔ 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? - correct
answer ✔✔ 1,433 tons
What condition would cause a system to not respond to an expansion valve adjustment? -
correct answer ✔✔ Oil in the evaporator
In an absorption system, the generator receives what medium? - correct answer ✔✔ Strong
liquor
Which would have the lease effect on the capacity of a water-cooled condenser? - correct
answer ✔✔ The ambient air temperature
What is the volume occupied by a refrigerant under specified conditions of pressure and
temperature? - correct answer ✔✔ Specific volume
What should a cooling tower water pH be maintained at? - correct answer ✔✔ 8
The absolute Celsius scale is referred to by which temperature scale? - correct answer ✔✔
Kelvin
Which devices control the high side float? - correct answer ✔✔ Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius? - correct answer ✔✔ 5 degrees F
If you had a flooded evaporator, which type of metering device would you use? - correct answer
✔✔ Low side float
Choose the formula used to determine the number of cycles of concentration for a cooling
tower? - correct answer ✔✔ Cycles = Tower water chlorides / Makeup water chlorides
, What determines the low side pressure in a refrigeration system? - correct answer ✔✔ The
amount if load on the system
Which seal is not used on a refrigeration system? - correct answer ✔✔ Mechanical
Which water chemistry test is used to determine cooling tower cycles of concentration? -
correct answer ✔✔ Chlorides
Why is a rheostat used on a synchronous motor? - correct answer ✔✔ 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? - correct answer ✔✔ Crystallization in the system
What is the function of a heat exchanger in an absorption system? - correct answer ✔✔ Allows
the weak liquor to heat the strong liquor
Define the term "refrigerant reclaiming" - correct answer ✔✔ 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"? - correct answer ✔✔ Air at atmospheric
conditions
How is the setting on a thermostatic expansion valve rated? - correct answer ✔✔ Degrees of
superheat
