CFESA-NJ Blue Seal -Refrigeration
Test-Questions with Guaranteed Pass
Solutions 2026 Updated.
On a single acting reciprocating compressor, what is the function of a dual control device? -
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? - Answer The evaporator
What is the main advantage of a cascade refrigeration system? - Answer Capable of reaching
very low temperature
Choose the statement below, which would prove false about lithium bromide used in
absorption system. - Answer It is non-corrosive
What is a sling psychrometer device used to measure? - Answer Relative humidity
A system using an evaporative condenser operates most efficiently under what conditions? -
Answer When the wet-bulb temperature of air is low
The discharge gas from the compressor is what, in a wet-compression refrigeration system? -
Answer Saturated
If a refrigeration system were over charged with refrigerant, what conditions would occur? -
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? - Answer
1,433 tons
What condition would cause a system to not respond to an expansion valve adjustment? -
Answer Oil in the evaporator
In an absorption system, the generator receives what medium? - Answer Strong liquor
Which would have the lease effect on the capacity of a water-cooled condenser? - Answer The
ambient air temperature
,What is the volume occupied by a refrigerant under specified conditions of pressure and
temperature? - Answer Specific volume
What should a cooling tower water pH be maintained at? - Answer 8
The absolute Celsius scale is referred to by which temperature scale? - Answer Kelvin
Which devices control the high side float? - Answer Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius? - Answer 5 degrees F
If you had a flooded evaporator, which type of metering device would you use? - Answer Low
side float
Choose the formula used to determine the number of cycles of concentration for a cooling
tower? - Answer Cycles = Tower water chlorides / Makeup water chlorides
What determines the low side pressure in a refrigeration system? - Answer The amount if load
on the system
Which seal is not used on a refrigeration system? - Answer Mechanical
Which water chemistry test is used to determine cooling tower cycles of concentration? -
Answer Chlorides
Why is a rheostat used on a synchronous motor? - 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? - Answer Crystallization in the system
What is the function of a heat exchanger in an absorption system? - Answer Allows the weak
liquor to heat the strong liquor
Define the term "refrigerant reclaiming" - 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"? - Answer Air at atmospheric conditions
How is the setting on a thermostatic expansion valve rated? - Answer Degrees of superheat
Which statement describes the operation of a single acting compressor? - Answer The
refrigeration gas is compressed on only one side of the piston
Which of the following would cause a noisy compressor? - Answer 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? -
Answer Flow remains constant with a corresponding pressure increase
Thermostatic expansion valves are rated in what units of measurement? - Answer Tons of
refrigeration
If a cooling tower has a pH of 7.8 it is considered - Answer Slightly alkaline
Where would you find flash gas in an efficiently operating system? - Answer The evaporator
The capacity of an evaporative condenser is determined by - Answer The amount of heat the
entering air can absorb ; The amount of air flowing over the coil ; The area of the refrigerant coil
surface ; All of the above
The ratio between the actual pressures of the vapor to its saturation pressure in the
atmosphere is known as - Answer Relative Humidity
A cooling tower is circulating 2,850 GPM of water: What is the cooling capacity in tons? -
Answer 950 tons
What conditions can cause high discharge pressure in a system? - Answer Refrigerant
overcharge ; An undersized condenser ; Insufficient cooling water to the condenser ; All of the
above
What would frost on the suction line of a system using a high side float indicate? - Answer
Overcharged system
In an absorption system, what would cause the strength of the strong liquor to decrease? -
Answer Decrease in the load on the evaporator
Test-Questions with Guaranteed Pass
Solutions 2026 Updated.
On a single acting reciprocating compressor, what is the function of a dual control device? -
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? - Answer The evaporator
What is the main advantage of a cascade refrigeration system? - Answer Capable of reaching
very low temperature
Choose the statement below, which would prove false about lithium bromide used in
absorption system. - Answer It is non-corrosive
What is a sling psychrometer device used to measure? - Answer Relative humidity
A system using an evaporative condenser operates most efficiently under what conditions? -
Answer When the wet-bulb temperature of air is low
The discharge gas from the compressor is what, in a wet-compression refrigeration system? -
Answer Saturated
If a refrigeration system were over charged with refrigerant, what conditions would occur? -
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? - Answer
1,433 tons
What condition would cause a system to not respond to an expansion valve adjustment? -
Answer Oil in the evaporator
In an absorption system, the generator receives what medium? - Answer Strong liquor
Which would have the lease effect on the capacity of a water-cooled condenser? - Answer The
ambient air temperature
,What is the volume occupied by a refrigerant under specified conditions of pressure and
temperature? - Answer Specific volume
What should a cooling tower water pH be maintained at? - Answer 8
The absolute Celsius scale is referred to by which temperature scale? - Answer Kelvin
Which devices control the high side float? - Answer Condenser and receiver
In Fahrenheit, what is the equivalent of -15 degrees Celsius? - Answer 5 degrees F
If you had a flooded evaporator, which type of metering device would you use? - Answer Low
side float
Choose the formula used to determine the number of cycles of concentration for a cooling
tower? - Answer Cycles = Tower water chlorides / Makeup water chlorides
What determines the low side pressure in a refrigeration system? - Answer The amount if load
on the system
Which seal is not used on a refrigeration system? - Answer Mechanical
Which water chemistry test is used to determine cooling tower cycles of concentration? -
Answer Chlorides
Why is a rheostat used on a synchronous motor? - 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? - Answer Crystallization in the system
What is the function of a heat exchanger in an absorption system? - Answer Allows the weak
liquor to heat the strong liquor
Define the term "refrigerant reclaiming" - 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"? - Answer Air at atmospheric conditions
How is the setting on a thermostatic expansion valve rated? - Answer Degrees of superheat
Which statement describes the operation of a single acting compressor? - Answer The
refrigeration gas is compressed on only one side of the piston
Which of the following would cause a noisy compressor? - Answer 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? -
Answer Flow remains constant with a corresponding pressure increase
Thermostatic expansion valves are rated in what units of measurement? - Answer Tons of
refrigeration
If a cooling tower has a pH of 7.8 it is considered - Answer Slightly alkaline
Where would you find flash gas in an efficiently operating system? - Answer The evaporator
The capacity of an evaporative condenser is determined by - Answer The amount of heat the
entering air can absorb ; The amount of air flowing over the coil ; The area of the refrigerant coil
surface ; All of the above
The ratio between the actual pressures of the vapor to its saturation pressure in the
atmosphere is known as - Answer Relative Humidity
A cooling tower is circulating 2,850 GPM of water: What is the cooling capacity in tons? -
Answer 950 tons
What conditions can cause high discharge pressure in a system? - Answer Refrigerant
overcharge ; An undersized condenser ; Insufficient cooling water to the condenser ; All of the
above
What would frost on the suction line of a system using a high side float indicate? - Answer
Overcharged system
In an absorption system, what would cause the strength of the strong liquor to decrease? -
Answer Decrease in the load on the evaporator
