NJ Blue Seal Refrigeration Test Questions And Answers.
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
, NJ Blue Seal Refrigeration Test Questions And Answers.
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
, NJ Blue Seal Refrigeration Test Questions And Answers.
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
What type of heat exchange occurs at the exterior sides of a cooling tower? - answer;-
Convection
Which of the following statements is true regarding the compression ratio of a
reciprocating compressor? - answer;-Ratio varies according to the conditions under
which it operates
If the high side float were to fill with liquid and sink, what would be the result? - answer;-
The evaporator would starve for refrigerant
In a refrigeration system, what part is considered the low side? - answer;-Between the
compressor and evaporator
What function does the evaporator perform in a refrigeration system? - answer;-None of
the above
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
, NJ Blue Seal Refrigeration Test Questions And Answers.
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
, NJ Blue Seal Refrigeration Test Questions And Answers.
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
What type of heat exchange occurs at the exterior sides of a cooling tower? - answer;-
Convection
Which of the following statements is true regarding the compression ratio of a
reciprocating compressor? - answer;-Ratio varies according to the conditions under
which it operates
If the high side float were to fill with liquid and sink, what would be the result? - answer;-
The evaporator would starve for refrigerant
In a refrigeration system, what part is considered the low side? - answer;-Between the
compressor and evaporator
What function does the evaporator perform in a refrigeration system? - answer;-None of
the above
