©JOSHCLAY 2024/2025. YEAR PUBLISHED, 2024.
Commercial Refrigeration FINAL TEST
Exam Questions and Answer 100% Pass
How is the cooling effect in a mechanical refrigeration system produced? -
✔✔Evaporation of liquid refrigerant into vapor
What is the primary purpose of a compressor? - ✔✔It circulates and
pressurizes the refrigerant vapor before the vapor Is condensed for re use
Name another function that must be performed by the compressor -
✔✔Is raise the pressure and temperature of the refrigerant vapor. This
allows the refrigerant to condense into a liquid as it circulates through the
condenser
What characteristic defines an "open" type compressor? - ✔✔Has a
drive shaft protruding from the compressor
What are the two main disadvantages of a hermetic compressor? - ✔✔If
either the motor or compressor malfunctions, the entire unit must be
replaced. The motor is actually a part of the refrigerant circulation system.
This means that a burnout can contaminate the entire system
, ©JOSHCLAY 2024/2025. YEAR PUBLISHED, 2024.
In a reciprocating compressor, the piston is connected to the crankshaft by
a _____ - ✔✔Connecting rod
Name the three elements of performance that are the major factors in
evaluating a compressor - ✔✔Efficiency, capacity, and economy of
operation
If the suction gas superheat is too low, What could be the result? -
✔✔Liquid refrigerant might enter the compressor. This causes stress on
the compressor valves, wrist pins, rods, shaft, etc. It also causes excessive
foaming of the oil in the crankcase and other damaging effects. The
compressor will not reach its rated capacity
What will happen if the suction gas temperature is too high? - ✔✔Will
cause the compressor to run hot
How is compressor efficiency often judged? - ✔✔Btu per cubic foot
(Btu/ft^3) of displacement
When the same model of open type compressor is used with both air
cooled and water cooled condensing units, which is usually run at a slightly
higher rpm? - ✔✔Water cooled
Commercial Refrigeration FINAL TEST
Exam Questions and Answer 100% Pass
How is the cooling effect in a mechanical refrigeration system produced? -
✔✔Evaporation of liquid refrigerant into vapor
What is the primary purpose of a compressor? - ✔✔It circulates and
pressurizes the refrigerant vapor before the vapor Is condensed for re use
Name another function that must be performed by the compressor -
✔✔Is raise the pressure and temperature of the refrigerant vapor. This
allows the refrigerant to condense into a liquid as it circulates through the
condenser
What characteristic defines an "open" type compressor? - ✔✔Has a
drive shaft protruding from the compressor
What are the two main disadvantages of a hermetic compressor? - ✔✔If
either the motor or compressor malfunctions, the entire unit must be
replaced. The motor is actually a part of the refrigerant circulation system.
This means that a burnout can contaminate the entire system
, ©JOSHCLAY 2024/2025. YEAR PUBLISHED, 2024.
In a reciprocating compressor, the piston is connected to the crankshaft by
a _____ - ✔✔Connecting rod
Name the three elements of performance that are the major factors in
evaluating a compressor - ✔✔Efficiency, capacity, and economy of
operation
If the suction gas superheat is too low, What could be the result? -
✔✔Liquid refrigerant might enter the compressor. This causes stress on
the compressor valves, wrist pins, rods, shaft, etc. It also causes excessive
foaming of the oil in the crankcase and other damaging effects. The
compressor will not reach its rated capacity
What will happen if the suction gas temperature is too high? - ✔✔Will
cause the compressor to run hot
How is compressor efficiency often judged? - ✔✔Btu per cubic foot
(Btu/ft^3) of displacement
When the same model of open type compressor is used with both air
cooled and water cooled condensing units, which is usually run at a slightly
higher rpm? - ✔✔Water cooled
