Commercial Refrigeration FINAL TEST
2025/2026 Exam Questions and Answers
| 100% Solved
How is the cooling effect in a mechanical refrigeration system produced? -
🧠 ANSWER ✔✔Evaporation of liquid refrigerant into vapor
What is the primary purpose of a compressor? - 🧠 ANSWER ✔✔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 - 🧠
ANSWER ✔✔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? - 🧠 ANSWER
✔✔Has a drive shaft protruding from the compressor
What are the two main disadvantages of a hermetic compressor? - 🧠
ANSWER ✔✔If either the motor or compressor malfunctions, the entire unit
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
, must be replaced. The motor is actually a part of the refrigerant circulation
system. This means that a burnout can contaminate the entire system
In a reciprocating compressor, the piston is connected to the crankshaft by
a _____ - 🧠 ANSWER ✔✔Connecting rod
Name the three elements of performance that are the major factors in
evaluating a compressor - 🧠 ANSWER ✔✔Efficiency, capacity, and
economy of operation
If the suction gas superheat is too low, What could be the result? - 🧠
ANSWER ✔✔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? - 🧠 ANSWER
✔✔Will cause the compressor to run hot
How is compressor efficiency often judged? - 🧠 ANSWER ✔✔Btu per cubic
foot (Btu/ft^3) of displacement
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
2025/2026 Exam Questions and Answers
| 100% Solved
How is the cooling effect in a mechanical refrigeration system produced? -
🧠 ANSWER ✔✔Evaporation of liquid refrigerant into vapor
What is the primary purpose of a compressor? - 🧠 ANSWER ✔✔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 - 🧠
ANSWER ✔✔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? - 🧠 ANSWER
✔✔Has a drive shaft protruding from the compressor
What are the two main disadvantages of a hermetic compressor? - 🧠
ANSWER ✔✔If either the motor or compressor malfunctions, the entire unit
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, must be replaced. The motor is actually a part of the refrigerant circulation
system. This means that a burnout can contaminate the entire system
In a reciprocating compressor, the piston is connected to the crankshaft by
a _____ - 🧠 ANSWER ✔✔Connecting rod
Name the three elements of performance that are the major factors in
evaluating a compressor - 🧠 ANSWER ✔✔Efficiency, capacity, and
economy of operation
If the suction gas superheat is too low, What could be the result? - 🧠
ANSWER ✔✔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? - 🧠 ANSWER
✔✔Will cause the compressor to run hot
How is compressor efficiency often judged? - 🧠 ANSWER ✔✔Btu per cubic
foot (Btu/ft^3) of displacement
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
