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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The relative coefficient of performance is

Actual COP × theoretical COP
Actual COP/theoretical COP
Theoretical COP/actual COP
None of these

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Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Expansion valve
Evaporator
Condenser
Compressor

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Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

R-12
Ammonia
Sulphur dioxide
Carbon dioxide

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

Carbon dioxide
Ammonia
Sulphur dioxide
R-12

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Results in loss of heat due to poor heat transfer
Can be avoided by proper design
Is immaterial
Increases heat transfer rate

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Refrigeration and Air Conditioning
In a refrigeration system, heat absorbed in comparison to heat rejected is

Same
More
Less
More for small capacity and less for high capacity

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