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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The coefficient of performance is the ratio of the refrigerant effect to the

Work done by compressor
Enthalpy increase in compressor
All of these
Heat of compression

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Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

R-12
All of these
CO?
Ammonia

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Refrigeration and Air Conditioning
Air refrigeration operates on

Rankine’s cycle
Reversed Carnot cycle
Carnot cycle
Brayton cycle

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Refrigeration and Air Conditioning
One of the purposes of sub cooling the liquid refrigerant is to

Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Increase cooling effect
Reduce compressor discharge temperature
Reduce compressor overheating

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Refrigeration and Air Conditioning
Where does the lowest temperature occur in a vapour compression cycle?

Evaporator
Compressor
Condenser
Expansion valve

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

All of these
Increases power required per ton of refrigeration
Lowers compressor capacity because vapour is lighter
Lowers evaporation temperature

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MORE MCQ ON Refrigeration and Air Conditioning

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