Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Could be anything
Lower than atmospheric pressure
Equal to atmospheric pressure
Higher than atmospheric pressure

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Refrigeration and Air Conditioning
The coefficient of performance of Electrolux refrigerator is the ratio of

Heat absorbed by the evaporator to the heat supplied by the gas burner
Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
Heat supplied by the gas burner to the heat absorbed by the evaporator
Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

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