Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

None of these
Ensures the evaporator completely filled with refrigerant of the load
Maintains different temperatures in evaporator in proportion to load
Is suitable only for constant load systems

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

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

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Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with ozone layer
These react with plants and cause greenhouse effect
These react with oxygen and cause its depletion
These react with water vapour and cause acid rain

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