Refrigeration and Air Conditioning
The evaporator changes the low pressure liquid refrigerant from the expansion valve into

None of these
High pressure liquid refrigerant
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant

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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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