Chemical Engineering Thermodynamics
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

Increased COP
Increased or decreased COP ; depending upon the type of refrigerant
Decreased COP
Same COP

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

It should be non-explosive
None of these
It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
Its vapor pressure at the condenser temperature should be very high

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