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

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

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Chemical Engineering Thermodynamics
Which of the following will increase the volume of a real gas by four times ?

Doubling the absolute temperature as well as pressure of the gas
Reducing the temperature to half and doubling the pressure
Reducing pressure to one fourth at constant temperature
Reducing temperature to one fourth at constant pressure

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