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

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

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Chemical Engineering Thermodynamics
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Carnot refrigeration cycle
Vapor compression cycle using expansion engine
Vapor compression cycle using expansion valve
Air refrigeration cycle

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