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?

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

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Chemical Engineering Thermodynamics
Claussius-Clayperon equation gives accurate result, when the

Volume in the liquid state is negligible compared with that in the vapour state
Vapour pressure is relatively low and the temperature does not vary over wide limits
All of these
Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

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