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

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Chemical Engineering Thermodynamics
An irreversible process

Is the analog of linear frictionless motion in machines
Yields the maximum amount of work
Is an idealised visualisation of behaviour of a system
Yields an amount of work less than that of a reversible process

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