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

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Chemical Engineering Thermodynamics
Absolute zero temperature signifies the

None of these
Temperature of the heat reservoir to which a Carnot engine rejects no heat
Minimum temperature attainable
Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in

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