Chemical Engineering Thermodynamics
Compressibility factor of a gas is

Not a function of its nature
Unity, if it follows PV = nRT
Not a function of its pressure
Not a function of its temperature

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

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