Chemical Engineering Thermodynamics
When a gas is subjected to adiabatic expansion, it gets cooled due to

Decrease in velocity
Decrease in kinetic energy
Decrease in temperature
Energy spent in doing work

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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?

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

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