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 ? | MCQ Hive

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Q 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 ?

A A. Vapor compression cycle using expansion valve
B B. Air refrigeration cycle
C C. Vapor compression cycle using expansion engine
D D. Carnot refrigeration cycle

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