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Question

The thermal
efficiency of a reversible heat engine operating between two given
thermal reservoirs is 0.4. The device is used either as a refrigerator
or as a heat pump between the same reservoirs. Then the coefficient of
performance as a refrigerator (COP)_R and the co-efficient of performance as a heat pump (COP)_HP are

Options:

A . (COP)R = (COP)HP = 0.6

B . (COP)R = 2.5; (COP)HP = 1.5

C . (COP)R = 1.5; (COP)HP = 2.5

D . (COP)R = (COP)HP = 2.5

Answer: Option C

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