The thermal efficien

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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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