The Thermal Efficiency of a Reversible Heat Engine Operating Between

question 30

Multiple Choice

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

• 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

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