The efficiency of a Carnot heat engine is 13. Find the coefficient of performance of Carnot refrigerator when both heat engine and refrigerator are working between similar source and sink.
A
2
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B
3.25
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C
4
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D
7.1
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Solution
The correct option is A2 Here same source and sink have been used for the heat engine and refrigerator both, hence the same Carnot engine is involved for both cases. Efficiency of heat engine is, η=13 The relation between β&η when same Carnot engine is used, ⇒β=1−ηη ∴β=1−1313=2