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Question

A heat engine receives 800 W heat at 870 K and reject 500 W to the ambient at 300 K. The ratio of first law efficiency to second law efficiency is

A
0.72
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B
0.42
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C
0.65
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D
0.35
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Solution

The correct option is C 0.65
ηII=ηIηcannot

ηcannot=ηIηII=(1ToT)

=(1300870)=0.65

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