Question

A scientist says that the efficiency of his heat engine which work at source temperature 127∘C and sink temperature 27∘C to 26, then

Answer 1

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$nmax = 1 - \frac{T2}{T1} = 1 - \frac{300}{400} = \frac{1}{4} =25$        

 So 26% efficiency is impossible

Answer 2

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