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A scientist says that the efficiency of his heat engine which operates at source temperature $127^{0} C$ and sink temperature $27^{o} C$ is 26%,then

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detailed solution

Correct option is A

ηmax = 1-T2T1 = 1-300400 = 14= 25%So 26% efficiency is impossible

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A scientist says that the efficiency of his heat engine which operates at source temperature 1270C and sink temperature 27oC is 26%,then

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A scientist says that the efficiency of his heat engine which operates at source temperature $127^{0} C$ and sink temperature $27^{o} C$ is 26%,then