Q.

A scientist says that the efficiency of his heat engine which operates at source temperature 1270C and sink at 270C is 26% then,

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a

It is impossible

b

It is possible but less probable

c

It is quite probable

d

Data are incomplete.

answer is A.

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Detailed Solution

ηmax=1−T2T1=1−30040014=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 at 270C is 26% then,