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Q.

A scientist says that the efficiency of his heat engine which work at source temperature 127oC and sink temperature 27oC 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 insufficient

answer is A.

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Detailed Solution

ηmax=1-T2T1=1-300400=0.25=25%Therefore 26% efficient engine is impossible.
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