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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