First slide

Heat engine

Question

A scientist says that the efficiency of his heat engine which work at source temperature 127^oC and sink temperature 27^oC is 26%, then :

Easy

A

it is impossible
B

it is possible but less probable
C

it is quite probable
D

data insufficient

Solution

$η_{\max} = 1 - \frac{T_{2}}{T_{1}} = 1 - \frac{300}{400} = 0.25 = 25 %$
Therefore 26% efficient engine is impossible.

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