First slide

Heat Engine; Carnot Engine and refrigerator

Question

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

Moderate

A

It is impossible
B

It is possible but less probable
C

It is quite probable
D

Data are incomplete.

Solution

$η_{\max} = 1 - \frac{T_{2}}{T_{1}} = 1 - \frac{300}{400}$
$\frac{1}{4} = 25 %$
$\Rightarrow$ So 26% efficiency is impossible

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