The maximum efficiency of an engine operating between the temperature $400^{o} C$ and $60^{o} C$ is

95%

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75%

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55%

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50.52%

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Solution

The correct option is D 50.52%
Efficiency of the carnot engine $(η) = 1 - \frac{T_{c}}{T_{h}}$
$η = 1 - \frac{333}{673} = 1 - 0.4948 = 0.5052$
i.e. efficiency is 50.52%
Option D.

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