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The maximum e...

Question

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

A

55 %

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B

75 %

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C

95 %

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D

none of these

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Solution

The correct option is B none of these
Carnot cycle provides the maximum efficiency for any given temperature. Thus the maximum efficiency is given as $1 - \frac{T_{2}}{T_{1}} = 1 - \frac{60 + 273}{400 + 273} = 1 - \frac{333}{673} = 1 - 0.494 = 0.505 = 50.5 %$

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