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Com of Solid Bodies

The source an...

Question

The source and sink temperatures of a Carnot engine are $400 K$ and $300 K$ , respectively. What is its efficiency?

A

100 %

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B

75 %

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C

33.3 %

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D

25 %

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Solution

The correct option is C $25 %$
Efficiency, $η = 1 - \frac{T_{2}}{T_{1}}$
$T_{1}$ {source temp.} = $400 K$
$T_{2}$ {Sink temp.} = $300 K$
$∴ η = 1 - \frac{300}{400} = \frac{1}{4} = 25 %$

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