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Second Law of Thermodynamics

The source an...

Question

The source and sink temperature of a Carnot engine are 400K and 300K respectively. What is the 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 D 25%
It is given that T = 400 K and t = 300 K
These are the temperatures of source and sink respectively.
The efficiency of the cycle is,
$η = 1 - \frac{t}{T}$
$η = 1 - 0.75 = 0.25$
Thus the efficiency is 25 %

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