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An engine operating between the boiling and freezing points of water will have
A. efficiency more than 27%
B. efficiency less than the efficiency of a Carnot engine operating between the same two temperatures.
C. efficiency equal to 27%
D. efficiency less than 27%
Choose the correct answer from the options given below:

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B and D only

A and B only

B, C and D only

B and C only

answer is C.

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Detailed Solution

Carnot’s engine
$η_{\max} = 1 - \frac{T_{2}}{T_{1}} \begin{array}{l} = 1 - \frac{273}{373} = \frac{100}{373} \\ = 0.268 ≃ 0.27 \end{array}$

Efficiency of a real engine is always less than that of a Carnot engine for the same temperatures of source and sink

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