First slide

Heat engine

Question

The efficiency of a Carnot engine kept at the temperatures of 27⁰C and 127⁰C is

Moderate

A

20%
B

25%
C

30%
D

40%

Solution

Efficiency, $η = 1 - \frac{T_{2}}{T_{1}}$
Given, $T_{2} = 27^{\circ} C = 27 + 273 = 300 K$
$T_{1} = 127^{\circ} C = 127 + 273 = 400 K$
$η = 1 - \frac{3}{4} = 25 %$

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