First slide

Heat engine

Question

The temperature of sink of Camot-engine is $27^{0} C$ . Efficiency of engine is 25%. Then temperature of source is

Easy

A

$150^{0} C$
B

$57^{0} C$
C

$127^{0} C$
D

$87^{0} C$

Solution

$η = 1 - \frac{T_{2}}{T_{1}} \Rightarrow \frac{25}{100} = 1 - \frac{300}{T_{1}} \Rightarrow \frac{3}{4} = \frac{300}{T_{1}}$
$T_{1} = 400 K \Rightarrow t_{1} = 127^{0} C$

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