First slide

Heat engine

Question

An engine has efficiency of $\frac{1}{6}$ . when temperature of sink is reduced by 62^oC, its efficiency is doubled.Temperature of the source is :

Easy

A

99^oC
B

124^oC
C

37^oC
D

62^oC

Solution

$Use η = 1 - \frac{T_{2}}{T_{1}} and get T_{1} = 372 K = 99^{o} C$

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