First slide

Heat engine

Question

An ideal heat engine exhausting heat at 27°C is to have 25% efficiency. It must take heat at:

Easy

A

127°c
B

227°c
C

327°C
D

673°C

Solution

$η = 1 - \frac{T_{2}}{T_{1}} \Rightarrow 0.25 = 1 - \frac{300}{T_{1}} \Rightarrow T_{1} = 400 K = 127^{o} C$

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