First slide

Heat engine

Question

An ideal heat engine exhausting heat at 77°C is to have a 30% efficiency. It must take heat at

Easy

A

127°C
B

227°C
C

327°C
D

673°C

Solution

$η = \frac{T_{1} - T_{2}}{T_{1}} η = 0 \cdot 3 and T_{2} = 273 + 77 = 350 K ∴ 0 \cdot 3 = \frac{T_{1} - 350}{T_{1}} or T_{1} = 227^{\circ} C$

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