First slide

Heat engine

Question

A Carnot engine operates with source at 127 °C and sink at 27 °C. If the source supplies 40 k J of heat energy, the work done by the engine is :

Easy

A

30 kJ
B

10 kJ
C

4 kJ
D

1 kJ

Solution

$η = 1 - \frac{T_{2}}{T_{1}} = \frac{W}{Q_{1}} \Rightarrow 1 - \frac{300}{400} = \frac{W}{40} \Rightarrow W = 10 kJ$

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