First slide

Heat engine

Question

A Carnot engine operates with a source at 500 K and sink. at 375 K. The engine consumes 600 kcal of heat in one cycle. The heat rejected to the sink per cycle is

Moderate

A

250 k-cal
B

350 k-cal
C

450 k-cal
D

550 k-cal

Solution

We know that $\frac{Q_{1} â Q_{2}}{Q_{1}} = \frac{T_{1} â T_{2}}{T_{1}}$
$\begin{array}{l} \frac{600 â Q_{1}}{Q_{2}} = \frac{500 â 375}{500} \\ Q_{2} = 450 k â cal . \end{array}$

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