An ideal gas undergoes cyclic process as shown in density pressure graph. During the process $AB$ the work done $|W_{AB}| = 70\,J$ . During the process $BC$, the gas absorbs $150\,J$ of heat. During the process $CA$ , gas undergoes expansion and does $210\,J$ of work
Diffcult
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| $Q$ | $\Delta U$ | $W$ | |
| $AB$ | $-70$ | $0$ | $-70$ |
| $BC$ | $150$ | $150$ | $0$ |
| $CA$ | $60$ | $-150$ | $210$ |
$\eta=\frac{140}{210} \times 100 \%=60 \%$
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