Consider the given series combination of carnot cycles. If $W_1 = W_2$ then the value of $T$ is ...... $K$ (all temperatures are maintained at their respective values)
Diffcult
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$\mathrm{Q}_{1}-\mathrm{Q}_{2}=\frac{\mathrm{Q}_{2}}{2}-\mathrm{Q}_{3}$
$\frac{Q_{1}}{Q_{2}}-1=\frac{1}{2}-\frac{Q_{3}}{Q_{2}}=\eta-1=\frac{1}{2}-\frac{\eta^{\prime}}{2}$
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