The efficiency of a Carnot engine operating with reservoir temperature of $100\,^{\circ} C$ and $-23\,^{\circ} C$ will be
AIPMT 1997, Easy
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Reservoir temperature $\left(T_{1}\right)=100^{\circ} C =373$ $K$ and $T_{2}=-23^{\circ} C =250 K$
The efficiency of a Carnot engine
$\eta=\frac{T_{1}-T_{2}}{T_{1}}=\frac{373-250}{373}$
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