Question

A Carnot engine is working between $127^{\circ} C$ and $27^{\circ} C$. The increase in efficiency will be maximum when the temperature of

• A. the source is increased by $50^{\circ} C$
• B. the sink is decreased by $50^{\circ} C$
• C. source is increased by $25^{\circ} C$ and that of sink is decreased by $25^{\circ} C$
• D. both source and sink are decreased by $25^{\circ} C$ each.

Answer 1

Answer: (B)

$\frac{T_1-T_2}{T_1}$ is maximum in case (b).