A Carnot engine is working between $127^{\circ} \mathrm{C}$ and $27^{\circ} \mathrm{C}$. The increase in…

A Carnot engine is working between $127^{\circ} \mathrm{C}$ and $27^{\circ} \mathrm{C}$. The increase in efficiency will be maximum when the temperature of
  1. the source is increased by $50^{\circ} \mathrm{C}$
  2. the sink is decreased by $50^{\circ} \mathrm{C}$
  3. source is increased by $25^{\circ} \mathrm{C}$ and that of sink is decreased by $25^{\circ}{ }^{\circ} \mathrm{C}$
  4. both source and sink are decreased by $25^{\circ} \mathrm{C}$ each.

Solution

$\frac{\mathrm{T}_{1}-\mathrm{T}_{2}}{\mathrm{~T}_{1}}$ is maximum in case (b). ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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