A Carnot engine, whose efficiency is

Question:

A Carnot engine, whose efficiency is $40 \%$ takes in heat from a source maintained at a temperature of $500 \mathrm{~K}$. It is desired to have an engine of efficiency $60 \%$. Then, the intake temperature for the same exhaust (sink) temperature must be :-

 

  1. $600 \mathrm{~K}$

  2. efficiency of Carnot engine cannot be made larger than $50 \%$

  3. $1200 \mathrm{~K}$

  4. $750 \mathrm{~K}$

Correct Option: , 4

Solution:

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