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  3. Physics
  4. A number of cannot engines are operated at identical cold reservoir temperatures ( T L ). However, their hot reservoir temperatures are kept different. A graph of the efficiency of the engines versus hot reservoir temperature ( T H ) is plotted. The correct graphical representation is

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Q. A number of cannot engines are operated at identical cold reservoir temperatures $\left( T _{ L }\right)$. However, their hot reservoir temperatures are kept different. A graph of the efficiency of the engines versus hot reservoir temperature $\left( T _{ H }\right)$ is plotted. The correct graphical representation is

KCETKCET 2021Thermodynamics

Solution:

$n =1-\frac{ T _{ L }}{ T _{ H }}$ At constant $T _{ L }$, efficiency increases with the increase in $T _{ H }$.