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Thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsThermodynamics1 Mark
Question
Why can an engine working under isothermal conditions produce no useful work?
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Answer

We know that $\eta=1-\frac{\text{T}_2}{\text{T}_1}$ For isothermal operation of the engine, $\text{T}_1=\text{T}_2$ So, $\eta=0$ Hence an engine working under isothermal condition can do no useful work.

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