The efficiency of the reversible heat engine is \( \eta_{\mathrm{r}} \) and that of irreversible...

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The efficiency of the reversible heat engine is \( \eta_{\mathrm{r}} \) and that of irreversible heat engine is \( \eta_{\mathrm{i}} \). Which of the following relation is correct?
(a) \( \eta_{\mathrm{r}}=\eta_{1} \)
(b) \( \eta_{\mathrm{r}}\eta_{1} \)
(c) \( \eta_{\mathrm{r}}\eta_{1} \)
(d) \( \eta_{1} \) may be less than, greater than or equal to \( \eta_{\mathrm{r}} \), depending on the gas.
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