Question

The efficiency of the reversible heat engine is $\eta_{r}$ and that of irreversible heat engine is $\eta_{l}$. Which of the following relations is correct?

• A. $\eta_{r}>\eta_{l}$
• B. $\eta_{r}<\eta_{l}$
• C. $\eta_{r} \ge \eta_{l}$
• D. $\eta_{r}>1$ and $\eta_{l}<1$

Answer 1

Answer: (A)

The efficiency of reversible engine is always greater than that of irreversible engine. In case of irreversible engine, a part of the energy may be dissipated against friction, etc.