The air standard efficiency of an I.C. engine is given by (where r = Compression ratio and $$\gamma $$ = Ratio of specific heats)

A. $$1 - {{\text{r}}^{\gamma - 1}}$$

B. $$1 + {{\text{r}}^{\gamma - 1}}$$

C. $$1 - \frac{1}{{{r^{\gamma - 1}}}}$$

D. None of these

Answer: Option C

Solution(By Examveda Team)

The air standard efficiency of an I.C. engine is given by $$1 - \frac{1}{{{r^{\gamma - 1}}}}$$
Where,
r = Compression ratio,
$$\gamma $$ = Ratio of specific heats