The air standard efficiency of an Otto cycle 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. $$1 - \frac{1}{{{{\text{r}}^{\gamma - 1}}}}$$
D. $$1 + \frac{1}{{{{\text{r}}^{\gamma - 1}}}}$$
Answer: Option C

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