Discussion
In a diesel engine the compression ratio in comparison to expansion ratio is:
Answer: B
The compression ratio is more than the expansion ratio.
In a diesel cycle, heat is added at constant pressure while the piston moves out, so combustion continues to the cut-off point. With compression ratio \(r = V_{1}/V_{2}\) and cut-off ratio \(\rho = V_{3}/V_{2} \gt 1\), the expansion ratio is
\[ r_{e} = \frac{V_{4}}{V_{3}} = \frac{r}{\rho} \lt r \]
So expansion starts from a larger volume and the expansion ratio is smaller. They are equal only in the Otto cycle, where heat is added at constant volume. 'Variable' is wrong because the inequality always holds.
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