Discussion
The compression ratio in a diesel engine is of the order of -
Answer: D
The compression ratio of a diesel engine is of the order of 15 to 25.
A diesel engine ignites its fuel by the heat of compression alone, so the air must be compressed enough to raise its temperature above the self-ignition temperature of diesel. That needs compression ratios of roughly 15 to 25.
5 to 8 and 10 to 14 are typical of petrol (SI) engines, which would knock at higher ratios, and 26 to 30 would bring very high pressures and heavy engines for little gain.
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