Question:
Compression ratio of diesel cycle is:
Compression ratio of diesel cycle is:
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Diesel engines need a higher compression ratio to ignite fuel without a spark plug, unlike petrol engines.
Updated On: Jun 21, 2025
- Lower than Otto
- Equal to Otto
- Higher than Otto
- Depends on fuel
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The Correct Option is C
Solution and Explanation
The diesel cycle operates with a compression ignition system, which requires a higher compression ratio to raise the temperature of the air sufficiently to ignite the diesel fuel.
In contrast, the Otto cycle (used in petrol engines) relies on spark ignition, and hence operates with a relatively lower compression ratio to avoid knocking.
Typical compression ratios:
Otto cycle: 8:1 to 12:1
Diesel cycle: 14:1 to 22:1
In contrast, the Otto cycle (used in petrol engines) relies on spark ignition, and hence operates with a relatively lower compression ratio to avoid knocking.
Typical compression ratios:
Otto cycle: 8:1 to 12:1
Diesel cycle: 14:1 to 22:1
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