Automobile Engineering in ME
For the same maximum pressure and temperature

Diesel cycle is more efficient than Otto cycle
None of the listed here
Otto cycle is more efficient than Diesel cycle
Both Otto cycle and Diesel cycle are equally efficient

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion
Ignition of the charge before the passage of flame front
Automatic ignition of the charge at the end of compression
Ignition induced by the passage of a spark

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