Internal Combustion Engines
The delay period in compression ignition engines depends upon

Nature of the fuel mixture strength
Temperature and pressure in the cylinder at the time of injection
Relative velocity between the fuel injection and air turbulence pressure of residual gases
All of these

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Internal Combustion Engines
For the same compression ratio

Diesel cycle is more efficient than Otto
Both Otto and Diesel cycles are, equally efficient
Otto cycle is more efficient than the Diesel
Compression ratio has nothing to do with efficiency

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