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

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

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Internal Combustion Engines
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

Increase maximum pressure and decrease maximum temperature
Increase maximum pressure and maximum temperature
Reduce maximum pressure and maximum temperature
Decrease maximum pressure and increase maximum temperature

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