Internal Combustion Engines
By higher octane number of spark ignition fuel, it is meant that the fuel has

Lower volatility
Longer ignition delay
Higher heating value
Higher flash point

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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

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

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