Internal Combustion Engines
In order to eliminate knocking in compression ignition engines, there should be

High self ignition temperature of fuel
Late auto-ignition
Short delay period
Low compression ratio

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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

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

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