Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Paraffin, aromatic, napthene
Napthene, paraffin, aromatic
Paraffin, napthene, aromatic
Napthene, aromatics, paraffin

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

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