Best Fuel for CI Engine is

Answer: a. Straight chain paraffin

The best fuel for the CI engine is straight-chain paraffin.

Solution:

The best fuel for CI engines is straight-chain paraffin, while aromatics are the worst. Aromatics are the best fuel for SI engines, whereas paraffin is the worst. The reason for this is that when utilized in SI engines, regular paraffin has the worst antiknock properties. However, as the number of carbon atoms and the molecular structure becomes more compact, the antiknock quality improves. In SI engines, aromatics provide the best knock resistance.

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