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

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

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Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Both (A) and (B)
Prevent sparking across the gap between the points
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
None of these

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