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

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

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

Jet area is automatically varied depending on the suction
Flow is produced due to the static head in the float chamber
The diameter of the jet is constant and the discharge coefficient is invariant
The flow from the main jet is diverted to the compensating jet with increase in speed

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