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

The flow from the main jet is diverted to the compensating jet with increase in speed
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
Jet area is automatically varied depending on the suction

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Internal Combustion Engines
Pour point of fuel oil is the

Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
It catches fire without external aid
Temperature at which it solidifies or congeals

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