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
It catches fire without external aid
Temperature at which it solidifies or congeals
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

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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at 30° after top dead center and ends at 50° after bottom dead center
May start and end anywhere
Starts at top dead center and ends at bottom dead center

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