Internal Combustion Engines
Flash point of fuel oil is

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
Temperature at which it catches fire without external aid
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

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

Flow is produced due to the static head in the float chamber
Jet area is automatically varied depending on the suction
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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