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
Jet area is automatically varied depending on the suction
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 inlet valve

Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at top dead center and closes at bottom dead center
May open or close anywhere
Opens at 20° after top dead center and closes at 20° before bottom dead center

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