Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at 40° after bottom dead center and ends at 10° before top dead center
Starts at 40° before top dead center and ends at 40° after top dead center
May start and end anywhere
Starts at top dead center and ends at 40° before bottom dead center

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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
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

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