Internal Combustion Engines
The object of providing masked inlet valve in the air passage of compression ignition engines is to

Induce secondary turbulence
Enhance flow rate
Induce primary swirl
Control air flow

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Burnt air containing products of combustion
Forced air for cooling cylinder
Air used for combustion sent under pressure

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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 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

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