Internal Combustion Engines
The function of a distributor in a coil ignition system of I.C. engines is

To distribute power
To distribute current
To distribute spark
To time the spark

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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
Air used for combustion sent under pressure
Burnt air containing products of combustion
Forced air for cooling cylinder

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