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

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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

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

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