Internal Combustion Engines
The voltage required to produce a spark across the gap, between the sparking points is

10,000 to 12,000 volts
6000 to 10,000 volts
2000 to 4000 volts
4000 to 6000 volts

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at bottom dead center and closes at top dead center
May open and close anywhere
Opens at 50° before bottom dead center and closes at 15° after top dead center

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