Internal Combustion Engines
In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a

None of these
Spark plug
Fuel pump
Fuel injector

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Internal Combustion Engines
The fuel valve in a four stroke cycle diesel engine

Opens at 15° after top dead center and closes at 20° before bottom dead center
Opens at top dead center and closes at bottom dead center
Opens at 15° before top dead center and closes at 20° after top dead center
May open and close anywhere

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