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
Fuel injector
Fuel pump
Spark plug

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

Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center
May start and end anywhere
Starts at top dead center and ends at bottom dead center

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