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

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

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Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
May open and close anywhere
Opens at bottom dead centre and closes at top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre

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Internal Combustion Engines
Pick up the wrong statement about supercharging

There can be limited supercharging in petrol engines because of detonation
Supercharging reduces knocking in diesel engines
Supercharging at high altitudes is essential
Supercharging results in fuel economy

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