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

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

Starts at 40° after bottom dead centre and ends at 30° before top dead centre
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
May start and end anywhere
Starts at bottom dead centre and ends at top dead centre

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Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Prevent sparking across the gap between the points
Both (A) and (B)
None of these
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit

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