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)
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
None of these

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

May open or close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center
Opens at 20° before top dead center and closes at 40° after bottom dead center

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