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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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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