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
The expansion of fuel in a four stroke cycle diesel engine

May start and end anywhere
Starts at top dead center and ends at 30° after top dead center
Starts at 15° after top dead center and ends at 30° before bottom dead center
Starts at 15° before top dead center and ends at 30° after top dead center

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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Directly proportional to its distance from the centre
Inversely proportional to its (distance)2 from the centre
Inversely proportional to its distance from the centre
Directly proportional to its (distance)2 from the centre

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