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
Starts at top dead center and ends at bottom dead center
May start and end 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)
None of these
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit

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

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