Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

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

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

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

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