Internal Combustion Engines
The delay period in compression ignition engines depends upon

Temperature and pressure in the cylinder at the time of injection
Nature of the fuel mixture strength
Relative velocity between the fuel injection and air turbulence pressure of residual gases
All of these

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

May start and end anywhere
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
Starts at top dead center and ends at 40° before bottom 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)2 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 from the centre

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