Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve opening before top dead center
Inlet valve closing before bottom dead center
Inlet valve closing after bottom dead center
Exhaust valve closing after top dead center

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

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

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