Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging reduces knocking in diesel engines
There can be limited supercharging in petrol engines because of detonation
Supercharging at high altitudes is essential
Supercharging results in fuel economy

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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
Nature of the fuel mixture strength
All of these
Temperature and pressure in the cylinder at the time of injection

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

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

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