Internal Combustion Engines
Which of the following is false statement?

Oil sludge in the engine crank case
Piston ring and cylinder wear
Detonation
Formation of hard coating on piston skirts

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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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