Internal Combustion Engines
Which of the following is false statement?

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

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

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

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