Internal Combustion Engines
Which of the following is false statement?

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

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

May start and end anywhere
Starts at bottom dead centre and ends at top dead centre
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre

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

May open and close anywhere
Opens at 15° before top dead center and closes at 20° after top dead center
Opens at 15° after top dead center and closes at 20° before bottom dead center
Opens at top dead center and closes at bottom dead center

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