Internal Combustion Engines
Which of the following is false statement?

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

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Internal Combustion Engines
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine

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

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

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