Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

May open or close anywhere
Opens at 10° after top dead center and closes 20° before the bottom dead center
Opens at 20° before top dead center and closes at 35° after the bottom dead center
Opens at top dead center and closes at bottom dead center

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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

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

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