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, four stroke S.I. engine, two stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.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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Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

Opens at 20° before top dead center and closes at 40° after bottom dead center
May open or close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center

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