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

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Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° after bottom dead centre and closes at 10° before top dead centre
May open and close anywhere
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at bottom dead centre and closes at top dead centre

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