Internal Combustion Engines
In a four stroke cycle engine, the sequence of operations is

Suction, expansion, compression and exhaust
Compression, expansion, suction and exhaust
Expansion, compression, suction and exhaust
Suction, compression, expansion and exhaust

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

Starts at top dead center and ends at bottom dead center
Starts at 30° after top dead center and ends at 50° after bottom dead center
May start and end anywhere
Starts at 30° before top dead center and ends at 50° before 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

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
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

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