Internal Combustion Engines
Compression ratio of I.C. Engines is

Swept volume/cylinder volume
Volume displaced by piston per stroke and clearance volume in cylinder
The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Ratio of pressure after compression and before compression

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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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