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

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

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

Ratio of pressure after compression and before compression
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

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