Internal Combustion Engines
The spark ignition engines are governed by

Qualitative governing
Quantitative governing
Hit and miss governing
Combination of (B) and (C)

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

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

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