Internal Combustion Engines
The mean effective pressure obtained from engine indicator indicates the

Average pressure
Maximum pressure developed
Minimum pressure
Instantaneous pressure at any instant

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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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