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

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

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

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

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