Internal Combustion Engines
An hmh flame speed is obtained in diesel engine when air fuel ratio is

Uniform throughout the mixture
Chemically correct mixture
About 35% of rich mixture
About 10% of rich mixture

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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
Swept volume/cylinder volume
Ratio of pressure after compression and before compression

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