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

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

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Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

May open and close anywhere
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre

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