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

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

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Internal Combustion Engines
Flash point of fuel oil is

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Temperature at which it catches fire without external aid

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