Internal Combustion Engines
The knock in diesel engine occurs due to

Instantaneous auto ignition of last part of charge
Delayed burning of the first part of the charge
Instantaneous and rapid burning of the first part of the charge
Reduction of delay period

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Internal Combustion Engines
Flash point of fuel oil is

Temperature at which it catches fire without external aid
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Temperature at which it solidifies or congeals
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

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