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 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

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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Inversely proportional to its (distance)2 from the centre
Inversely proportional to its distance from the centre
Directly proportional to its distance from the centre
Directly proportional to its (distance)2 from the centre

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