Internal Combustion Engines
In a four stroke cycle petrol engine, the charge is ignited at

30° after top dead center
30° before top dead center
30° before bottom dead center
30° after bottom dead center

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Internal Combustion Engines
Volatility of diesel fuel oil is

It catches fire without external aid
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

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