Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at top dead center and closes at bottom dead center
May open or close anywhere
Opens at 20° after top dead center and closes at 20° before bottom dead center

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Internal Combustion Engines
Volatility of diesel fuel oil is

Temperature at which it solidifies or congeals
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
Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

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