Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at bottom dead centre and closes at top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
May open and close anywhere
Opens at 30° before bottom dead centre and closes at 10° after top dead centre

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Internal Combustion Engines
Pour point of fuel oil is the

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

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