Internal Combustion Engines
A diesel engine as compared to petrol engine (both running and rated load) is

Equally efficient
Less efficient
Other factors will decide it
More efficient

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Internal Combustion Engines
Flash point of fuel oil is

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

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

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

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