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

Equally efficient
More efficient
Other factors will decide it
Less efficient

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Internal Combustion Engines
Flash point of fuel oil is

Temperature at which it catches fire without external aid
Temperature at which it solidifies or congeals
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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