Internal Combustion Engines
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called

Overall efficiency
Indicated thermal efficiency
Volumetric efficiency
Mechanical efficiency

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Internal Combustion Engines
Volatility of diesel fuel oil is

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
It catches fire without external aid
Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

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