Internal Combustion Engines
The ratio of the indicated thermal efficiency to the air standard efficiency is known as

Mechanical efficiency
Volumetric efficiency
Relative efficiency
Overall efficiency

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Internal Combustion Engines
Volatility of diesel fuel oil is

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

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