Internal Combustion Engines
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

Efficiency ratio
Relative efficiency
Overall efficiency
Net efficiency

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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Directly proportional to its distance from the centre
Inversely proportional to its (distance)2 from the centre
Directly proportional to its (distance)2 from the centre
Inversely proportional to its distance from the centre

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Internal Combustion Engines
Pour point of fuel oil is the

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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