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

Volumetric efficiency
Overall efficiency
Indicated thermal efficiency
Mechanical efficiency

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Internal Combustion Engines
Detonation is harmful due to

None of these
High intensity of knock causes crankshaft vibration and the engine runs rough
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

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

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