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
Mechanical efficiency
Indicated thermal efficiency

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Nature of the fuel mixture strength
All of these
Relative velocity between the fuel injection and air turbulence pressure of residual gases
Temperature and pressure in the cylinder at the time of injection

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