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
Mechanical efficiency
Indicated thermal efficiency
Overall efficiency

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel in a chamber of high pressure at the end of compression stroke
Ensure that penetration is not high
All of these
Inject fuel at a high velocity to facilitate atomization

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