Internal Combustion Engines
The ratio of the brake power to the indicated power is called

Indicated thermal efficiency
Overall efficiency
Mechanical efficiency
Volumetric efficiency

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Internal Combustion Engines
In a typical medium speed, 4-stroke cycle diesel engine

Fuel injection starts at 10° before top dead center and ends at 20° after top dead center
Fuel injection starts at just before top dead center and ends just after top dead center
Fuel injection starts at top dead center and ends at 20° after top dead center
May start and end anywhere

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