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

Mechanical efficiency
Volumetric efficiency
Indicated thermal efficiency
Overall efficiency

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at 40° before top dead center and ends at 40° after top dead center
May start and end anywhere
Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center

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