Internal Combustion Engines
The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

Volumetric efficiency
Relative efficiency
Overall efficiency
Mechanical efficiency

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Internal Combustion Engines
The fuel valve in a four stroke cycle diesel engine

May open and close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 15° before top dead center and closes at 20° after top dead center
Opens at 15° after top dead center and closes at 20° before bottom dead center

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