Internal Combustion Engines
The ratio of the indicated thermal efficiency to the air standard efficiency is known as

Mechanical efficiency
Volumetric efficiency
Overall efficiency
Relative efficiency

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Internal Combustion Engines
The purpose of testing an internal combustion engine is

To determine the information, which cannot be obtained by calculations
To conform the data used in design, the validity of which may be doubtful
To satisfy the customer regarding the performance of the engine
All of these

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

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

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