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

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

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Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
Injecting excess fuel for raising more loads
Supplying compressed air to remove combustion products fully
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

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