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

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

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Internal Combustion Engines
Scavenging air in diesel engine means

Forced air for cooling cylinder
Burnt air containing products of combustion
Air used for combustion sent under pressure
Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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