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

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

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at 50° before bottom dead center and closes at 15° after top dead center
May open and close anywhere
Opens at bottom dead center and closes at top dead center

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