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 satisfy the customer regarding the performance of the engine
To determine the information, which cannot be obtained by calculations
All of these

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Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

Opens at 20° after top dead center and closes at 20° before bottom dead center
Opens at 20° before top dead center and closes at 40° after bottom dead center
May open or close anywhere
Opens at top dead center and closes at bottom dead center

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