Internal Combustion Engines
In a four stroke cycle petrol engine, the charge is ignited at

30° after top dead center
30° before top dead center
30° after bottom dead center
30° before bottom dead center

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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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