Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° before top dead center and ends at 30° after top dead center
Starts at top dead center and ends at 30° after top dead center
May start and end anywhere
Starts at 15° after top dead center and ends at 30° before bottom dead center

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

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

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