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

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

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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 satisfy the customer regarding the performance of the engine
All of these
To conform the data used in design, the validity of which may be doubtful

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