Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
May start and end anywhere

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

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