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

May open and close anywhere
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre
Opens at 30° before bottom dead centre and closes at 10° after top dead centre

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

May start and end anywhere
Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at top dead center and ends at 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 determine the information, which cannot be obtained by calculations
To conform the data used in design, the validity of which may be doubtful
All of these

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

Opens at top dead center and closes at bottom dead center
May open and close anywhere
Opens at 15° before top dead center and closes at 20° after top dead center
Opens at 15° after top dead center and closes at 20° before bottom dead center

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