Internal Combustion Engines
The reason for supercharging in any engine is to

Increase efficiency
Effect fuel economy
Reduce weight and bulk for a given output
Increase power

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

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
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

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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
All of these
To satisfy the customer regarding the performance of the engine

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