Internal Combustion Engines
Fuel oil consumption guarantees for I .C. engine are usually based on

Calorific value of fuel
Low heat value of oil
Net calorific value of oil
High heat value of oil

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

May open or close anywhere
Opens at 20° before top dead center and closes at 35° after the bottom dead center
Opens at top dead center and closes at bottom dead center
Opens at 10° after top dead center and closes 20° before the 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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