Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The friction is unpredictable
The friction is high
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The engine is rarely operated

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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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