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

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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

All of these
Inject fuel at a high velocity to facilitate atomization
Inject fuel in a chamber of high pressure at the end of compression stroke
Ensure that penetration is not high

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