Internal Combustion Engines
The delay period in compression ignition engines depends upon

Relative velocity between the fuel injection and air turbulence pressure of residual gases
All of these
Temperature and pressure in the cylinder at the time of injection
Nature of the fuel mixture strength

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

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

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