Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Exhaust valve closing after top dead center
Inlet valve opening before top dead center
Inlet valve closing before bottom dead center
Inlet valve closing after bottom dead center

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

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