Internal Combustion Engines
A hydraulic ram is a device used to

Increase the pressure of water
To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Store the energy of water
To lift water from deep wells

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

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