Internal Combustion Engines
A hydraulic ram is a device used to

Increase the pressure of water
To lift water from deep wells
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

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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
Nature of the fuel mixture strength
Temperature and pressure in the cylinder at the time of injection
All of these

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