Internal Combustion Engines
A hydraulic ram is a device used to

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

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Internal Combustion Engines
Scavenging air in diesel engine means

Forced air for cooling cylinder
Burnt air containing products of combustion
Air used for combustion sent under pressure
Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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