Internal Combustion Engines
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

Centre of buoyancy
Centre of gravity
Metacentre
Centre of pressure

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Internal Combustion Engines
Scavenging air in diesel engine means

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

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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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