Internal Combustion Engines
Compression ratio of I.C. Engines is

Swept volume/cylinder volume
Volume displaced by piston per stroke and clearance volume in cylinder
Ratio of pressure after compression and before compression
The ratio of volumes of air in cylinder before compression stroke and after compression stroke

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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
Store the energy of water
To lift water from deep wells
Increase the pressure of water

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