Internal Combustion Engines
The object of supercharging the engine is

All of these
To reduce mass of the engine per brake power
To increase the power output of an engine when greater power is required
To reduce space occupied by the engine

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Internal Combustion Engines
A hydraulic ram is a device used to

Store the energy 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
Increase the pressure of water

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