Internal Combustion Engines
Pick up the wrong statement about supercharging

There can be limited supercharging in petrol engines because of detonation
Supercharging at high altitudes is essential
Supercharging results in fuel economy
Supercharging reduces knocking in diesel engines

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Internal Combustion Engines
A hydraulic ram is a device used to

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

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