Internal Combustion Engines
If petrol is used in a diesel engine, then

Low power will be produced
Higher knocking will occur
Efficiency will be low
Black smoke will be produced

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Internal Combustion Engines
A hydraulic ram is a device used to

Increase the pressure of water
To lift water from deep wells
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

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