Question

Write some points on hydraulic washing machine

Answer 1

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Gravity separation is a process of concentration of ore in which gangue(impurity) is separated from desired metal ore on the basis of their specific gravity. Generally water is used as medium therefore sometime called as hydraulic washing.

Answer 2

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1) can be used where power cant be transmitted mechanically like rotation etc

2) to achieve a higher power level from a lower level without using levers or pulleys or gears

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