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Mechanical Operations

Mechanical Operations
Chance process is used for the

Water treatment
Concentration of pyrites
Concentration of iron ore
Cleaning of coal

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Mechanical Operations
In filtration, the use of 'filter aid' helps in

Deplugging the filter medium
Enhancing the cake porosity in case of a dense impermeable cake
Accelerating the rate of filtration
Reducing the filtration pressure

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Mechanical Operations
Paddle agitator

None of these
Produces axial flow
Is suitable for mixing low viscosity liquids
Moves at very high speed

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Mechanical Operations
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

D2.5
1/D2.5
1/D
D

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Mechanical Operations
For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.

Shell & leaf
Plate & frame
Sand
Rotary vacuum

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Mechanical Operations
For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

5000
5
50
500

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