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Mechanical Operations

Mechanical Operations
Cyclones are used primarily for separating

Liquids
Solids
Solids from fluids
Solids from solids

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Mechanical Operations
Percentage of drum submerged in the slurry in case of rotary drum filter is

25
85
3
30

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Mechanical Operations
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

2
1.5
√3
√2

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Mechanical Operations
In case of a revolving mill, wet grinding compared to dry grinding

Has less capacity
Requires more energy
Complicates handling & classification of the product
None of these

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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 )

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

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Mechanical Operations
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)

∝ ΔP
Independent of ΔP
∝ √ΔP
∝ 1/ ΔP

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