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Mechanical Operations

Mechanical Operations
200 mesh seive size corresponds to __________ microns.

154
200
74
24

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Attrition
Cutting
Compression
Impact

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Mechanical Operations
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

Decreases
Remains constant
Increases
Increases linearly

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Mechanical Operations
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

25.4 kWh/ton
18 kWh/ton
9.0 kWh/ton
6.35 kWh/ton

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Mechanical Operations
Equivalent diameter of a particle is the diameter of the sphere having the same

Ratio of volume to surface as the particle
Volume as the particle
Ratio of surface to volume as the actual volume
None of these

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Mechanical Operations
__________ mills are termed as disintegrators.

All of these
Pebble
Compartment
Cage

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