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Mechanical Operations

Mechanical Operations
Limestone is normally crushed in a

Tube mill
Roll crusher
Ball mill
Hammer crusher

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Mechanical Operations
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

0.02 μm/s
0.90 μm/s
1 μm/s
22.1 μm/s

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Mechanical Operations
In paint industries, blending of light paste is done by using a

None of these
Charge can mixer
Kneader
Masticator

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Mechanical Operations
Chance process is used for the

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

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Mechanical Operations
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

3.6 A.S. ρ
3.6 A.V.ρ
3.6 AVS.ρ
3.6 AVS/ρ

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Mechanical Operations
Ultrafine grinders operate principally by

Slow compression
Impact
Attrition
Cutting action

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