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Mechanical Operations

Mechanical Operations
The opening of a 200 mesh screen (Taylor series) is

0.0074 mm
0.0047 cm
0.0074 cm
74 mili-microns

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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 )

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

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Mechanical Operations
For sizing of fine materials, the most suitable equipment is a

Shaking screen
Trommel
Grizzly
Vibrating screen

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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

1 μm/s
0.02 μm/s
22.1 μm/s
0.90 μm/s

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Mechanical Operations
In case of a hammer crusher, the

Minimum product size is 3 mm
Feed may be highly abrasive (Moh's scale >5)
Maximum feed size may be 50 mm
Rotor shaft carrying hammers can be vertical or horizontal

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Mechanical Operations
Tube mill compared to ball mill

Is long in comparison with its diameter
Produces finer products
Uses smaller balls
All of these

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