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Mechanical Operations

Mechanical Operations
200 mesh seive size corresponds to __________ microns.

24
74
154
200

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Mechanical Operations
The distribution given by microscopic analysis of powder is

Number
Volume
Area
Length

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Mechanical Operations
For spheres, volume shape factor is given by

AD/V
π/6(=V/D³)
π(=A/D²)
2π(=2A/D²)

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Mechanical Operations
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

None of these
AD/V
π(=A/D²)
π/6(=V/D³)

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

1.5 D
0.5 D
D
2 D

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Mechanical Operations
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

Asbestos & mica
Non-metallic ores
Metalliferrous ores
Basic slags

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