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Mechanical Operations

Mechanical Operations
The crushed material received for separation is called feed or

Concentrate
Tailing
Heading
Middling

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Mechanical Operations
Length/diameter ratio of a ball mill is

1
> 1
1.5
< 1

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Mechanical Operations
The operating speed of a ball mill should be __________ the critical speed.

At least equal to
Slightly more than
Less than
Much more than

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Mechanical Operations
__________ baffles are provided in ball mills.

Only two
None of these
No
Horizontal

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

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

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Mechanical Operations
Size reduction of asbestos and mica is done by

Hammer mills
Rod mills
Crushing rolls
Gyratory crushers

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