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Mechanical Operations

Mechanical Operations
Ultrafine grinders operate principally by

Attrition
Cutting action
Slow compression
Impact

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

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Mechanical Operations
Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about

10 to 15°
5 to 10°
1 to 2°
2 to 5°

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Mechanical Operations
Soft & non-abrasive materials can be made into fines by

Attrition
Compression
Cutting
None of these

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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
D2.5
D
1/D2.5

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

Decreasing size of product at constant size of feed
Decreasing machine capacity
Increasing size of feed at constant reduction ratio
None of these

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