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Mechanical Operations

Mechanical Operations
The sphericity of a cylinder of 1 mm diameter and length 3 mm is

0.78
0.5
0.9
0.6

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Mechanical Operations
A tube mill compared to a ball mill

Has a higher length/diameter ratio
Uses much larger balls
Produces a coarser product
Has a higher diameter/length ratio

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Mechanical Operations
Jigging is a technique by which different particles can be

Separated by particle size
Separated by particle shape
Separated by particle density
Mixed

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Mechanical Operations
The main size reduction operation in ultrafine grinders is

Impact
Compression
Cutting
Attrition

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Mechanical Operations
Which of the following is not a revolving/tumbling mill used for size reduction?

Compartment mill
Cage mill
Rod mill
Pebble mill

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Mechanical Operations
For the preliminary breaking of hard rock, we use a

Tube mill
Ball mill
Squirrel-cage disintegrator
Gyratory crusher

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