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Mechanical Operations

Mechanical Operations
Which of the following is not used as filter aid?

Purified wood cellulose
Rice husk
Asbestos
Diatomaceous earth

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Mechanical Operations
The sphericity of a solid particle of cubical shape is

π/3
(π/6)1/3
(π/6)1/2
π

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Mechanical Operations
Length/diameter ratio of a ball mill is

1.5
< 1
1
> 1

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Mechanical Operations
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

Flocculation
Sedimentation
Dispersion
Centrifugation

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Mechanical Operations
A tube mill as compared to a ball mill

Employs smaller balls
All of these
Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
Gives finer size reduction but consumes more power

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Impact
Compression
Cutting
Attrition

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