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Mechanical Operations

Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

√3
1
0.5
√2

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Mechanical Operations
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to

N°
N³
N²
N¹

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Mechanical Operations
A fluid energy mill is used for

Cutting
Crushing
Grinding
Ultra grinding

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Mechanical Operations
Traces of solids are removed from, liquid in a

Rotary vacuum filter
Classifier
Sparkler filter
Clarifier

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Mechanical Operations
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

3.34 Wi
1.34 Wi
0.5 Wi
Wi

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Mechanical Operations
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a

Hammer mill
Buhrstone mill
Ball mill
Crushing rolls

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