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Mechanical Operations

Mechanical Operations
The material is crushed in a gyratory crusher by the action of

Impact
Attrition
Cutting
Compression

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Bronze
Concrete
Stainless steel
Flint or porcelain

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Mechanical Operations
The mechanism of size reduction by a hammer mill is by impact and attrition between the

Neither A nor B
Both A & B
Feed particles
Grinding element & the housing

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Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np ∝ NRe
Np ∝ √NRe
Np ∝ 1/NRe
Np → constant

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Mechanical Operations
The process opposite to 'dispersion' is termed as the

Filtration
Flocculation
None of these
Sedimentation

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Mechanical Operations
Basic slag is not ground in

Compartment mills
Tube mills
Ball mills
Jaw crushers

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