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Mechanical Operations

Mechanical Operations
Fluid energy mill comes in the category of

Grinder
Cutter
Ultrafine grinder
Crusher

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Mechanical Operations
Sphericity of pulverised coal is

∞
>1
1

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Mechanical Operations
Tabular bowl centrifuges as compared to disk bowl centrifuges

Can't be used for separation of fine suspended solids from a liquid
Can not be operated under pressure/vacuum
Employ bowl of larger diameter
Operate at higher speed

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

Rice husk
Diatomaceous earth
Purified wood cellulose
Asbestos

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Cutting
Attrition
Impact
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

Concrete
Bronze
Stainless steel
Flint or porcelain

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