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Mechanical Operations

Mechanical Operations
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

Df - Dp
Df/Dp
Dp/Df
None of these

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Mechanical Operations
A fluid energy mill is used for

Grinding
Crushing
Cutting
Ultra grinding

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Mechanical Operations
Screen capacity is expressed in terms of

Tons/hr
Tons/hr-ft²
Tons/ft²
Both A & B

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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
Flint or porcelain
Stainless steel

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Mechanical Operations
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a

Sparkler filter
Sharpies supercentrifuge
Batch basket centrifuge
Disc bowl centrifuge

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

Purified wood cellulose
Asbestos
Rice husk
Diatomaceous earth

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