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Mechanical Operations

Mechanical Operations
For the transportation of ultrafine particles, the equipment used is a........conveyor.

None of these
Pneumatic
Belt
Screw

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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 ∝ 1/NRe
Np → constant
Np ∝ √NRe

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Mechanical Operations
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Cresylic acid
Calcium carbonate
Sodium carbonate
Copper sulphate

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Mechanical Operations
Tube mill compared to ball mill

Uses smaller balls
Produces finer products
Is long in comparison with its diameter
All of these

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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

Flint or porcelain
Concrete
Stainless steel
Bronze

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Mechanical Operations
Moisture can be removed from lubricating oil using

Vacuum leaf filter
Sparkler filter
Tubular centrifuge
Clarifier

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