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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Activator
Modifier
Collector
Frother

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Mechanical Operations
Shape factor for a cylinder whose length equals its diameter is

0.5
1.5
1.0
2.0

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Mechanical Operations
Mesh indicates the number of holes per

Linear inch
Square foot
Square inch
Linear foot

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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
Sodium carbonate
Calcium carbonate
Copper sulphate

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Mechanical Operations
For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

5000
5
50
500

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Mechanical Operations
Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the

Stamp mill
Cage mill
Bradford's breaker
Blake jaw crusher

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