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Mechanical Operations

Mechanical Operations
Mixing of plastic solids is generally facilitated by

Kneading
None of these
Dispersion
Mastication

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Mechanical Operations
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to

N³
N°
N²
N¹

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Mechanical Operations
A tube mill as compared to a ball mill

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
All of these
Gives finer size reduction but consumes more power
Employs smaller balls

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Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Elastic constant of the material
All of these
State or manner of application of the crushing force
Ultimate strength of the material

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Mechanical Operations
__________ mill is not a revolving mill.

Tube
Cage
Pebble
Compartment

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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.

500
5000
5
50

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