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Mechanical Operations

Mechanical Operations
The process opposite to 'dispersion' is termed as the

Filtration
Flocculation
None of these
Sedimentation

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Mechanical Operations
Ultra centrifuges are used for the separation of __________ solid particles.

Dissolved
Fine
Coarse
Colloidal

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Mechanical Operations
Use of 'grinding aids' is done in __________ grinding.

Wet
Intermediate
Dry
Ultrafine

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Mechanical Operations
Which of the following screens has the maximum capacity?

Shaking screen
Grizzlies
Trommels
Vibrating screen

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Mechanical Operations
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is

0.4
0.6
None of these
0.1

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Mechanical Operations
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

√d
D²
1/d
D

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