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Mechanical Operations

Mechanical Operations
Chance process is used for the

Concentration of iron ore
Water treatment
Cleaning of coal
Concentration of pyrites

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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

0.1
0.4
0.6
None of these

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Mechanical Operations
Apron conveyors are used for

Heavy loads & long runs
Small loads & long runs
Heavy loads & short runs
None of these

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Mechanical Operations
For spheres, the specific surface shape factor is given by

D/V
AD/V
√(AD/V)
A/V

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Mechanical Operations
According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).

√(S/V)p
(S/V)f
(S/V)²p
(S/V)p

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Mechanical Operations
200 mesh screen means 200 openings per

Inch²
Cm
Cm²
Inch

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