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Mechanical Operations

Mechanical Operations
The distribution given by microscopic analysis of powder is

Volume
Area
Length
Number

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Mechanical Operations
Gold ore concentration is mostly done using

Froth floatation
Tabling
Jigging
Elutriation

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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

0.6
0.1
0.4
None of these

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Mechanical Operations
Out of the following size reduction equipments, the maximum feed size can be accepted by the

Jet pulveriser
Jaw crusher
Ball mill
Tube mill

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Mechanical Operations
Maximum size reduction in a ball mill is done by the, __________ action.

Attrition
Cutting
Impact
Compression

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Mechanical Operations
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).

S/V
V/D.S
6.V/D.S
V/6D.S

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