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Mechanical Operations

Mechanical Operations
For coarse reduction of hard solids, use

Attrition
Impact
Cutting
Compression

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Mechanical Operations
For classification of potable (drinking) water, we use a __________ filter.

Rotary vacuum
Gravity sand
Vacuum leaf
Plate and frame

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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
Trommels are revolving screens which normally operate in the range of __________ rpm.

40 - 50
60 - 75
15 - 20
43832

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Mechanical Operations
Helical screw agitator is used for

Mixing liquids at very high temperature (> 250 °C)
Blending immiscible liquids
None of these
Mixing highly viscous pastes

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Mechanical Operations
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

Trough washer
Baum jig washer
Spiral separator
Froth floatation

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