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Mechanical Operations

Mechanical Operations
Separation of solid particles based on their densities is called

Clarification
Dispersion
Sizing
Sorting

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Mechanical Operations
Chance process is used for the

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

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Mechanical Operations
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

22.1 μm/s
0.90 μm/s
1 μm/s
0.02 μm/s

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Mechanical Operations
The porosity of a compressible cake is

Maximum at the filter medium
Same throughout the thickness of cake
Minimum at the filter medium
Minimum at the upstream face

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Mechanical Operations
Which of the following is a coarse crusher?

Smooth roll crusher
Toothed roll crusher
Tube mill
Gyratory crusher

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Mechanical Operations
Gravity stamp mill is meant for the __________ crushing.

Primary
Fine
Ultrafine
Intermediate

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