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Mechanical Operations

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

Clarification
Sizing
Sorting
Dispersion

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Mechanical Operations
Trommels separate a mixture of particles depending on their

Size
Wettability
Density
Electrical & magnetic properties

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Mechanical Operations
Solid particles of different densities are separated by

Thickness
Cyclones
Sorting classifier
Filters

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Mechanical Operations
Filter medium resistance is important during the __________ of filtration.

None of these
Early stages
Entire process
Final stages

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re1.0
Po ∝ Re0.0
Po ∝ Re-1.0
Po ∝ Re0.5

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Mechanical Operations
Tabular bowl centrifuges as compared to disk bowl centrifuges

Can not be operated under pressure/vacuum
Employ bowl of larger diameter
Operate at higher speed
Can't be used for separation of fine suspended solids from a liquid

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