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Mechanical Operations

Mechanical Operations
__________ are used for the separation of coarse particles from a slurry of fine particles.

Hydrocyclones
Decanters
Thickeners
Classifiers

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Mechanical Operations
Screen capacity is expressed in terms of

Both A & B
Tons/ft²
Tons/hr-ft²
Tons/hr

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Mechanical Operations
In case of a ball mill,

Fine feed requires a larger ball
Coarse feed requires a larger ball
None of these
Operating speed should be more than the critical speed

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Mechanical Operations
Which of the following is the most suitable for handling fibrous and dense slurries?

Propeller agitator
Cone type agitator
Radial propeller agitator
Turbine agitator

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

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Mechanical Operations
Use of 'grinding aids' is done in __________ grinding.

Ultrafine
Wet
Intermediate
Dry

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