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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
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

Ribbon
Slat or drag
Screw
Flight

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Mechanical Operations
The process opposite to 'dispersion' is termed as the

Sedimentation
Flocculation
None of these
Filtration

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

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Mechanical Operations
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a

Ball mill
Hammer mill
Crushing rolls
Buhrstone mill

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Mechanical Operations
To get a fine talc powder from its granules, the equipment used is

Gyratory crusher
Jaw crusher
Roller crusher
Ball mill

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