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Mechanical Operations

Mechanical Operations
Moisture can be removed from lubricating oil using

Tubular centrifuge
Vacuum leaf filter
Clarifier
Sparkler filter

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Mechanical Operations
The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

Propeller agitator
None of these
Boundary mixer
Sharpies centrifuge

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

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Mechanical Operations
Cement clinker is reduced to fine size by a

Hammer mill
Roll crusher
Ball mill
Tube mill

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Mechanical Operations
Cyclones are used primarily for separating

Liquids
Solids from solids
Solids
Solids from fluids

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Mechanical Operations
The sphericity of a cylinder of 1 mm diameter and length 3 mm is

0.9
0.5
0.6
0.78

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