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Mechanical Operations

Mechanical Operations
Mixing of light fine powder such as insecticides is done by

Impact wheels
Kneader
Pug mill
Banbery mixer

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Mechanical Operations
Wet grinding in a revolving mill __________ as compared to dry grinding.

Complicates handling of the product
Gives less wear on chamber walls
Requires more energy
Increases capacity

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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 ∝ Re1.0
Po ∝ Re0.0
Po ∝ Re-1.0

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Mechanical Operations
During filtration operation, the filtrate encounters the resistance of the

All of these
Filter medium
Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium
Cake

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Mechanical Operations
The mechanism of size reduction by a hammer mill is by impact and attrition between the

Both A & B
Neither A nor B
Grinding element & the housing
Feed particles

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Mechanical Operations
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a

Sharpies supercentrifuge
Sparkler filter
Batch basket centrifuge
Disc bowl centrifuge

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