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Mechanical Operations

Mechanical Operations
For separation of sugar solution from settled out mud, we use a __________ filter.

Plate and frame
Sparkler
Centrifugal
Rotary drum vaccum

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Mechanical Operations
Ball mill is used for

Attrition
Crushing
Fine grinding
Coarse grinding

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Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np ∝ 1/NRe
Np → constant
Np ∝ √NRe
Np ∝ NRe

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Mechanical Operations
Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.

Sedimentation
Classification
Flocculation
Clarification

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Mechanical Operations
The critical speed of a trommel (N) is related to its dia (D) as

N ∝ 1/√D
N ∝ D
N ∝ √D
N ∝ 1/D

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Mechanical Operations
According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

0.184
0.00184
1.84
0.0184

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