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Mechanical Operations

Mechanical Operations
200 mesh seive size corresponds to __________ microns.

200
154
24
74

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Mechanical Operations
Use of grinding aids results in the

Both A & B
Enhanced production rate
Neither A nor B
Finer products

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Mechanical Operations
In classification, particles are said to be equal settling, if they have the same terminal velocities in the

Different fluids
Same fluid
Same field of force
Both B and C

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Mechanical Operations
Bucket elevators are not suitable for the vertical lifting of __________ materials.

Small lumpy (e.g. grains and sand)
Fine (e.g. - 200 mesh size coal)
Free flowing
Sticky (e.g. clay paste)

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Mechanical Operations
Pine oil and cresylic acid are used as __________ in the froth floatation process.

Frother
Collector
Conditioner
Depressor

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Mechanical Operations
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

3.34 Wi
0.5 Wi
1.34 Wi
Wi

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