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Mechanical Operations

Mechanical Operations
Feed size of ≥ 25 cms can be accepted by

Jaw crusher
Ball mill
Fluid energy mill
Rod mill

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Mechanical Operations
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

√d
D
1/d
D²

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Mechanical Operations
Mixer used for rubber compounding is

Banbury internal mixer
Pug mill
Mixer-extruder
Muller mixer

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Mechanical Operations
The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

10 times
Same as
2.5 times
5 times

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Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Volatile matter content
Differential wettability
Size
Density separation

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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
Wi
0.5 Wi
1.34 Wi

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