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Mechanical Operations

Mechanical Operations
Coal is finally pulverised to 200 mesh size for burning in boilers by a

Roll crusher
Ball mill
Hammer crusher
Gyratory crusher

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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

1.34 Wi
Wi
0.5 Wi
3.34 Wi

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Mechanical Operations
increasing the capacity of a screen __________ the screen effectiveness.

Increases
Decreases
Does not effect
None of these

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Mechanical Operations
Gravity stamp mill is meant for the __________ crushing.

Intermediate
Primary
Fine
Ultrafine

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Mechanical Operations
__________ is a cohesive solid.

Wet clay
Wheat
None of these
Sand

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Mechanical Operations
For coarse reduction of hard solids, use

Compression
Cutting
Attrition
Impact

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