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Mechanical Operations

Mechanical Operations
Pick out the material having minimum Rittinger's number.

Quartz
Calcite
Galena
Pyrite

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Mechanical Operations
In a roll crusher, both the rolls

Are rotated towards each other
Run either at the same or different speeds
Have the same diameter
All of these

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

0.5
1
4.34
1.34

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Mechanical Operations
Filter medium resistance is that offered by the

Filter cloth
Embedded particles in the septum
None of these
Filter cloth and the embedded particle collectively

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Mechanical Operations
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

Centrifugation
Sedimentation
Flocculation
Dispersion

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Mechanical Operations
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

Clarifier
Classifier
Strainer
Thickener

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