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Mechanical Operations

Mechanical Operations
Which of the following comes in the category of primary crusher for hard and tough stone?

Gyratory crusher
Cone crusher
Jaw crusher
None of these

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Mechanical Operations
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

Df/Dp
Dp/Df
None of these
Df - Dp

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Mechanical Operations
Ore concentration by jigging is based on the difference in the __________ of the particles.

Specific gravities
None of these
Wettability
Shape

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Mechanical Operations
Ultrafine grinders operate principally by

Cutting action
Impact
Attrition
Slow compression

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Mechanical Operations
For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

50
500
5
5000

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Mechanical Operations
The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).

D²p
Dp
1/Dp
1/D²p

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