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.

500
5
5000
50

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Mechanical Operations
In case of grinding in a ball mill

Grinding cost and power requirement increases with increasing fineness of the products
Wet grinding achieves a finer product size than dry grinding
All of these
Its capacity decreases with increasing fineness of the products

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