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.

5
500
50
5000

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Mechanical Operations
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Fluid energy mill, Jaw crusher, Ball mill
Jaw crusher, Ball mill, Fluid energy mill
Ball mill, Jaw crusher, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher

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