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
50
5000
500

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Mechanical Operations
A filter press is

A batch filter
Having prohibitively high maintenance cost
Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure
Not suitable, if the liquid is the main product

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