51.
During agitation of liquids, the

52.
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

53.
According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where $${\left( {\frac{{\text{S}}}{{\text{V}}}} \right)_{\text{p}}}$$ and $${\left( {\frac{{\text{S}}}{{\text{V}}}} \right)_{\text{f}}}$$ are surface to volume ratio of the product and feed respectively).

56.
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.

57.
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m. Dr = distance between rolls, ρ = density of material to be crushed, kg/m3. here V = πN.D, where N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

59.
Pick out the wrong statement pertaining to the roll crushers.

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