73.
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

78.
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

79.
If Dp is the equivalent diameter of a non-spherical particle, Vp its volume and Sp its surface area, then its sphericity is Φs is defined by

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