51. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
52. Gizzlies are used for separating __________ solids.
53. For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
54. What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
55. Sauter mean diameter is the same as the __________ mean diameter.
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