66. The value of 'angle of nip' is generally about
67. A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.
68. What is the selectivity index, if the grade of tailings & concentrate is the same?
69. Sphericity of raschig ring (whose length and diameter are equal) is
70. During size reduction by a jaw crusher, the energy consumed decreases with the
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