81. Gold ore concentration is mostly done using
82. Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
83. Which of the following clay mixing devices is vacuum operated for deairation of clay?
84. Pick out the correct statement:
85. Grindability of a material does not depend upon its
86. __________ baffles are provided in ball mills.
87. Crushing efficiency of a machine ranges between __________ percent.
88. 200 mesh seive size corresponds to __________ microns.
89. The specific surface of spherical particles is given by (where D and $$\rho $$ are diameter and density of particle).
90. The most suitable equipment for the transportation of 200 mesh size particles is a
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