41. To get a fine talc powder from its granules, the equipment used is
42. Removal of activated carbon from glycerine is done by
43. Pick out the wrong statement:
44. For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
45. Stamp mills are generally used for crushing
46. For the preliminary breaking of hard rock, we use a
47. Separation of materials into products based on the difference of their sizes is called
48. For spheres, the specific surface shape factor is given by
49. For a non-spherical particle, the sphericity
50. Ultrafine grinders operate principally by
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