36. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
37. Which of the following screens has the maximum capacity?
38. Solid particles of different densities are separated by
39. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
40. For the transportation of ultrafine particles, the equipment used is a........conveyor.
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