71. Out of the following size reduction equipments, the maximum feed size can be accepted by the
72. The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively).
73. With increase in the capacity of screens, the screen effectiveness
74. Crushing efficiency is the ratio of the
75. Dust laden air can be purified using a
76. 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
77. Which of the following screens has the maximum capacity?
78. Solid particles of different densities are separated by
79. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
80. For the transportation of ultrafine particles, the equipment used is a........conveyor.
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