76. The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
77. Bond crushing law
78. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
79. The controlling resistance in a rotary drum vacuum filter is the __________ resistance.
80. Which of the following is used for primary crushing of very hard lumpy materials ?
81. Coal is finally pulverised to 200 mesh size for burning in boilers by a
82. Crushing efficiency is the ratio of the
83. The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
84. Cement clinker is reduced to fine size by a
85. The crushed material received for separation is called feed or
86. For spheres, volume shape factor is given by
87. Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise) ?
88. __________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
89. The operating speed of a ball mill should be __________ the critical speed.
90. Use of baffles in agitators help in minimising the __________ tendency.
91. __________ are used for the separation of coarse particles from a slurry of fine particles.
92. Fibrous material is broken by a
93. __________ is the most suitable for compounding rubber and plastic solids.
94. Out of the following size reduction equipments, the maximum feed size can be accepted by the
95. Bucket elevators are not suitable for the vertical lifting of __________ materials.
96. The most common filter aid is
97. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
98. For separation of sugar solution from settled out mud, we use a __________ filter.
99. The sphericity of a cylinder of 1 mm diameter and length 3 mm is
100. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.