61. In closed circuit grinding as compared to open circuit grinding, the
62. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
63. Specific surface area is the surface area of a unit __________ of materials.
64. Colloidal mills are used for __________ grinding.
65. Cyclones are used primarily for separating
66. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
67. For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as
68. The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)
69. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
70. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
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