26. Grinding efficiency of a ball mill is of the order of __________ percent.
27. In filtration, the use of 'filter aid' helps in
28. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
29. In screen analysis, the notation +5 mm/-10 mm means particles passing through
30. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
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