16. Rod mills employed for grinding
17. Ultra centrifuges are used for the separation of __________ solid particles.
18. Feed size of ≥ 25 cms can be accepted by
19. The unit of filter medium resistance is
20. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is
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