Mechanical Operations
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

0.1
0.6
0.4
None of these

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Mechanical Operations
During agitation of liquids, the

All of these
Froude number is independent for the curves between power number and Reynolds number in baffled system
Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number
Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller

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