Q$5$ Set B$.$ Determine the terminal settling velocity for a sand particle with an average diameter of $0\mathrm{.}6mm$ and a shape factor of $0\mathrm{.}85,$ and a specific gravity of $2\mathrm{.}65,$ settling in water at $20C.$ At this temperature, the kinematic viscosity value is $1\mathrm{.}003{10}^{-6}\frac{m^2}{s}(5$marks$)$

Q$6$ Set A$.$ How does the use of settlers improve the sedimentation process? What is scour velocity in the primary sedimentation process? $(5$ marks$)$

Q$6$ Set B$.$ What are various factors that dictate the choice of impeller for a mixing process $(5$ marks$)$