$5\mathrm{.}1$ A $985$ efficient ESP is to treat a gas stream flowing at $5000\frac{m^3}{?}$ min. If the effective drift velocity is $6\mathrm{.}0c\frac{m}{s},$ calculate $($a$)$ the plate area $($required and actual$)$ in $m^2,$ and $($b$)$ the number of plates if each plate is $6m$ by $10m,$ and there are $3$ sections in the direction of flow.

$5\mathrm{.}2$ Aveume that the E$.$SP of Problem $5\mathrm{.}1$ is built with an actual col. lection area of $5400m^2.$ Now suppose that the actual drif veloc. ity turns out to be $5\mathrm{.}0c\frac{m}{s}$ and the actual gas flow turns out to be $5500\frac{m^3}{m}in.$ Calculate the actual efficiency.