a$)$ The size fractions of a sereen feed, oversize and undersize stream sample are tabulated

below. The oversize represents $62\mathrm{.}5\%$ of the foed mass flowrate.

i$.$ Draw the Tromp curve for the separation

ii$.$ Determine the separating size

iii. Calculate the imperfoction

c$)$ Discuss the criferia for assessment of a centrifuge.