In Fig. 5, the effect of variation of tilt angle on ET and
PP and can be seen; efficiency curve shows that the
ET was highest at 3° tilt angle. It decreases initially
with gentle gradient at successive tilt angle until at
6°where the gradient becomes steep to 8°. This
implies that the higher the tilt angle the lower the total
separation efficiency. The PP was highest at 98% at
3° tilt angle and the curve decreases gradually to
93% at 5° and then increases to 96% at 6° and
remains constant till 8° tilt angle. The optimum