Discussion
Three of the following would improve a screen's effectiveness. Which would worsen it?
Raising the feed rate well above design
Fitting ball trays beneath the deck
Reducing the bed depth
Choosing an aperture shape matched to the separation
Answer: A
Correct answer: Raising the feed rate well above design
Overfeeding deepens the bed on the deck, so undersize particles buried in it never reach the surface of the screen and leave with the oversize. Both recovery and effectiveness fall. The other three all help: ball trays keep the apertures clear, a shallower bed gives every particle a chance at the deck, and the right aperture shape separates on the right dimension.
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