Discussion
Which change would NOT improve the effectiveness of a screening operation?
Answer: D
Correct answer: Raising the feed rate well above design capacity
Overfeeding deepens the bed so that undersize particles never reach the deck, and both recovery and effectiveness fall - it is the classic way of trading effectiveness for throughput. The other three all improve the separation: a shallower bed, an aperture shape matched to the dimension being sorted, and devices that keep the apertures open.
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