Discussion
Increasing the feed rate to a screen beyond its capacity generally
Answer: B
Correct answer: Reduces effectiveness, the bed being too deep
Beyond a screen's design capacity the bed on the deck deepens, and undersize particles lower in the bed cannot reach the screen surface during their travel along it. They leave with the oversize, so the recovery of undersize falls.
The trade is between capacity and effectiveness: a screen can always be pushed harder, but the separation degrades. Where both are needed, the answer is more screen area or an additional deck, not a higher feed rate - and the loss shows up as good material rejected, which is expensive.
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