Discussion
The effectiveness of a screening operation expresses
Answer: D
Correct answer: How completely each fraction is recovered
Screen effectiveness measures how well the separation was actually made: what proportion of the undersize in the feed reported to the underflow, and what proportion of the oversize reported to the overflow. The overall figure is the product of the two.
It is a quality measure and quite distinct from capacity, which is throughput per unit area. The two trade against each other - pushing more material over a deck deepens the bed and lowers effectiveness - so a screen must be specified for both together.
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