Discussion
Consider the following statements about screening:
1. Effectiveness combines the recovery of both output streams.
2. Capacity and effectiveness trade against one another.
3. A deeper bed improves the chance of undersize passing.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: effectiveness combines the recovery of undersize in the fines and of oversize in the coarse stream, and capacity trades against it. Statement 3 is the reverse of the truth - a deeper bed buries the undersize so that it never reaches the deck, which is exactly why effectiveness falls as feed rate rises.
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