Discussion
Arrange the causal chain by which overfeeding a screen degrades performance:
1. Feed rate is raised beyond design capacity
2. The bed on the deck deepens
3. Undersize particles cannot reach the screen surface
4. Effectiveness falls and undersize leaves with the oversize
Select the correct sequence.
Answer: B
Correct answer: 1, 2, 3, 4
The chain runs from operating decision to lost product. Feed rate is raised beyond design capacity (1), so the bed on the deck deepens (2).
In a deep bed the undersize particles lower down cannot reach the screen surface within their travel along the deck (3), so they leave with the oversize and effectiveness falls (4). The loss is of good material into the reject stream, which is why pushing a screen for throughput is usually a false economy.
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