Discussion
Consider the following pairs of operating change and its effect on a screen:
Higher feed rate - Deeper bed and lower effectiveness
Larger open area - Higher capacity
Near-size sticky particles - Blinding of apertures
Steeper deck inclination - Longer residence time
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
Three pairs are right. A higher feed rate deepens the bed and lowers effectiveness; a larger open area raises capacity; and near-size sticky particles blind the apertures.
The fourth is wrong and reverses the effect. A steeper deck inclination makes material travel faster, so residence time is shorter, not longer - which raises capacity but reduces the chance for every undersize particle to find an aperture. Inclination is one of the levers by which capacity is traded against effectiveness.
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