Discussion
Match each aperture or device in List I with the dimension or property it sorts on in List II.
List I
A. Round perforation
B. Slotted perforation
C. Indent
D. Inclined belt
List II
1. Thickness
2. Width
3. Rolling behaviour
4. Length
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each device measures a different dimension of the particle. A round perforation passes it if its width will go through; a slot if its thickness will. An indent seats it if it is short enough, so indents sort on length. And an inclined belt sorts on rolling behaviour, round particles rolling down while flat and irregular ones are carried up.
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