Discussion
A disc separator performs essentially the same separation as
Answer: D
Correct answer: An indented cylinder
A disc separator makes the same separation as an indented cylinder - on length - but with a different geometry. Discs carrying indents on their faces rotate through the seed bed, lifting the short seeds out while the long ones fall back.
The advantage over the cylinder is capacity: many discs can be mounted on one shaft in the space a single cylinder would occupy, so throughput per unit floor area is higher. The separating principle, and the type of impurity each removes, are identical.
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