Discussion
A roller or diverging belt grader for fruit separates on the basis of
Answer: C
Correct answer: Diameter
A roller or diverging belt grader sorts fruit by diameter. The gap between the diverging rollers or belts widens along the machine, so each fruit is carried along until the gap exceeds its diameter and it falls through into the collecting channel for that size class.
The method is simple, gentle and continuous, which suits fruit. Its limitation is that it cannot detect a hollow or under-filled fruit, which has the right diameter but the wrong mass - the reason weight grading is used alongside it for some crops.
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