Discussion
Assertion (A): Bucket elevators are used for vertical lifts rather than belt conveyors.
Reason (R): A plain belt cannot be inclined much beyond twenty degrees without the material rolling back.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the limitation. Grain on a plain belt begins to roll back at around twenty degrees, so a vertical lift of any height would need an impossible length of belt. A bucket elevator carries the material in enclosed buckets, so the inclination is irrelevant and the lift can be vertical.
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