Discussion
The maximum inclination of a plain belt conveyor handling grain is about
Answer: B
Correct answer: 20 degrees
About 20 degrees is the practical limit for a plain belt handling grain. Beyond it the material rolls back down the belt surface faster than the belt carries it up, so capacity collapses and spillage begins.
The angle of repose of the material is what sets the limit, and grain's is around 25 to 30 degrees. Steeper inclines require a different belt - cleated, ribbed or sidewall - or a different machine altogether, which is why a bucket elevator is used for vertical lifts.
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