Discussion
A designer proposes a 70 m screw conveyor to save the cost of a belt. This is
Answer: B
Correct answer: Unwise: power and breakage grow with length
A screw drags the material against the trough for the whole of its length, so both power and attrition rise in proportion to the run. Over 70 m the operating cost and product damage would swamp any saving in capital, and a belt would use a fraction of the power with almost no breakage.
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