Discussion
A screw conveyor moves material by
Answer: C
Correct answer: Rotating a helical flight in a trough
A screw conveyor consists of a helical flight rotating within a fixed trough or tube. The flight pushes the material along as it turns, so the machine is compact, fully enclosed and can discharge at any point along its length through a gate in the trough.
The enclosure suits dusty and hazardous materials. The cost is that the material is dragged against the trough wall, so power per tonne is high and product damage significant - which is why screws are used for short runs rather than long ones.
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