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Arrange these conveyors in order of increasing product damage per tonne handled:

1. Screw conveyor

2. Belt conveyor

3. Pneumatic conveyor

4. Drag conveyor

Select the correct sequence.

  • A.2, 4, 1, 3
  • B.1, 2, 4, 3
  • C.2, 1, 4, 3
  • D.4, 2, 1, 3

Answer: A

A belt lets the material ride untouched, a drag moves it as a bed, a screw shears it against the trough and pneumatic conveying flings it against bends at high speed. The order is essentially the order of relative motion between grain and machine.

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