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All of the following control dust at a transfer point EXCEPT

  • A.local exhaust ventilation at the discharge
  • B.enclosing the transfer chute
  • C.reducing the free fall height
  • D.sweeping the spillage with a dry brush

Answer: D

Dry sweeping puts settled dust back into the air, which is why vacuum or wet methods are required instead. The other three all stop the dust being generated or capture it at source. Housekeeping method is as much a control as the plant design.

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