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A borehole pump drive requires particular attention to

  • A.the moment of inertia of the pump impeller
  • B.the reactive power drawn from the supply
  • C.the acoustic noise the drive generates
  • D.the long cable between drive and machine

Answer: D

Hundreds of metres of cable reflect the inverter's switching edges and can nearly double the voltage at the machine terminals. An output filter or an inverter-duty winding is essential, and the cable's own charging current has to be allowed for as well.

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