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Common mode chokes are fitted to a drive output in order to

  • A.limit the dc link inrush current at switch-on
  • B.reduce bearing currents and conducted emission
  • C.increase the fundamental voltage reaching the machine
  • D.provide the reactive power the machine requires

Answer: B

The high-frequency common mode current that switching produces returns through the machine frame and its bearings unless it is choked off. Shaft grounding brushes and insulated bearings address the same problem from the other end.

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