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A motor's power factor against loading

  • A.stays constant at all loadings
  • B.is highest at no load and falls with load
  • C.falls sharply at light load
  • D.rises sharply at light load

Answer: C

The magnetising current is nearly constant while the active component falls with the load, so the ratio of active to total current collapses. A bank of lightly loaded motors is therefore both inefficient and the usual cause of a poor site power factor.

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