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The main reason variable-speed drives have spread so widely is

  • A.the growing use of fluid couplings in industry
  • B.the introduction of higher supply frequencies
  • C.the falling cost of power electronics
  • D.the increasing efficiency of induction machines

Answer: C

Converters that once cost more than the machine now cost a fraction of an installation, which has made variable speed the default rather than the exception. The machines themselves have improved only incrementally over the same period.

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