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The starting current of an induction machine is typically

  • A.twenty to thirty times its rated current for several seconds
  • B.five to seven times its rated current
  • C.about a fifth of its rated current at the instant of switching on
  • D.exactly equal to its rated current from the first instant

Answer: B

At unity slip only the leakage impedance limits the current, and the resulting surge is what starters and converters exist to reduce. It is also why the supply has to be checked for the voltage dip such a start produces.

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