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The starting current of a directly connected induction motor is typically

  • A.exactly equal to its full-load current at every instant of the start
  • B.zero until the machine has begun to rotate
  • C.several times its full-load current
  • D.smaller than its full-load current because the machine is at standstill

Answer: C

With the rotor stationary the slip is unity and the machine behaves nearly as a short-circuited transformer, drawing five to seven times rated current. Star-delta starting, soft starters and converters all exist to reduce it.

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