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A synchronous motor is preferable to an induction motor where the supply is weak because it

  • A.can supply reactive power rather than draw it
  • B.draws a much smaller starting current from the supply
  • C.requires no converter of any kind for variable speed
  • D.develops its rated torque at standstill without difficulty

Answer: A

An induction machine loads a weak supply with magnetising current as well as real power, whereas an over-excited synchronous machine helps to hold the voltage up. Its starting current is the difficulty rather than the advantage.

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