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A single-phase induction motor needs a starting arrangement because

  • A.its rotor resistance is too high for torque to be developed
  • B.its field pulsates rather than rotates at standstill
  • C.its rotor has no windings in which current can be induced
  • D.its supply frequency is too low to produce any torque at all

Answer: B

A pulsating field can be resolved into two counter-rotating fields of equal strength, whose torques cancel at standstill. A capacitor or auxiliary winding makes the field elliptical and gives a net torque to start with.

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