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The double revolving field theory explains the single-phase machine by resolving its pulsating field into

  • A.a steady field fixed in both direction and magnitude
  • B.two fields of half amplitude rotating in opposite directions
  • C.a single field of constant amplitude rotating at synchronous speed
  • D.three fields displaced by a hundred and twenty degrees in space

Answer: B

Each component behaves like the field of a three-phase machine, one giving forward torque and one backward, and their torques cancel at standstill. Once the rotor moves, the slips with respect to the two fields differ and a net torque appears.

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