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The main winding of a single-phase induction motor is

  • A.wound with finer wire than the auxiliary and used only for starting
  • B.connected in series with the starting capacitor at all times
  • C.disconnected by the centrifugal switch as the machine speeds up
  • D.wound with heavier wire and occupies most of the slots

Answer: D

Correct answer: wound with heavier wire and occupies most of the slots

The main winding carries the load current continuously, so it is wound with heavier wire and given the greater part of the slot space. The auxiliary winding is fine-wired and higher in resistance, which both produces the phase displacement wanted and suits a winding that is energised only briefly.

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