Electrical Machines
A compound motor has

  both shunt and series field winding.
  only series field winding.
  tertiary winding.
  only shunt field winding.

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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as

  they have very good speed regulation.
  they are capable of operation under range of leading and lagging pf.
  these are cheaper in cost, simple and rugged in construction.
  they have maximum efficiency and maximum starting torque.

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