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

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

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  none of them.
  power factor at starting is low as compared to that while running.
  power factor at starting in the same as that while running.

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