Electrical Machines
In shapers and slotters which motor are preferred?

  Squirrel cage IM.
  Synchronous motor.
  Slip ring IM.
  Double cage motor.

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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 are capable of operation under range of leading and lagging pf.
  they have very good speed regulation.

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