Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
 low noise.
  a large starting torque.
 reduced starting torque.

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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.
  they have maximum efficiency and maximum starting torque.
  these are cheaper in cost, simple and rugged in construction.

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