Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 wooden insulation.
 cotton insulation.
 rubber insulation.
  paper insulation.

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

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