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

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

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Electrical Machines
With the increase in speed of DC motor

 Back emf falls and line current increase.
 Both back emf as well as line current fall.
 Both back emf as well as line current increase.
  Back emf increase but line current falls.

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Electrical Machines
In case of 3 - Φ IM, plugging means

  locking of rotor due to harmonics.
  pulling the motor directly on line without a rotor.
  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.

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