Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
 either of these
None of these
 squirrel cage induction motor

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Electrical Machines
Flashing of DC generator means

 neutralization of residual magnetism.
  increasing flux density by providing extra ampere-turns in field.
None of these
  creation of residual magnetism by a DC source.

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  negative sequence currents are generated.
  the damper bars develop induction motor torque.
  the damper bars develop induction generator torque.
  the damper bars develop synchronous motor torque.

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