Electrical Machines
With the increase in speed of DC motor

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

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

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

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