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

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

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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current fall.
 back emf falls and line current increases.
 both back emf as well as line current increase.
 back emf increases but line current falls.

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