Electrical Machines
Dynamic braking is very effective for

 shunt motors.
 separately excited motors.
 series motors.
 differential compound motors.

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  is at standstill with respect to stator mmf.
  rotates at synchronous speed with respect to rotor.
  rotates at slip speed with respect to stator mmf.
  rotates at the speed of rotor in the air gap.

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