Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying the supply frequency.
  By varying number of poles.
  By varying supply voltage.
  Both (A) and (B).

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Electrical Machines
DC Motor

  dc compound motor.
  dc shunt motor with field weakening.
  dc series motor.
  dc shunt with armature resistance control.

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