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

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

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Electrical Machines
In an alternator, voltage drops occurs in

  armature resistance, leakage reactance, armature reaction and earth connection.
  armature resistance only.
  armature resistance and leakage reactance.
  armature resistance, leakage reactance and armature reaction.

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