Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 electromechanical energy conversion.
 generation of voltage.
 commutation.
 development of torque.

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

 supply voltage and field current at constant excitation.
 power factor and supply voltage during hunting.
 supply voltage and excitation current at constant load.
  power factor and DC excitation at constant load.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  rotate in direction opposite to that before maintenance.
  rotate in the same direction as before maintenance.
  not start at all.
  get heated and damaged.

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