Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
 None of above.
 Remains unchanged.
  Increases.

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Electrical Machines
The synchronous motor can be started by

  any of the above methods.
  coupling it with a small AC induction motor called the pony motor.
  providing damper winding in its rotor circuit.
  coupling it with a DC compound motor.

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 the flux waveform is improved with reduction in harmonics
 a counter-emf is induced in the coil undergoing commutation
 the interpoles produce additional flux to augment the developed torque
 the inequality of air-gap flux on the top and bottom halves of the armature is removed

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