Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Series motor.
  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Shunt 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 interpoles produce additional flux to augment the developed torque
 the flux waveform is improved with reduction in harmonics
 a counter-emf is induced in the coil undergoing commutation
 the inequality of air-gap flux on the top and bottom halves of the armature is removed

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