Electrical Machines
Interpoles in a DC motor must be

 Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
 Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

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Electrical Machines
Which of the following statements is/are correct statements?

 EMF per turn in both the windings are equal
 EMF per turn in HV winding is less than EMF per turn in LV winding
All of these
 EMF per turn in HV winding is more than EMF per turn in LV winding

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