Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 core loss only
 both 1 and 2
 windage and friction loss
 Copper loss

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Electrical Machines
Interpoles in a DC motor must be

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