Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 non-sinusoidal nature of armature mmf
 magnetic saturation in half of the field pole
 component of armature mmf along field axis

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Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are

 1, 2, 3 and 5
 1, 2 and 3
 1, 3 and 5
 1 and 3

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