Electrical Machines
An inverted V curve of synchronous motor shows variation of

 supply voltage and field current at constant excitation.
 power factor and supply voltage during hunting.
  power factor and DC excitation at constant load.
 supply voltage and excitation current at constant load.

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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 and 3
 1, 3 and 5
 1, 2 and 3

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