Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 run at very low speed.
 start haunting.
 run at very high speed.

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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, 3 and 5
 1, 2 and 3
 1 and 3

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