Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
 filter the transformer oil.
  absorb moisture of air during breathing.
 absorb moisture from air entering in transformer.

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run at its normal speed in the same direction as before.
 The motor will run in reverse direction.
 The motor will stop.
 The motor will run much faster in the same direction.

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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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