Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

 The speed will increase in proportion to reduction in load.
 The speed will increase gradually.
 The speed will remains almost constant.
 The speed will increase abruptly.

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

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Electrical Machines
In large sized DC machines the compensating windings are provided to

  neutralize voltage induced in coil due to fluctuation of l
None of these
 compensate for the decrease in speed due to increase of load.
 reduce eddy current losses by providing local short circuits.

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Electrical Machines
In DC machines, the interpoles are provided

  to make commutation spark less.
  both (B) and (C).
 to counteract demagnetizing effect of armature mmf in commutating zone.
 to counteract the reactance voltage and the cross-magnetizi

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