Electrical Machines
Which of the following statements is/are correct statements?

 EMF per turn in HV winding is more than EMF per turn in LV winding
 EMF per turn in HV winding is less than EMF per turn in LV winding
 EMF per turn in both the windings are equal
All of these

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 changes to 1.5 times the original value
 changes to three times the original value
 remain the same as the original
 changes to 0.5 times the original value

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Electrical Machines
The compensating winding in a DC machine

  is located on pole shoes for avoiding the flashover at the commutator.
 is located in armature slots for compensation of the armature reaction.
  is located on pole shoes to avoid the sparking at the brushes.
 is located on commutating poles for improving commutation.

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