Electrical Machines
Compensating windings is placed in which part of a D.C motor?

  On yoke in the pole faces.
 On yoke in the inter pole gap.
None of these
 On armature.

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

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