Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.05+j5.08 ohms
 3.5+j5.8 ohms
 8+j13 ohms
 53+j85 ohms

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Electrical Machines
Compensating windings are used in DC generators

  mainly to reduce the eddy currents by providing local short circuit.
  to provide path for the circulation of cooling air.
  to neutralize the cross magnetizing effect of the armature reaction.
None of these

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