Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
None of these
 back to back test
 load test

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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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