Electrical Machines
In DC generator, the electricity produced in armature is

None of these
  AC.
  armature is not present in DC generator.
  DC.

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Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

 Xd = 8Ω and Xq = 10.8Ω
 Xd = 9Ω and Xq = 9.6Ω
 Xd = 9.6Ω and Xq = 9Ω
 Xd = 10.8Ω and Xq = 8Ω

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Electrical Machines
Compensating windings are used in DC generators

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

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