Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

 8.248 and 5.54 Ω.
  14.28 and 5.54 Ω.
 14.28 and 9.60 Ω.
 8.248 and 9.60 Ω.

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Electrical Machines
In DC machines, the interpoles are provided

  both (B) and (C).
 to counteract demagnetizing effect of armature mmf in commutating zone.
  to make commutation spark less.
 to counteract the reactance voltage and the cross-magnetizi

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