Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  as wide as possible.
  depends on the material of stator and the rotor.
  as small as possible.

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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

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

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