Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

 1, 2, 3, 4 and 5
 2, 3, 4
 2, 3, 4, 5
 1, 3, 4, 5

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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

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

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Electrical Machines
An ideal synchronous motor has no starting torque because

  relative velocity between stator and rotor mmf’s is not zero.
 rotor is made up of salient poles.
 rotor winding is highly reactive.
 relative velocity between the stator and rotor mmf’s is zero.

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