Electrical Machines
stepped cores are used in transformers in order to reduce

 reluctance of core.
 iron loss.
 volume of iron.
 volume of copper.

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

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate with fall of terminal voltage.
 deteriorate with rise in terminal voltage.
 improve with fall of terminal voltage.
 improve with rise in terminal voltage.

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