Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using soft material for winding.
 using the magnetic core of low reluctance.
 using transformer oil of better quality.
 increasing the number of turns.

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

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