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

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run in reverse direction.
 The motor will stop.
 The motor will run much faster in the same direction.
 The motor will run at its normal speed in the same direction as before.

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