Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.72.
 0.62.
 0.25.

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

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