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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

 2 and 4 are correct
 1 and 3 are correct
 1, 2 and 4 are correct
 1, 2 and 3 are correct

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines