Electrical Machines The material used for commutator brushes is mostly cast iron. mica. carbon. copper. cast iron. mica. carbon. copper. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The condition for maximum running torque is R = S.X unity 0.707 lagging zero 0.5 lagging R = S.X unity 0.707 lagging zero 0.5 lagging ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When pure inductive load is connected to the alternator, what is the effect of armature reaction? Demagnetization Cross magnetization None of these Magnetization Demagnetization Cross magnetization None of these Magnetization ANSWER DOWNLOAD EXAMIANS APP
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 = 9Ω and Xq = 9.6Ω Xd = 9.6Ω and Xq = 9Ω Xd = 8Ω and Xq = 10.8Ω Xd = 10.8Ω and Xq = 8Ω Xd = 9Ω and Xq = 9.6Ω Xd = 9.6Ω and Xq = 9Ω Xd = 8Ω and Xq = 10.8Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as V f f² V² V f f² V² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Poles of DC machine are often laminated to reduce armature reaction. reduce iron weight. dissipate more heat. reduce pulsation loss. reduce armature reaction. reduce iron weight. dissipate more heat. reduce pulsation loss. ANSWER DOWNLOAD EXAMIANS APP
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