Electrical Machines The slight curvature at the lower end of the OCC of a self excited DC generator is due to high field resistance. magnetic inertia. high speed. residual flux. high field resistance. magnetic inertia. high speed. residual flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A generator may loose residual magnetism due to heating. over excitation. vibrations. any of these. heating. over excitation. vibrations. any of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, the residual magnetism is of the order of 20 %. 2.5 %. 10 %. 15 %. 20 %. 2.5 %. 10 %. 15 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In large sized DC machines the compensating windings are provided to compensate for the decrease in speed due to increase of load. reduce eddy current losses by providing local short circuits. neutralize voltage induced in coil due to fluctuation of l None of these compensate for the decrease in speed due to increase of load. reduce eddy current losses by providing local short circuits. neutralize voltage induced in coil due to fluctuation of l None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machines, the interpoles are provided both (B) and (C). to counteract the reactance voltage and the cross-magnetizi to counteract demagnetizing effect of armature mmf in commutating zone. to make commutation spark less. both (B) and (C). to counteract the reactance voltage and the cross-magnetizi to counteract demagnetizing effect of armature mmf in commutating zone. to make commutation spark less. ANSWER DOWNLOAD EXAMIANS APP
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