Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes increase in speed but armature currnet remains the same. decrease in speed but armature current remains the same. increase in speed demanding more armature current. decrease in speed demanding less armature current. increase in speed but armature currnet remains the same. decrease in speed but armature current remains the same. increase in speed demanding more armature current. decrease in speed demanding less armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be None of these 4.8% and -3.2% 3.2% and -1.6% 6% and -4% None of these 4.8% and -3.2% 3.2% and -1.6% 6% and -4% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The no load current in a transformer lags the applied voltage by 0°. 90°. about 75°. about 115°. 0°. 90°. about 75°. about 115°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron reduces the saturation magnetization. increases the electrical resistivity of iron. None of these increases the hysteresis loss. reduces the saturation magnetization. increases the electrical resistivity of iron. None of these increases the hysteresis loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current Cannot be predicted due to insufficient data. Would be equal to If1/2. Woud be equal to 2If1. Would be equal to If1. Cannot be predicted due to insufficient data. Would be equal to If1/2. Woud be equal to 2If1. Would be equal to If1. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is infinite value maximum any of the above zero infinite value maximum any of the above zero ANSWER DOWNLOAD EXAMIANS APP
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