Electrical Machines Compensating windings are used in DC generators mainly to reduce the eddy currents by providing local short circuit. None of these to neutralize the cross magnetizing effect of the armature reaction. to provide path for the circulation of cooling air. mainly to reduce the eddy currents by providing local short circuit. None of these to neutralize the cross magnetizing effect of the armature reaction. to provide path for the circulation of cooling air. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines No load primary current in a transformer leads the applied voltage somewhat less than 90Ã& lags behind applied voltage somewhat less than 90à lags behind applied voltage by exactly 90Â&am leads the applied voltage by exactly 90Â& leads the applied voltage somewhat less than 90Ã& lags behind applied voltage somewhat less than 90à lags behind applied voltage by exactly 90Â&am leads the applied voltage by exactly 90Â& ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which of the following motors DC excitation is not required? 3-phase synchronous motor hysteresis motor 3-phase synchronous generator reluctance motor 3-phase synchronous motor hysteresis motor 3-phase synchronous generator reluctance motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Copper brushes in DC machine are used where low voltage and high currents are involved. in both of above cases. None of these where high voltage and low current. where low voltage and high currents are involved. in both of above cases. None of these where high voltage and low current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following DC motors will have percentage increase of input current for the same percentage increase in torque? Series. Cummulative compound. Shunt. Differntical compound. Series. Cummulative compound. Shunt. Differntical compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes decrease in speed demanding less armature current. decrease in speed but armature current remains the same. increase in speed demanding more armature current. increase in speed but armature currnet remains the same. decrease in speed demanding less armature current. decrease in speed but armature current remains the same. increase in speed demanding more armature current. increase in speed but armature currnet remains the same. ANSWER DOWNLOAD EXAMIANS APP
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