Electrical Machines A generator may loose residual magnetism due to any of these. vibrations. heating. over excitation. any of these. vibrations. heating. over excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes increase in speed demanding more armature current. decrease in speed but armature current remains the same. decrease in speed demanding less armature current. increase in speed but armature currnet remains the same. increase in speed demanding more armature current. decrease in speed but armature current remains the same. decrease in speed demanding less armature current. increase in speed but armature currnet remains the same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following methods of speed control is not affected through stator side? Change of number of pole. Change of supply frequency. Change of rotor resistance. Change of supply voltage. Change of number of pole. Change of supply frequency. Change of rotor resistance. Change of supply voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3 - Φ induction motor power factor at starting in the same as that while running. power factor at starting is low as compared to that while running. none of them. power factor at starting is high as compared to that while running. power factor at starting in the same as that while running. power factor at starting is low as compared to that while running. none of them. power factor at starting is high as compared to that while running. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will be the eddy current loss if the supply frequency of a transformer becomes double? Doubled. Four times. Eight times. Remains same. Doubled. Four times. Eight times. Remains same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Conservator tank is used for better cooling of transformer. to take up the expansion of oil due to temperature rise. to act as an oil storage. None of these for better cooling of transformer. to take up the expansion of oil due to temperature rise. to act as an oil storage. None of these ANSWER DOWNLOAD EXAMIANS APP
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