Electrical Machines Which of the following is/are the advantages of carbon brush over the copper brush? All of these They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes They are self lubricating in nature All of these They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes They are self lubricating in nature ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is 1 and 3 1 alone 1 and 2 2 and 3 1 and 3 1 alone 1 and 2 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In large sized DC machines the compensating windings are provided to reduce eddy current losses by providing local short circuits. compensate for the decrease in speed due to increase of load. None of these neutralize voltage induced in coil due to fluctuation of l reduce eddy current losses by providing local short circuits. compensate for the decrease in speed due to increase of load. None of these neutralize voltage induced in coil due to fluctuation of l ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is 0 Hz 100 Hz 25 Hz 50 Hz 0 Hz 100 Hz 25 Hz 50 Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Induction motors have the advantage of all of below. less cost. simple in construction. less maintenance. all of below. less cost. simple in construction. less maintenance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is minimized by laminating the core of a transformer? Hysteresis loss. Eddy current loss. Stray loss. Copper loss. Hysteresis loss. Eddy current loss. Stray loss. Copper loss. ANSWER DOWNLOAD EXAMIANS APP
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