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A dc series motor driving an electric train faces a constant power load. lt is running at rated speed and rated voltage. If the speed has to be brouiht down to 0.25. the supply voltage has to he approximately brought down to | |
A. | 0.75 pu [Wrong Answer] |
B. | 0.5 pu [Correct Answer] |
C. | 0.25 pu [Wrong Answer] |
D. | 0.125 pu [Wrong Answer] |