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 brought down to 0.25. the supply voltage has to be approximately brought down to
A. 0.75 pu
B. 0.5 pu
C. 0.25 pu
D. 0.125 pu
Show Answer
Answer: B
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