Q. 50 A dc series motor driving and electric train faces a constant power load. It is
running at rated speed and rated voltage. If the speed has to be brought down
to 0.25 p.u. the supply voltage has to be approximately brought down to
(A) 0.75 p.u
(B) 0.5 p.u
(C) 0.25 p.u
(D) 0.125 p.u
Answer:(D)
Explanation:
