A 240 V dc series motor takes 40 A when giving its rated output at 1,500 rpm.
Its resistance is 0.3Ω
The value of resistance that must be added to obtain rated torque at 1,000 rpm is
A. 6Ω
B. 5.7Ω
C. 2.2Ω
D. 1.9Ω
Show Answer
Answer: D
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