The speed of a D.C. series motor is_____________?
Correct answer: D. inversely proportional to the armature current
- A. proportional to the armature current
- B. proportional to the square of the armature current
- C. proportional to field current
- D. inversely proportional to the armature current
Explanation
In the unsaturated region of a series motor, flux is approximately proportional to armature current, while speed varies approximately as 1/φ. Hence speed is approximately inversely proportional to armature current.
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