A dc series motor should not be started on no load because it would___________?
Correct answer: C. run at dangerously high speed
- A. not develop starting torque
- B. fail to start without load
- C. run at dangerously high speed
- D. draw more current without producing sufficient torque
Explanation
For a DC series motor, flux decreases sharply when the load is removed, while torque is not needed to sustain rotation. Since speed is approximately inversely proportional to flux, the motor can accelerate to a dangerously high speed.
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