If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as____________?
Correct answer: C. crawling
- A. humming
- B. hunting
- C. crawling
- D. cogging
Explanation
Running at about one-seventh of normal speed is characteristic of crawling, caused by the interaction of harmonic rotating fields with the rotor. Hunting refers mainly to oscillation of speed or torque around a steady value.
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