A three-phase synchronous motor will have_____________?
Correct answer: C. two slip-rings
- A. no slip-rings
- B. one slip-ring
- C. two slip-rings
- D. three slip-rings
Explanation
The DC field winding of a conventional three-phase synchronous motor is supplied through two slip rings, one for each polarity. Brushless excitation is an alternative construction, but it is not the standard answer here.
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