In a synchronous motor, the armature current has large values for____________?
Correct answer: C. both high and low excitation
- A. high excitation only
- B. low excitation only
- C. both high and low excitation
- D. none of the above
Explanation
For a fixed load, both under-excitation and over-excitation move the motor away from its minimum-current condition, so armature current becomes large at both extremes. The minimum current occurs near the excitation giving unity power factor.
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