If the field of a synchronous motor is underexcited, the power factor will be_____________?
Correct answer: C. lagging
- A. zero
- B. unity
- C. lagging
- D. leading
Explanation
An underexcited synchronous motor has insufficient rotor field, so it draws a lagging armature current to supply the required magnetising component. Overexcitation instead produces a leading power factor.
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