For power factor correction, synchronous motors operate at____________?
Correct answer: A. no-load and greatly over-excited fields
- A. no-load and greatly over-excited fields
- B. no-load and under-excited fields
- C. normal load with minimum excitation
- D. normal load with zero excitation
Explanation
For power-factor correction, a synchronous motor is run lightly loaded or at no load with over-excitation, causing it to draw leading current. This leading current compensates lagging current from induction motors and other inductive loads.
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