A. lagging power factor
B. leading power factor
C. unity power factor
D. lagging to leading power factor
E. any of the above
Answer: B. leading power factor
Explanation:
Synchronous generator:
Asynchronous generator or alternator is capable of operating at all types of power factor i.e. either UPF, leading or lagging power factor.
Leading power factor: If field excitation is such that Eb < V the alternator is said to be under excited and it has a leading power factor.
Lagging power factor: If field excitation is such that Eb > V the alternator is said to be over-excited and it draws lagging current.
Unity power factor: If field excitation is such that Eb = V the alternator is said to be normally excited.
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