Discussion
Which of the following statement is correct for synchronous motor?
Answer: A
The correct statement is that a synchronous motor can be operated on a leading as well as a lagging power factor. By changing the DC field excitation, an under-excited motor draws lagging current and an over-excited one draws leading current.
The other statements are false: it needs DC excitation for its field, it is not self-starting (it needs an auxiliary means such as damper windings), and its power factor depends on the excitation and, to some extent, the load. So the first option is correct.
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