If the lamps pair become dark and bright simultaneously, it indicates incorrect phase sequence

Q.  While synchronization of three phase alternators by lamps bright and dark method, if the lamps pair become dark and bright simultaneously, it indicates
- Published on 29 Oct 15

a. Incorrect phase sequence
b. That the frequencies of alternators are different
c. That voltage of the alternators are not in phase opposition
d. All of these

ANSWER: Incorrect phase sequence

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