Lamps dark method for synchronization of single phase alternator

Q.  In lamps dark method for synchronization of single phase alternator, if the frequency of two alternators is exactly same as well as their voltages are in exact phase opposition then the resultant voltage will be
- Published on 29 Oct 15

a. Sum of the voltages of two alternators
b. Equal to the voltage of alternators
c. Zero
d. None of these

ANSWER: Zero

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