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Marine Electrical Systems USCG Question #589 (Set 20)

The turns ratio of the tapped step down transformer shown in figure "C" of the illustration is four to one and all taps are evenly spaced. If 120 volts were applied to terminals 'H1' and 'H3', what would appear at 'X1' and 'X2'? EL-0082

USCG Exam Illustration EL-0082
USCG Examination Diagram: Illustration EL-0082
Official USCG Answer & Rule Citation

Correct Answer: Option A — 15 volts

Applying 120 volts across half the primary taps (H1-H3 on a 4:1 tapped winding) alters the effective turns ratio to 2:1 for that section, producing 15 volts across terminals X1 and X2.

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