The turns ratio of the step down transformer with dual voltage secondary shown in figure "B" of the illustration is two to one (total). If 220 volts were applied to terminals 'H1' and 'H2', what would be measured across 'X3' and 'X4'? EL-0082

Correct Answer: Option C — 55 volts

A transformer with a 2:1 total turns ratio steps 220 volts down to a total secondary voltage of 110 volts. Because the secondary consists of two identical, independent windings, the voltage across a single winding, such as terminals X3 and X4, is exactly half of the total, or 55 volts.