In figure "1" of the diagram shown in the illustration, the three phase step down power transformer has a turns ratio of four to one. If a three-phase 440 volt supply is connected to terminals "A1-B1-C1", what voltage should develop across terminals "A2-B2-C2"? EL-0084

Correct Answer: Option B — 110 volts

Three-phase step-down transformer output voltage follows the turns ratio of 4:1. Dividing the 440-volt primary line voltage by 4 yields 110 volts across the secondary line terminals A2-B2-C2 in compliance with 46 CFR Subchapter J electrical design standards.