In figure "2" of the diagram shown in the illustration, the three phase power transformer has a step-down turns ratio of four to one. If a three-phase 440 volt supply is connected to terminals 'A1-B1-C'1, what voltage should develop across terminals 'A2-B2-C2'? Illustration EL-0084

Correct Answer: Option D — 110 volts

A 4:1 step-down ratio divides the applied primary voltage by four. With a 440V three-phase supply connected to the primary, the secondary voltage becomes $440 / 4 = 110$ volts. 46 CFR Subchapter J and IEEE 45 govern transformer ratings to ensure safe low-voltage distribution for shipboard lighting and control circuits.