On a steamship, if #1 SSTG fails to produce a voltage while in the automatic voltage control mode, but successfully produces a voltage while in the manual control mode, what statement is true?

Correct Answer: Option A — The voltage failure would most likely be the result of a failed voltage regulator.

Success in manual mode proves the exciter, field windings, and manual rheostat are operational. Failure exclusively in automatic voltage control mode isolates the fault directly to the automatic voltage regulator circuitry, solid-state components, or its sensing inputs, per IEEE 45 troubleshooting criteria.