A simple, untapped, single-phase 480/120 VAC step-down control transformer is rated at 600VA at 60 Hz. Neglecting power factor, what is the rated secondary load current?

Correct Answer: Option C — 5 amperes

Secondary load current is determined using apparent power formulas where $I = \text{VA} / V_{\text{sec}}$. For a 600VA transformer operating at 120V secondary, $600 / 120 = 5\text{ amperes}$. IEEE 45 and 46 CFR Subchapter J mandate proper sizing of control transformers for shipboard automation circuits.