What is the purpose of the device labeled 'Man-Auto Sw.' in the illustrated switchboard? EL-0003

Correct Answer: Option B — shift from the automatic voltage regulator to manual voltage control or vice versa

Automatic Voltage Regulators (AVR) maintain steady output during load changes. The 'Man-Auto' switch provides a critical safety bypass, allowing the operator to manually control the generator field excitation if the AVR fails. This ensures continuity of power generation, a requirement for reliable shipboard electrical distribution under IEEE 45 standards.