As shown in the illustrated wiring diagram for an engine order telegraph system, what statement concerning the constant ringing and trouble alarm is true? Illustration EL-0113

Correct Answer: Option C — The constant ringing and trouble alarm sounds when the acknowledge handle and indicator arrow are not on the same order.

Engine order telegraph systems incorporate audible and visual supervisory alarms. Per 46 CFR Subchapter J requirements, the constant ringing and trouble alarm actuates immediately whenever the bridge transmitter order and the engine room receiver indicator fail to match within designated tolerances, alerting personnel to transmission failures.