What is the FIRST thing that will happen if both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed?

Correct Answer: Option B — Ahead throttle will close.

Main propulsion turbines feature lube oil safety interlocks tied to the governor control system. Loss of lube oil pressure immediately trips the low-pressure oil relay, securing the ahead throttle via spring-loaded dump valves to prevent catastrophic gear and bearing destruction.