What will be the FIRST thing to occur if both the main and standby lube oil pumps failed to operate on a geared main propulsion steam turbine operating at full sea speed?

Correct Answer: Option A — Ahead throttle will close.

Marine steam propulsion safety interlocks feature low lube oil pressure trips. If both main and backup pumps fail, pressure drops instantaneously, automatically tripping and closing the ahead maneuvering throttle to protect high-speed bearings from catastrophic failure.