Question 650Steam Plants - Assistant Engineer
70% to passWhat 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?
AVacuum will be lost.
BAhead throttle will close.
CLube oil sump will overflow.
DHP turbine bearings will overheat.
AI Explanation
The correct answer is B) Ahead throttle will close. If both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed, the loss of lube oil pressure will cause the ahead throttle to automatically close, shutting down the turbine. This is a standard safety feature designed to prevent catastrophic damage to the turbine bearings and other critical components due to lack of lubrication. The other answer choices are incorrect because: A) Vacuum would not be immediately lost, C) The lube oil sump would not overflow, and D) The HP turbine bearings would overheat, but this is a consequence of the loss of lubrication, not the first thing that happens.
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