Question 402Steam Plants - 1st Asst/Chief70% to pass
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?
AI Explanation
The correct answer is A) Ahead throttle will close.
When 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. This is a safety feature designed to protect the turbine bearings from overheating and potential damage due to the lack of lubrication. The other options are incorrect because: B) the lube oil sump will not overflow, C) the HP turbine bearings will overheat but this is not the first thing that happens, and D) the loss of lube oil pressure will not directly cause a loss of vacuum.
Related Questions
#400 Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing? #401 Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears? #403 When an oil purification centrifuge loses a portion of its seal, the oil can then be discharged through the heavy phase discharge port. This is partly a result of greater _______________.#404 When the flow of oil admitted to a disk-type centrifugal purifier is in excess of its designed capacity, which of the following conditions will usually occur? #405 In the illustrated device, what would be a reason for oil being discharged from port "N"? Illustration GS-0124