Question 332Steam Plants - 1st Asst/Chief70% to pass
An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by _______________.
AI Explanation
The correct answer is B) a carryover from the boiler.
Explanation:
An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by a carryover from the boiler. This is because the boiler is responsible for generating the steam that powers the turbine, and any issues with the boiler, such as carryover of water or other contaminants, can disrupt the smooth operation of the turbine and reduction gear.
The other options are incorrect because they do not directly relate to the specific symptoms described in the question. A labyrinth seal failure (A) or a reduction in condenser vacuum (D) would not necessarily cause the described vibration and rumbling sound. Overloading of the condenser (C) is also unlikely to be the cause of the issue.
Related Questions
#330 Babbitt is a metal alloy commonly used for lining _______________.#331 Most main propulsion reduction gear bearings are _______________.#333 Raising vacuum on a main turbine unit without using the turning gear will result in _______________.#334 Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by _______________.#335 If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should _______________.