Question 336Steam Plants - 1st Asst/Chief70% to pass
A common cause of the Babbitt linings cracking in a turbine journal bearing is from _______________.
AI Explanation
The correct answer is D) vibration generated by the rotor.
The Babbitt lining in a turbine journal bearing is susceptible to cracking due to excessive vibration from the rotor. Vibrations can cause fatigue and wear in the Babbitt lining, leading to cracking over time. This is a common failure mode for turbine bearings.
The other options are incorrect because: A) low-speed operation would not directly cause Babbitt cracking, B) full-speed operation alone does not necessarily lead to Babbitt failure, and C) excessive thrust bearing wear, while problematic, does not directly impact the journal bearing Babbitt lining.
Related Questions
#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 _______________.#337 When a turbine bearing shows signs of overheating, you should _______________.#338 The original bridge gage reading for a reduction gear bearing was measured as .008 inches. A year later, the bridge gage reading for the same bearing is .010 inches. This indicates _______________.#339 The main propulsion turbine can be damaged by _______________.