Question 51Steam Plants - QMED

The correct answer is B) high temperature of the lube oil leaving the bearing. An overheated bearing in the main propulsion unit would be indicated by an abnormally high temperature of the lube oil as it exits the bearing. This is because the increased friction and heat generation in an overheated bearing would transfer that excess heat to the lubricating oil, causing it to exit the bearing at a higher temperature. The other answer choices are incorrect because they do not directly indicate an overheated bearing. A high level in the lube oil sump (A), bubbles in the sight flow glasses (C), or sludge in the lube oil strainers (D) could be caused by other issues and do not necessarily point to an overheated bearing.