Question 75General Subjects - Assistant Engineer

70% to pass

What is the primary indication of a grease lubricated bearing that is over-lubricated in terms of the quantity of grease in the housing?

AThe bearing temperature would tend to produce unusual vibrations.

BThe bearing temperature would tend to run cooler than normal for the load.

CThe bearing would tend to produce a noticeable change in sound.

DThe bearing temperature would tend to run hotter than normal for the load.

AI Explanation

The correct answer is D) The bearing temperature would tend to run hotter than normal for the load. When a grease lubricated bearing is over-lubricated, the excess grease creates increased drag and friction within the bearing, leading to higher temperatures. This is because the excess grease must be churned and compressed, which requires additional energy that is dissipated as heat. The other options are incorrect because over-lubrication does not typically cause unusual vibrations, cooler temperatures, or noticeable changes in sound. The increased heat generation is the primary indication of an over-lubricated grease bearing.