NCCER Millwright Practice Exam

What is a common indicator of false brinelling in bearings?

1. Frequent lubrication required

2. Marks on the races at regular intervals

3. Excessive noise during operation

4. Overheating of components

The correct answer is: Marks on the races at regular intervals

A common indicator of false brinelling in bearings is the appearance of marks on the races at regular intervals. False brinelling is a form of wear that occurs when bearings are subjected to vibrational forces while at rest, which can lead to the formation of small indentations or marks on the races. These marks are typically aligned in a pattern, indicating the motion of the rolling elements against the raceway due to vibrations, even when there is no actual rotation of the bearing. This phenomenon can compromise the integrity of the bearing and potentially lead to premature failure if not addressed. Other indications, like the necessity for frequent lubrication, excessive noise during operation, or overheating of components, may be related to different kinds of bearing issues or failures but are not specific indicators of false brinelling. Frequent lubrication may suggest inadequate coverage or contamination rather than false brinelling specifically. Excessive noise can indicate other mechanical problems, while overheating may signal issues with alignment or excessive friction, rather than the specific marker of false brinelling.