Question 71General Subjects - Assistant Engineer

The correct answer is C) vibration while the bearing is not in operation. Vibration while the bearing is not in operation can cause indentation or denting in the race of an antifriction bearing. This is because the rolling elements (e.g., balls or rollers) can move around and impact the bearing races, even when the bearing is not under load or in operation. This can lead to deformation and damage to the bearing races over time. The other options are incorrect because water, dirt, or abrasives in the lubricant can cause different types of bearing damage, such as corrosion, contamination, or accelerated wear, but they would not specifically lead to denting of the bearing races when the bearing is not in operation.