Oilers/Plant Tenders (HHC) Civil Service Practice Exam 2026 - Free Oilers & Plant Tenders Practice Questions and Study Guide

The shallow U groove is considered the most preferable option for grooving bearings due to its design that allows for effective lubrication and ease of movement. The U shape provides a wider space for grease or oil, which is vital for minimizing friction between moving parts. This allows for better distribution of lubricant around the bearing surfaces, ensuring that all parts are adequately lubricated.

Additionally, a shallow U groove supports proper alignment of the bearing balls or rollers, which aids in maintaining the overall structural integrity of the bearing during operation. The shallow profile reduces the risk of trapping debris, which can occur in deeper grooves, potentially hindering performance or causing wear.

In contrast, the other groove types may not provide the same balance of lubrication and structural support. Deep U grooves, while they do allow for some lubrication, can create more space for contaminants, leading to potential issues. Shallow V grooves might limit the amount of lubricant retained, and circular grooves may not facilitate the necessary lubrication effectiveness or structural support typical of bearings in motion.