Red Seal Industrial Mechanic (Millwright) Practice Exam

What is the function of bearings in machinery?

1. To connect multiple machined parts

2. To support rotating components and reduce friction

3. To transmit electrical impulses through the machine

4. To filter impurities from the applied lubricants

The correct answer is: To support rotating components and reduce friction

Bearings play a crucial role in the functioning of machinery by providing support for rotating components while significantly reducing friction between moving parts. Their primary function is to allow parts such as shafts and wheels to rotate smoothly without binding or seizing, which can result in wear and failure of the machinery. By providing a low-friction surface for these components to move against, bearings help to improve the efficiency of the machinery, as less energy is lost to frictional heat. Additionally, they help to stabilize and align components during operation, ensuring that mechanical systems operate smoothly and effectively. The other options pertain to different functions within machinery. While connecting machined parts is important, it does not specifically reflect the role of bearings. Transmitting electrical impulses relates more to electrical systems rather than mechanical components. Filtering impurities from lubricants is a task typically associated with filtration systems rather than the function of bearings themselves. Hence, supporting rotating components and reducing friction is the primary and correct function of bearings in machinery.