Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What is the primary purpose of thrust bearings?

1. To support rotating shafts

2. To prevent lengthwise motion of a rotating shaft

3. To reduce friction between the surfaces

4. To absorb shock loads

The correct answer is: To prevent lengthwise motion of a rotating shaft

The primary purpose of thrust bearings is to prevent lengthwise motion of a rotating shaft. These bearings are specifically designed to handle the axial loads and support the rotating shaft’s end movement. Unlike radial bearings, which support the shaft's weight and prevent horizontal movement, thrust bearings focus on managing forces that act parallel to the shaft's axis, thereby ensuring that the shaft remains in its designated position without unwanted axial displacement. This is particularly important in applications where precision and stability are critical, as misalignment can lead to premature wear or failure of the rotating assembly. Understanding the distinction of thrust bearings is crucial for various industrial applications, especially in machinery where axial loads are common, such as in turbines or heavy machinery. The specific role of thrust bearings to manage axial loads makes their function indispensable in maintaining the integrity and performance of rotating systems.