Question

Which type of bearing is best suited for high-speed applications with moderate radial loads?

• A. Plain (sliding) bearing
• B. Ball bearing
• C. Roller bearing
• D. Thrust bearing

Hint:

Point contact = low friction, high speed, moderate load (Ball Bearings).
Line contact = high friction, lower speed, heavy load (Roller Bearings).
This simple rule helps select the correct bearing type.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks to identify the type of bearing most suitable for high-speed applications carrying moderate radial loads.

Step 2: Key Formula or Approach: The choice of bearing depends on load magnitude, load direction, and operating speed. Rolling contact bearings are divided into ball bearings (point contact) and roller bearings (line contact).

Step 3: Detailed Explanation:

• Ball bearings use spherical rolling elements that make point contact with the raceways.

• This point contact keeps friction low, which minimizes heat generation and allows ball bearings to operate at high speeds.

• However, because contact is localized to a point, they are suitable for moderate radial loads.

• Roller bearings (Option C) use cylindrical rolling elements that make line contact. This increases load capacity but generates more friction, making them less suitable for high speeds.

• Plain bearings (Option A) are used for very heavy loads at low-to-medium speeds or under hydrodynamic lubrication.

• Thrust bearings (Option D) are designed to support axial (thrust) loads, not radial loads.

Step 4: Final Answer:
A ball bearing is the best type of bearing for high-speed applications with moderate radial loads.