Name two types of bearings used in centrifugal pumps.

• A. Sleeve bearings and Bronze bearings
• B. Sleeve bearings and Bushings
• C. Sleeve bearings and Ball bearings
• D. Ball bearings and Bushings

Answer: (C)

Bearings in centrifugal pumps fall into two broad families: sleeve bearings, which are plain bearings that rely on a lubricating film to separate surfaces and absorb radial loads, and ball bearings, which are rolling-element bearings that dramatically reduce friction and handle higher speeds with better precision. Sleeve bearings provide durable, quiet operation at moderate speeds and loads, while ball bearings enable higher rotational speeds, tighter alignment, and longer life under demanding conditions. Many pump designs use both types to support the rotor effectively—sleeve bearings for main radial support and ball bearings at the ends to take thrust and improve overall efficiency. This combination covers a wide range of operating conditions you’re likely to encounter in centrifugal pumps.