What characteristic defines a centrifugal pump's rotor assembly?

• A. It is stationary and directs fluid flow
• B. It holds the motor and reduces vibrations
• C. It consists of the rotating components of the pump
• D. It adds resistance to fluid movement

Answer: (C)

The characteristic that defines a centrifugal pump's rotor assembly is that it consists of the rotating components of the pump. In centrifugal pumps, the rotor assembly, also known as the impeller, is crucial as it is responsible for imparting kinetic energy to the fluid, thereby enabling the movement of the fluid through the pump. As the rotor spins, it creates a centrifugal force that pushes the fluid outwards, generating flow and pressure.

Understanding the rotor assembly’s role in fluid dynamics is essential for recognizing how centrifugal pumps operate effectively in various applications. The impeller rotates, drawing fluid into the center (the eye of the impeller) and forcing it outward along the volute or diffuser, which converts the kinetic energy into pressure. This dynamic action is foundational to the function of a centrifugal pump.