What is the role of the rotor in a centrifugal pump?

• A. To stabilize the external pressure on the pump
• B. To absorb and dissipate excess heat
• C. To assemble all rotating parts of the pump
• D. To control the speed of the driven equipment

Answer: (C)

The rotor in a centrifugal pump plays a critical role in facilitating the movement of fluid through the pump. It is the component that rotates within the pump casing and imparts kinetic energy to the fluid. As the rotor spins, it generates centrifugal force, which propels the fluid radially outward from the center of the pump, increasing its velocity and converting that kinetic energy into pressure energy. This process is essential for achieving the pump’s operational goal of moving fluids efficiently through a piping system.

The other choices do not accurately describe the function of the rotor. While stabilizing external pressure, dissipating heat, or controlling speed are important aspects of pump operation and performance, they do not specifically align with the primary task of the rotor in a centrifugal pump. The correct answer emphasizes the rotor's pivotal role in the mechanical action that drives fluid movement, which is fundamental to the design and functionality of centrifugal pumps.