Basic Wastewater Operator Practice Exam

A centrifugal pump primarily relies on an impeller to create fluid movement. The impeller is a rotating component that transfers energy to the fluid, causing it to flow. As the impeller spins, it flings the fluid outwards due to centrifugal force, resulting in an increase in pressure and flow rate. This mechanism is fundamental for the operation of centrifugal pumps, making the impeller a critical component.

The other components mentioned do not play the same role. A primer, for instance, is used to remove air from the pump's casing to facilitate priming, but it is not a core part of the centrifugal pump's function. A hose bib is an outlet valve for water, commonly found in plumbing fixtures rather than as part of a pump's operation. Lastly, a piston is associated with positive displacement pumps, which operate differently than centrifugal pumps. Understanding the role of the impeller helps in grasping the basic mechanics of centrifugal pumps and their functionality in wastewater treatment systems.