In pump design, which component has an impeller?

In pump design, which component has an impeller?

• A. centrifugal
• B. positive displacement
• C. axial flow
• D. jet

Answer: (A)

An impeller is the rotating element that transfers energy to the fluid. In pump design, this energy transfer is most closely associated with centrifugal pumps: the impeller spins inside the casing, accelerating the fluid outward and increasing its velocity, which the diffuser or volute then converts into pressure. Positive-displacement pumps move fluid by trapping a fixed volume—using pistons, diaphragms, or gears—without relying on a rotating impeller. Jet pumps generate suction and move water through a jet and entrainment mechanism rather than by an internal rotating impeller. So the component that uses a rotating impeller to impart energy to the fluid is the centrifugal pump.

An impeller is the rotating element that transfers energy to the fluid. In pump design, this energy transfer is most closely associated with centrifugal pumps: the impeller spins inside the casing, accelerating the fluid outward and increasing its velocity, which the diffuser or volute then converts into pressure. Positive-displacement pumps move fluid by trapping a fixed volume—using pistons, diaphragms, or gears—without relying on a rotating impeller. Jet pumps generate suction and move water through a jet and entrainment mechanism rather than by an internal rotating impeller. So the component that uses a rotating impeller to impart energy to the fluid is the centrifugal pump.