Centrifugal pump parts include a ___.

• A. Volute and Impeller
• B. Diaphragm and Piston
• C. Shaft and Gasket
• D. Piston and Rod

Answer: (A)

Centrifugal pumps rely on two features that define their operation: an impeller that adds energy to the fluid and a volute-shaped casing that directs and converts that energy into pressure. The impeller spins, throwing fluid outward and increasing its velocity and kinetic energy. The volute collects the fast-moving fluid and slows it down, transforming that velocity into pressure and directing flow toward the discharge. These two parts—impeller and volute—are the characteristic components of a centrifugal pump.

Diaphragm and piston belong to diaphragm or piston-type pumps, which use displacement rather than centrifugal force to move fluid. Shaft and gasket are common pump components across many types but do not define centrifugal pumps, and piston and rod are features of piston-type pumps.