Which option correctly states a characteristic of a centrifugal pump?

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

Answer: (D)

The key idea is that a centrifugal pump relies on an impeller to impart energy to the fluid and a volute housing to collect that flow and convert the imparted velocity into pressure. The impeller rotates, pushing fluid outward and increasing its kinetic energy, while the volute guides the moving fluid and slows it down in a way that raises pressure. Together, these two components—the impeller and the volute—define how a centrifugal pump operates. The other options describe parts used in different types of pumps or generic machinery elements, which don’t capture the pump’s characteristic mechanism.