What type of pump has no radial component to the discharge from its impeller?

• A. Axial flow
• B. Centrifugal pump
• C. Positive displacement pump
• D. Diaphragm pump

Answer: (A)

An axial flow pump is characterized by the way it moves fluid through the system. In this type of pump, the fluid enters the impeller and is directed along the axis of the pump, resulting in a purely axial flow. There are no radial components involved in the discharge because the flow is essentially linear, extending in the same direction as the pump shaft. This allows axial flow pumps to be particularly efficient for large volumes of water, especially in applications such as irrigation or circulation systems.

Other types of pumps, like centrifugal pumps, generate flow through a radial discharge due to the rotational movement of the impeller, causing the fluid to be flung outward. Positive displacement and diaphragm pumps operate differently; they create flow by trapping a fixed amount of fluid and then displacing it through the discharge, but they still involve some form of radial or volumetric displacement mechanism. Thus, the distinctive feature of axial flow pumps is that they achieve flow without any radial movement of the water, making option A the precise answer.