ANS:A - turbine

The working of a turbine pump characterizes mixed flow. Here's why:

• Turbine Pump: A turbine pump is a type of centrifugal pump that operates with an axial flow impeller. The impeller design in a turbine pump allows for a combination of radial and axial flow characteristics. This results in a mixed flow pattern where the fluid both moves radially outward and axially through the impeller.
• Mixed Flow: Mixed flow pumps combine characteristics of both centrifugal and axial flow pumps. In these pumps, the fluid flows through the impeller in both radial and axial directions, resulting in a mixed flow pattern. This type of flow pattern is advantageous for applications where moderate to high flow rates and moderate heads are required.
• Other Options:
  • Piston Pump: Piston pumps operate based on reciprocating motion of pistons to displace fluid, and they typically do not characterize mixed flow.
  • Diaphragm Pump: Diaphragm pumps use a flexible diaphragm to create pressure differentials for fluid movement and do not typically exhibit mixed flow characteristics.