Which one is not centrifugal pump?

WBPSC AE 2003: Mechanical Engineering

⭕ (a) Volute

⭕ (b) Diffuser

⭕ (c) Reciprocating

⭕ (d) Turbine

Explanation: Centrifugal pumps are rotodynamic radial flow pumps, used for continuous high-flow applications. They are mainly of two types:

• Volute Pump – Uses a spiral casing to collect fluid.
• Diffuser or Turbine Pump – Uses stationary vanes to convert velocity into pressure.

On the other hand, Reciprocating pumps are positive displacement pumps, not centrifugal. They operate with back-and-forth motion to push fluid.

Centrifugal vs Reciprocating Pump

This MCQ highlights a key difference in pump types. Understanding classifications like centrifugal (dynamic) vs reciprocating (positive displacement) is crucial in Mechanical Engineering competitive exams.

Key Differences

• Centrifugal Pump: Continuous flow, high discharge, low pressure.
• Reciprocating Pump: Intermittent flow, low discharge, high pressure.

Conclusion:

The correct answer is Reciprocating. It's not a centrifugal pump, but a positive displacement pump. This concept is frequently tested in exams like WBPSC AE, SSC-JE, and GATE.

Also Read: Check Valve Direction Control - Fluid Mechanics MCQ