The specific speed of a centrifugal pump is defined as the speed (rpm) at which a geometrically similar pump delivers unit discharge at unit head. A pump has high specific speed when it is:
Choose the correct answer
Suited for high head, low flow (Pelton-like)
Suited for low head, high flow (axial flow type)
Designed for very viscous fluids
Operated at low rpm only
Correct Answer
B. Suited for low head, high flow (axial flow type)
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High specific speed pumps (axial flow type) handle large discharges at low heads. Low specific speed pumps (centrifugal, radial flow) handle small discharges at high heads. Ns = N x sqrt(Q) / H^(3/4).
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