Centrifugal pump specific speed classification: Ns = 160 to 500 (rpm-based form) Interpret the flow direction at outlet associated with this specific speed band. Choose the most suitable description.
Mechanical Engineering
Hydraulic Machines
Difficulty: Easy
Choose an option
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ASlow speed with radial flow at outlet
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BMedium speed with radial flow at outlet
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CHigh speed with radial flow at outlet
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DHigh speed with axial flow at outlet
Answer
Correct Answer: High speed with axial flow at outlet
Explanation
Concept/Approach
- Specific speed (rpm form) classifies pumps by type: low Ns → radial-flow; intermediate Ns → mixed-flow; high Ns → axial-flow.
ReasoningA value in the range of 160–500 rpm indicates high specific speed behavior trending toward axial-flow characteristics, used for high discharge and low head duties.
Final AnswerHigh speed with axial flow at outlet.