Two individual centrifugal pump impellers of...

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Question 1 of 205eccef9bbacbc34ba4d45461

Two individual centrifugal pump impellers of the same diameter, width, and rotating speed are to be compared, one is cast with straight vanes, the other with curved vanes. Which of the following statements is correct?

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🔍 Key Concepts

• Centrifugal pump impeller design and how vane shape affects flow and pressure • How straight vs curved vanes influence flow path, velocity, and hydraulic losses • Basic cause of cavitation in pumps: low pressure zones at the eye of the impeller

💭 Think About

• Think about how water actually moves through straight vanes versus smoothly curved vanes. Which design tends to create more shock, turbulence, and sudden changes in direction? • Consider which vane shape would more gently guide the fluid into and through the impeller passages, and how that affects local pressure at the eye of the impeller. • Ask yourself: does a "higher capacity" or "higher discharge pressure" always follow just from the vane being straight, if all other dimensions and speed are the same?

✅ Before You Answer

• Compare the likelihood of flow separation and turbulence between straight and curved vanes. • Recall that cavitation occurs where pressure drops toward vapor pressure; which vane design is more likely to create very low local pressures? • Check whether any option uses the word "always" in a way that seems too absolute for real machinery behavior.

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