Which of the following problems will occur...

Question 1 / 270705eccef9bbacbc34ba4d454d1

Question 1 of 270705eccef9bbacbc34ba4d454d1

Which of the following problems will occur when the suction valve is throttled on a centrifugal pump not designed to operate in this manner?

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Question 1 of 27070

Which of the following problems will occur when the suction valve is throttled on a centrifugal pump not designed to operate in this manner?

🔍 Key Concepts

• Centrifugal pump characteristics when suction is restricted • How cavitation develops at the eye of the impeller • Relationship between capacity (flow), efficiency, and NPSH when throttling on the suction vs. discharge side

💭 Think About

• Think about what happens to the pressure at the pump inlet when you close down (throttle) the suction valve—does it go up or down, and how does that affect the liquid? • Compare the usual, recommended way to control flow on a centrifugal pump (suction side or discharge side?) and recall why one method is avoided. • Consider which of the listed outcomes is gradual and related to performance, and which are extreme failures that would more likely require severe misoperation or long abuse.

✅ Before You Answer

• Verify what low NPSH (Net Positive Suction Head) does to liquid at the pump inlet and how that relates to bubble formation and noise/vibration. • Check which option mentions both reduced efficiency and a phenomenon specifically associated with low inlet pressure. • Eliminate choices that describe immediate catastrophic damage (like instant seizure or irreparable shaft damage), and favor the one that describes a realistic operational consequence of throttling the suction.

Question 1 of 27070

Which of the following problems will occur when the suction valve is throttled on a centrifugal pump not designed to operate in this manner?

The pump will immediately overheat and seize.

Pump efficiency is reduced and cavitation will be induced.

The pump packing will fail causing irreparable damage to the pump shaft.

Pump capacity is reduced and overall efficiency will be increased.

Question 1 / 270705eccef9bbacbc34ba4d454d1

Question 1 of 270705eccef9bbacbc34ba4d454d1

Which of the following problems will occur when the suction valve is throttled on a centrifugal pump not designed to operate in this manner?

Back

Question 1 of 27070

Which of the following problems will occur when the suction valve is throttled on a centrifugal pump not designed to operate in this manner?