Correct AnswerC. continuous operation at or near the maximum efficiency capacity of the pump.
Quick Explanation
A centrifugal pump experiences minimum hydraulic imbalance, vibration and recirculation when operated near its best-efficiency point (BEP). Continuous operation close to the maximum-efficiency capacity therefore promotes long pump life, making option C correct.
Detailed Explanation
Correct Answer
C — continuous operation at or near the maximum efficiency capacity of the pump.
Concept and Reasoning
A centrifugal pump experiences minimum hydraulic imbalance, vibration and recirculation when operated near its best-efficiency point (BEP). Continuous operation close to the maximum-efficiency capacity therefore promotes long pump life, making option C correct.
Calculation / Key Relation
Operate near BEP for minimum hydraulic losses and vibration
Exam Takeaway
BEP is the pump’s preferred continuous operating region.
Common Mistake
Operating with inadequate NPSH promotes cavitation and shortens pump life.
