If a centrifugal pump is driven by a...

Question 1 / 270705eccef9bbacbc34ba4d454c4

Question 1 of 270705eccef9bbacbc34ba4d454c4

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably __________.

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Question 1 of 27070

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably __________.

🔍 Key Concepts

• centrifugal pump performance at constant speed (head vs. flow) • Effect of internal leakage (e.g., clearances, wearing rings) on discharge pressure • Difference between speed problems, suction conditions, and mechanical alignment issues

💭 Think About

• For each choice, ask yourself: would this condition tend to increase or decrease the discharge pressure, and why? • Which option directly allows liquid to leak back from high-pressure (discharge) side to low-pressure (suction) side inside the pump? • Which conditions would mainly cause noise, vibration, or bearing problems rather than a simple reduction in discharge pressure at a fixed speed?

✅ Before You Answer

• Remember that the motor speed is constant, so anything that relies on speed changing is unlikely here. • Think about which component, when worn, increases clearances and reduces the pump’s ability to build pressure. • Separate hydraulic issues inside the pump from mechanical alignment issues between pump and motor when choosing your answer.

Question 1 of 27070

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably __________.

excessive pump speed

excessive suction head

worn wearing rings

gross pump misalignment

Question 1 / 270705eccef9bbacbc34ba4d454c4

Question 1 of 270705eccef9bbacbc34ba4d454c4

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably __________.

Back

Question 1 of 27070

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably __________.