While standing watch in the engine room, you...

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Question 1 of 205eccef9bbacbc34ba4d454e8

While standing watch in the engine room, you hear a 'crackling' sound coming from within a salt water service system centrifugal pump. The most probable cause for this occurrence would be from an abnormal condition at the __________.

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🔍 Key Concepts

• Cavitation in centrifugal pumps and what it sounds like • How pressure at the suction vs. discharge affects formation of vapor bubbles • Which pump component is associated with low pressure and vapor bubble collapse

💭 Think About

• Think about where in a centrifugal pump the pressure is lowest and most likely to drop below the vapor pressure of the liquid. • Ask yourself: does cavitation noise (crackling/gravel sound) usually start where the liquid first enters the impeller, or where it is leaving at high pressure? • Which listed component is located in the area where liquid initially enters the pump and could experience inadequate Net Positive Suction Head (NPSH)?

✅ Before You Answer

• Identify which option is directly related to the inlet (low‑pressure) side of the pump. • Recall that cavitation is more likely with insufficient suction head, not with excess discharge pressure alone. • Make sure the choice you select corresponds to the component/area where vapor bubbles are most likely to form and then collapse, causing the crackling noise.

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