USCG USCG General Eng
Set 14 • Question #152 of 498
Launch Interactive Practice Room In which of the following descriptions would centrifugal pump impeller cavitation most likely occur if the impeller diameters, rotating speed, and liquid temperature are the same?
A
In the second stage of a two-stage pump.
B
A single-stage impeller with straight vanes.
C
A single-stage impeller with curved vanes.
✓ Correct Answer
D
A two-stage pump with an operating speed 100 RPM less than specified.
USCG NMC Regulatory Explanation
Cavitation occurs when local static pressure inside a pump drops below liquid vapor pressure, forming vapor bubbles that collapse violently in higher pressure regions, causing noise, vibration, and metal pitting erosion.
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