The three main types of these devices are axial flow, centrifugal, and positive displacement. For 10 points each:
[10e] Name these devices that mechanically move or transfer energy to a fluid. Homeowners prevent basement flooding during rainstorms by using these devices to transfer water out of a sump basin.
ANSWER: pumps [accept sump pumps]
[10m] A principle cause of routine wear-and-tear to pumps is this phenomenon in which a sudden large pressure drop below the vapor pressure is followed by energy release via shock waves when the pressure is increased.
ANSWER: cavitation [prompt on, but DO NOT REVEAL, head loss]
[10h] This quantity measures the tendency of a pump to resist cavitation. This value is the difference between the suction-side and vapor values of a quantity calculated as pressure over the product of fluid density and little g.
ANSWER: net positive suction head [or NPSH; prompt on partial answers that include “head”]
<Billy Busse, Physics>