What category of pumps uses pistons, diaphragms, screws, lobes, gears, or vanes to move or push liquids?
A. Dynamic pumps
B. Centrifugal pumps
C. Rotary pumps
D. Positive displacement pumps
A. Incorrect. Dynamic pumps use impellers to generate centrifugal force.
B. Incorrect. Centrifugal pumps uses an impeller on a rotating shaft to generate pressure and move liquids.
C. Incorrect. Rotary pumps move in a circular motion to move liquids by trapping them in a specific area of a screw or a set of lobes, gears, or vanes.
D. Correct. Positive displacement pumps use pistons, diaphragms, screws, lobes, gears, or vanes to move or push liquids.
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