What type of pump uses impellers to generate outward force?
A) Dynamic
B) Plunger
C) Piston
D) Positive displacement
Answer: A
Explanation: A) Correct. Dynamic pumps of the centrifugal type use impellers to generate outward (centrifugal) force, which is then converted to dynamic pressure in the volute to move liquids.
B) Incorrect. Positive displacement pumps use pistons, lobes, gears, screws, or vanes to move or "push" liquids.
C) Incorrect. Positive displacement pumps use pistons, lobes, gears, screws, or vanes to move or "push" liquids.
D) Incorrect. Positive displacement pumps use pistons, lobes, gears, screws, or vanes to move or "push" liquids.
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