Which of the following is NOT listed as a pump type in the material?

• A. Gear Pump
• B. Centrifugal
• C. Progressive Cavity Pumps
• D. Reciprocating or Piston Pumps

Answer: (A)

Understanding which pump types the material lists helps you identify what to study. The material names centrifugal pumps, progressive cavity pumps, and reciprocating or piston pumps. Gear pumps aren’t listed in this material, even though they’re a known positive-displacement design. They use intermeshing gears to move fluid, often for viscous liquids, but since they aren’t included in the list, this is the option that isn’t listed. The other types are included in the material: centrifugal pumps move fluid with an impeller for high flow, progressive cavity pumps use a rotor and stator to displace fixed volumes, and reciprocating or piston pumps create displacement with a piston per stroke.