Which pump uses vanes to trap and move fluid by sliding inside a rotor slot?

• A. Centrifugal Pump
• B. Gear Pump
• C. Screw Pump
• D. Vane Pump

Answer: (D)

Vane pumps move fluid by vanes that slide in slots on a rotating rotor. As the rotor turns, the vanes are pushed outward to stay in contact with the pump casing, creating sealed pockets between adjacent vanes. These pockets grow and shrink in volume as the rotor spins, drawing fluid in on the suction side and pushing it out on the discharge side. That sliding-vane mechanism inside a rotor slot is the defining feature of a vane pump. The other pump types operate differently: a centrifugal pump uses an impeller to fling fluid outward; a gear pump traps fluid between intermeshing gears; a screw pump moves fluid through cavities formed by intermeshing screws.