Maintenance Technician 2025 Complete Practice Test

Screw pumps, gear pumps, and moving vane pumps are classified as rotary pumps because they operate on the principle of rotating mechanisms to move fluids. In rotary pumps, the fluid is displaced by the rotation of a rotor or other rotating parts within the pump casing, creating a pressure differential that pushes the fluid through the system. This design allows for a continuous flow of liquid with relatively low pulsation.

Screw pumps utilize two or more helical screws to move fluid, gear pumps use interlocking gears to create a sealed chamber that moves fluid, and moving vane pumps rely on vanes that slide in and out of a rotor to create suction and discharge. All these types rely on rotational motion to function effectively, which is characteristic of rotary pumps.

In contrast, submersible pumps involve a different design intended for operation underwater or in a submerged environment. Reciprocating pumps function on a back-and-forth motion, typically using a piston mechanism, and centrifugal pumps rely on rotational energy to impart velocity to the fluid, using a different operational principle compared to rotary pumps. Therefore, identifying these pumps as rotary is accurate based on their mechanical operation and the way they handle fluid movement.