A gear pump is classified as which type of pump?

• A. Centrifugal pump
• B. Positive displacement pump
• C. Submersible pump
• D. Diaphragm pump

Answer: (B)

A gear pump is classified as a positive displacement pump because it works by trapping a fixed amount of fluid and then forcing that trapped fluid into the discharge pipe. The operation of a gear pump involves the interlocking gear mechanisms that create a void into which the fluid enters, and as the gears continue to rotate, the fluid is displaced from the inlet side to the outlet side of the pump. This mechanism allows for a consistent flow rate regardless of the system pressure, which is a characteristic of positive displacement pumps.

Unlike centrifugal pumps, which rely on rotational energy to impart velocity to the fluid and are affected by changes in system pressure, gear pumps maintain a constant flow by displacing a specific volume of fluid. This makes them particularly useful in applications requiring high viscosity fluids or precise flow rates, highlighting their efficiency in moving fluids against varying pressures. Understanding the mechanism of a gear pump is crucial for applications in wastewater treatment and other industrial processes where effective fluid management is required.