A positive displacement pump is characterized by:

A positive displacement pump is characterized by its ability to discharge a fixed or equal amount of fluid with each cycle it completes. This mechanism operates by trapping a specific volume of liquid and forcing it through the discharge outlet. As a result, regardless of the pressure conditions in the system, the pump delivers a consistent volume of fluid, which is a defining feature of positive displacement technology.

This characteristic allows for predictable and controllable fluid delivery, making these pumps particularly useful in applications where precise flow rates are critical. Such dependability contrasts with other types of pumps, which may vary their output based on pressure.

The other options do not accurately describe the characteristics of a positive displacement pump. For example, unlimited suction capabilities pertain more to centrifugal pumps, which manage operational requirements differently. Positive control over discharge pressures can vary across different pump types and does not uniquely define positive displacement pumps. Lastly, while they can handle a range of fluids, including hydraulic fluids, they are not limited to just those, making that option inaccurate as well.