Which of the following best describes the primary function of a hydraulic motor?

The primary function of a hydraulic motor is to generate power. Hydraulic motors convert the hydraulic energy, which is provided by pressurized fluid, into mechanical energy. This process allows the motor to produce rotational motion, often used in various mechanical applications such as machinery and vehicles.

The hydraulic fluid's pressure acts on the motor's components, which translates into torque and rotational movement. This makes hydraulic motors essential in applications that require high torque at low speeds, as they efficiently use pressurized fluid to create motion.

In contrast, the other choices do not accurately capture the primary role of a hydraulic motor. Generating electrical energy refers to operations like those done by generators or alternators, which is distinct from the functions of hydraulic systems. Storing energy is a role more aligned with hydraulic accumulators and other energy storage devices. Increasing fluid velocity relates to hydraulic systems but is more relevant to components designed to control fluid flow rather than to convert that energy into power. Thus, the correct understanding centers around the hydraulic motor's ability to transform hydraulic energy into useful mechanical work.