What is a characteristic of all centrifugal cargo pumps?

A characteristic of all centrifugal cargo pumps is that decreasing the speed of rotation will decrease the discharge pressure. This is due to the fundamental operation principles of centrifugal pumps, which utilize rotational energy to move fluids. As the pump's impeller speed decreases, the kinetic energy imparted to the fluid diminishes, resulting in a reduction in discharge pressure. Therefore, pump performance is directly related to the speed at which the impeller rotates; when that speed decreases, the discharge (or outlet) pressure naturally follows suit.

Conversely, increasing the speed of rotation generally leads to a corresponding increase in discharge pressure, but that is not the correct answer to this question's focus. While centrifugal pumps primarily handle liquids, the statement that they can only pump liquids does not account for variations in pump design and application. Lastly, requiring a constant flow rate is not characteristic of centrifugal pumps; they can operate across a range of flow rates effectively as long as they remain within their design specifications.