Which type of feeder is most likely to feed clear solutions?

The correct answer is that a rotameter is the type of feeder most likely to feed clear solutions because it operates based on the principle of variable area flow measurement. This device allows for accurate measurement and control of flow rates of liquids and gases, making it effective for delivering clear solutions. The design of a rotameter typically includes a tapered tube and a float or ball that rises and falls with changes in flow rate, providing a visual indication of the flow and ensuring a consistent delivery of fluid without substantial mixing or disruption.

Rotameters are widely used in applications where clarity and precision are essential, as they are generally designed not to disturb the liquid being measured, thus maintaining its clarity. Other options, such as decanters, orifices, and positive displacement feeders, are often used for different types of applications and may not be suited for handling clear solutions efficiently. Decanters are typically employed for separating solids from liquids, orifices are used to control or measure flow but can create turbulence, and positive displacement feeders are more suited for viscous or non-Newtonian fluids, making them less ideal for handling clear solutions.