What is one disadvantage of rotary pumps?

The disadvantage that rotary pumps can be noisy and prone to wear is significant due to their design and operational characteristics. Rotary pumps, which utilize rotating components to move fluid, often involve mechanical parts that can generate noise levels during operation. Additionally, the continuous engagement of these components leads to wear over time, which can affect the efficiency and lifespan of the pump. Being subjected to high operational stresses due to their design can further contribute to this wear and noise issue. Thus, the combination of these factors makes this option a valid concern for users considering the application and maintenance of rotary pumps.

While it's true that rotary pumps may require maintenance, the extent and frequency can vary widely depending on the specific application and installation. They can operate at various speeds depending on their design and purpose, which does not inherently categorize them as problematic in all situations. Lastly, while certain rotary pumps are designed for specific types of liquids, many can handle a range of fluids, making the limitation of handling only specific liquids a less universal disadvantage compared to noise and wear issues.