What is a characteristic of a diaphragm pump?

• A. High capacity for water delivery
• B. Small capacity relative to cost
• C. Low maintenance required
• D. Suitable for sludge handling

Answer: (B)

A diaphragm pump is primarily known for its ability to handle various fluids, including those with particles or viscous properties, making it suitable for applications such as sludge handling. This pump type operates by utilizing a flexible diaphragm that moves back and forth, creating suction and delivering fluid effectively.

The characteristic of a small capacity relative to cost highlights that diaphragm pumps are often compact and designed for specific applications where lower flow rates are sufficient. Their construction, which can include materials resistant to corrosion and wear, allows for efficient handling of difficult substances, but this does not equate to high flow rates like some other pump types.

Considering suitable options, although diaphragm pumps can be low maintenance due to fewer moving parts compared to centrifugal pumps, the maintenance aspect can vary based on the application and fluid characteristics. Therefore, while low maintenance is beneficial, it does not define the pump's primary characteristics, nor does high capacity for water delivery accurately describe a diaphragm pump’s primary use case. Thus, the small capacity relative to cost is a more precise identification of what defines diaphragm pumps in the context given.