Water Distribution Grade 1 Certification Practice Exam

What best describes a double suction pump?

1. It functions by using a single impeller

2. Water enters the impeller from two sides

3. It has a single suction and double discharge

4. It is only used in high-pressure applications

The correct answer is: Water enters the impeller from two sides

A double suction pump is characterized by its impeller design, which allows water to enter the impeller from two sides simultaneously. This design leads to a more balanced operation and reduces axial thrust, which can extend the lifespan of the pump and improve efficiency. The dual entry of fluid helps achieve higher flow rates and better performance in handling larger volumes of liquid, making it a popular choice in various applications, especially in water distribution systems. The other options, although they describe different aspects of pump operation or design, do not accurately convey the fundamental feature that defines a double suction pump. For instance, mentioning a single impeller mischaracterizes the design, as a double suction pump indeed utilizes an impeller that employs suction on both sides. The statement regarding single suction and double discharge does not align with the typical configuration of a double suction pump either. Additionally, while double suction pumps can be suitable for high-pressure applications, stating that they are only used in such contexts limits their versatility and does not reflect their broader applicability in various pressure settings.