Tennessee Wastewater Operator Practice Exam

What component is found in a single stage centrifugal blower?

1. Compressor

2. Diffuser

3. Impeller

4. Motor

The correct answer is: Impeller

In a single stage centrifugal blower, the impeller is a crucial component that plays a vital role in the blower's function. The impeller is designed to convert rotational energy, typically from a motor, into kinetic energy in the form of airflow. As the impeller rotates, it draws air into the center and then expels it outward at a higher velocity, creating pressure that moves the air through the system. This design allows for efficient air movement, which is essential in various applications, including wastewater treatment processes. The effectiveness of the impeller directly impacts the blower's performance in terms of flow rate and pressure, making it a key element in achieving the desired operational outcomes. While the other components mentioned—compressor, diffuser, and motor—may play roles in different types of systems or configurations, they are not exclusive or integral parts of a single stage centrifugal blower. For instance, a diffuser is used in certain applications to convert velocity into pressure but is not a standard component of a single stage centrifugal design. Similarly, although a motor is essential to provide the rotational energy, it is not considered part of the blower mechanism itself. The compressor typically refers to a different type of equipment focused more on increasing the pressure of gases than on airflow.