Tennessee Wastewater Operator Practice Exam

What is a good indication that the filter in the air distribution system needs to be cleaned or changed?

1. Loud operational noise

2. Manometer reading increases more than two or three inches from initial reading

3. Frequent blower shutdowns

4. Unusual vibrations during operation

The correct answer is: Manometer reading increases more than two or three inches from initial reading

A good indication that the filter in the air distribution system needs to be cleaned or changed is when the manometer reading increases more than two or three inches from the initial reading. The manometer is a device used to measure the pressure drop across the filter, and a significant increase in reading indicates that the filter is becoming clogged or dirty. This pressure increase occurs because the airflow is being restricted, which directly impacts the efficiency of the system. Regular monitoring of manometer readings is crucial for maintaining optimal performance and ensuring that the system continues to operate effectively. While other options may suggest operational issues, they are not specifically indicative of filter performance. Changes in noise, blower shutdowns, and vibrations can result from a variety of mechanical or operational factors that don't directly correlate to filter condition, making the manometer reading the most reliable indicator for this scenario.