Tennessee Wastewater Operator Practice Exam

What method can be used to check the performance of a flow meter?

1. Observing flow rate visually

2. Checking calibration via digital readouts

3. Measure area and velocity in an open channel

4. Count the number of items processed

The correct answer is: Measure area and velocity in an open channel

Measuring both the area and velocity in an open channel is a reliable method to check the performance of a flow meter. This approach allows for the direct assessment of flow rate by calculating the product of cross-sectional area and velocity of the flow, typically through techniques such as a flow velocity meter or using established equations for flow in open channels. This calculation can then be compared to the readings provided by the flow meter, helping to determine its accuracy and effectiveness. In essence, this method provides a practical way to verify that the flow meter is functioning correctly, as it aligns measured values with actual physical parameters of the flow. By assessing both area and velocity, operators can obtain a comprehensive understanding of flow characteristics, contributing to better operational management and maintenance of wastewater systems.