Water Distribution Grade 1 Certification Practice Exam

Name the three main classifications of water meters.

1. Compound, Gravity, and Displacement

2. Compound, Displacement, and Velocity

3. Velocity, Displacement, and Hydrostatic

4. Compound, Electromagnetic, and Velocity

The correct answer is: Compound, Displacement, and Velocity

The three main classifications of water meters include Compound, Displacement, and Velocity. Displacement meters work by physically measuring the volume of water that passes through the meter, making them very accurate for low flow rates. This type includes positive displacement meters, which are typically used for residential applications because they can accurately measure low flows and provide reliable readings. Velocity meters measure the speed of the water flowing through the pipe and calculate the flow rate based on this velocity. These meters are particularly useful in larger pipe sizes and more substantial flow conditions. They often include types like electromagnetic, turbine, and ultrasonic meters. Compound meters combine the features of both displacement and velocity meters, allowing them to measure both low and high flow levels efficiently. These are particularly valuable in scenarios where water usage varies significantly, enabling accurate measurement across different flow rates. This classification helps in selecting the appropriate meter for different applications based on flow rates and the specific requirements of the water distribution system.