Which pair lists two common types of flow meters?

• A. Spring Probe and Paddlewheel
• B. Post Indicator and Gallons Per Minute
• C. Stem and Yoke
• D. Pressure Governors and Electronic Pump Controller

Answer: (A)

Measuring how fast water moves through the pump discharge is the idea here, and two common types you’ll see are paddlewheel and spring-probe flow meters. A paddlewheel flow meter places a small wheel in the flow path; as water pushes the wheel, it spins, and that rotation is translated into a gallons per minute reading. A spring-probe flow meter uses a spring-loaded probe inserted into the stream; the probe’s deflection or resistance changes with flow, providing a reading on the panel. These two forms are widely used because they are simple, robust, and practical for in-pump use, which is why they’re paired as typical flow meters. The other options involve valves, indicators, or control devices rather than flow measurement: post indicator valves pertain to valve status, “GPM” is a unit, stem and yoke are valve components, and pressure governors with an electronic pump controller deal with regulating pressure or automating pumping rather than measuring flow.