Venturi meters are accurate for ______, have __________ friction loss, require ____________, and have long been used for measuring flows in _______.

• A. a wide range of flows, high friction loss, require frequent maintenance, small pipelines
• B. a narrow range of flows, moderate friction loss, require moderate maintenance, larger pipelines
• C. a specific range of flows, moderate friction loss, require low maintenance, larger pipelines
• D. a certain range of flows, low, low maintenance, larger pipelines

Answer: (D)

Venturi meters measure flow by converting some of the fluid’s pressure energy into velocity energy, giving a precise differential pressure reading tied to flow rate. They are known for low friction (pressure) loss across the meter, and they have few moving parts, so maintenance requirements are minimal. They provide reliable accuracy over a defined range of flow rates, which makes them ideal for large-diameter pipelines where a small pressure drop matters and flow conditions stay within that usable range. That combination—accurate within a specific flow range, low friction loss, low maintenance, and suitability for larger pipelines—matches the statement you’re testing for. The other descriptions imply higher friction, more maintenance, or use in small pipes, which doesn’t align with how Venturi meters behave.