What type of meter has no moving parts?

A Venturi Meter is designed to measure fluid flow by utilizing the principle of fluid dynamics and pressure change as fluid flows through a constricted section of pipe. However, it does have elements that can be considered as having no moving parts in the measurement process, as the flow rate is calculated based on changes in pressure and area rather than any mechanical movement.

The correct choice, which is not identified here, would be the Magnetic Flow Meter or the Electromagnetic Flow Meter. Both of these types of meters operate using electromagnetic principles to measure the velocity of conductive fluids, and they achieve this without any moving components. This means they are not subject to wear and tear like traditional mechanical meters, which makes them highly durable and suitable for various applications, particularly in wastewater treatment or when measuring corrosive liquids.

Thus, while the Venturi Meter does function without moving parts in terms of fluid measurement, the meters that fully align with the definition of having no moving components in their operation would be the Magnetic Flow Meter and the Electromagnetic Flow Meter.