4th Class Power Engineering Part A Practice Exam 2025 - Free Power Engineering Practice Questions and Study Guide

Engineers may prefer venturi tubes over orifice plates primarily due to the characteristic of producing less pressure drop across the flow measurement device. Venturi tubes are designed with a gradual constriction in the flow path, which allows fluid to pass through with a smoother transition. This reduces turbulence and energy loss, resulting in a lower pressure drop compared to orifice plates, which have a more abrupt change in flow area.

The reduced pressure drop is significant because it means less energy is needed to maintain flow through the system, enhancing overall system efficiency. This is particularly beneficial in applications where maintaining pressure is critical, or where energy costs need to be minimized.

While other factors such as flow capacity, installation costs, and size can be important considerations, the standout advantage related to cost efficiency often hinges on the lower pressure drop associated with venturi tubes, leading to less overall energy consumption and operational costs in fluid handling systems.