Which of the following measuring detectors applies a converging cone shaped inlet section?

The venturi tube utilizes a converging cone-shaped inlet section to measure the flow rate of fluids. This design works based on the principle of conservation of energy and Bernoulli's equation. As the fluid enters the venturi tube, it is forced to flow into a narrower section, causing the velocity of the fluid to increase while the pressure decreases. By measuring the pressure difference between the wider and narrower sections of the tube, one can determine the flow rate. This shape is crucial because it helps in reducing turbulence as the fluid accelerates, leading to more accurate measurements.

The other devices mentioned, while they are also used for flow measurements, do not feature a converging cone-shaped inlet section. The orifice plate creates a sharp drop in pressure but does not have a converging section; it simply allows flow through a hole or "orifice," causing a pressure differential that can be measured. The rotameter uses a tapered tube to measure flow but does not employ a converging cone shape; instead, it relies on a float that rises in response to flow rate. The pitot tube measures fluid velocity using static and dynamic pressure, but it does not have a converging inlet; it has an opening that captures the flow to measure pressure