Which of the following is a mechanical measuring device?

• A. Loss of head meter
• B. Digital flow meter
• C. Pressure gauge
• D. Ultrasonic flow meter

Answer: (A)

The correct answer is the loss of head meter, as it is a mechanical device used to measure the energy loss due to friction and other factors in a fluid flowing through a pipe. This type of meter operates based on physical principles, typically involving a simple arrangement such as a manometer or a series of orifices or taps that measure pressure differences directly due to the fluid velocity changes.

A loss of head meter provides data by measuring the difference in pressure at two points in the system, revealing how much energy the fluid loses as it flows through the piping. The mechanical aspects of this device make it essential for assessing the efficiency of pumping systems, aiding in identifying blockages or issues that could affect system performance.

In contrast, the digital flow meter, pressure gauge, and ultrasonic flow meter incorporate electronic components or advanced technologies to provide measurements. While they can be highly accurate and convenient, they do not fall into the category of strictly mechanical devices, as they rely on electronic readings and calculations derived from more complex operating principles than a mechanical loss of head measurement.