Which gauge is designed to provide a digital display and electronic signal rather than a purely mechanical indication?

• A. Mechanical gauge
• B. Digital gauge
• C. Pressure gauge
• D. Optical gauge

Answer: (B)

This question tests the distinction between gauges that only show a mechanical indication and those that also provide a digital readout and an electrical signal. A digital gauge uses sensors and electronics to convert the measured pressure into an electrical output and displays the value on a numeric digital display. That electronic signal can be read remotely, logged, or fed into control systems, which is essential for automated monitoring and SCADA/PLC integration. In contrast, a mechanical gauge relies on a Bourdon tube and a moving needle on a dial, offering no electrical output. The term pressure gauge is too broad and could refer to either type, while an optical gauge involves light-based reading and doesn’t inherently imply a digital display with an electrical signal. So the gauge designed to provide a digital display and electronic signal is the digital gauge.