What kind of transducer varies pressure and voltage?

• A. Diode
• B. Binary
• C. Ultrasonic
• D. I/P

Answer: (D)

This question hinges on how a transducer can convert an electrical control signal into a pneumatic pressure signal. An I/P transducer takes an electrical input signal (voltage or current) and generates a proportional pneumatic pressure output. As the electrical input changes, the transducer adjusts its internal diaphragm/valve to vary the output pressure accordingly. That direct link between an electrical signal and a pressure output is why this type of transducer is the one that varies both pressure and the electrical input signal.

Other options don’t serve this function: a diode is a semiconductor device for directing current flow, not controlling pressure; binary refers to a digital state rather than a transducer; ultrasonic transducers deal with generating or sensing sound waves, not producing a controllable pneumatic pressure.