1.

Which of the following is not a passive transducer?(a) Strain gauge(b) Ultrasonic transducer(c) IR sensor(d) Doppler effect transducer

Answer» The correct option is (a) Strain gauge

Explanation: Strain gauge transducer is an active transducer. Its working principle is based on a change in resistance. Ultrasonic transducers need power to operate. So do the IR sensors and doppler effect transducers.


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