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Which of the following is not a passive transducer?(a) Strain gauge(b) Ultrasonic transducer(c) IR sensor(d) Doppler effect transducerThis question was addressed to me in a job interview.The question is from Writing System topic in portion Recording System of Biomedical Instrumentation

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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