Which of the following transducers exhibits a negative temperature coefficient of resistance?

Which of the following best describes an active transducer?

If a parallel-plate capacitive transducer operates by varying the distance (x) between its plates, what is the mathematical relationship between the capacitance (C) and the displacement (x)?

Read the following statements regarding a piezoelectric transducer and select the correct option. A. The use of a piezoelectric transducer element is confined primarily to dynamic measurement. B. Piezoelectric material, when used in an underwater detection system, is utilized in sonar.