# Electrical Measurements Questions and Answers – Classification of Transducers

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Transducers”.

1. Active transducers are classified into ____________
a) 4 types
b) 2 types
c) 6 types
d) 8 types

Explanation: Active transducers can be subdivided into four types. They are as follows:
• Photovoltaic
• Thermoelectric
• Piezoelectric
• Electromagnetic.

2. Active transducers develops ______________
a) mechanical parameter
b) electrical parameter
c) chemical parameter
d) physical parameter

Explanation: Active transducers are also known as self generating type of transducers. They develop an electrical voltage or current proportional to the quantity being measured.

3. How do passive transducers develop electrical signals?
a) using a transformer
b) using internal source
c) using external source
d) using a diode

Explanation: Passive transducers develop electrical signals by means of an external source. They are usually known as externally power driven sources.

4. Capacitive transduction involves ___________
a) change in resistance
b) change in inductance
c) change in resistance
d) change in capacitance

Explanation: In capacitive transduction, measurand involves the change in the capacitance. Capacitance changes when the distance between the plates is varied or by a change in the dielectric.

5. In electromagnetic based transduction measurand is ___________
a) converted into mechanical force
b) converted into electromotive force
c) converted into chemical force
d) converted into physical force

Explanation: Electromagnetic transduction involves the conversion of the measurand into electromotive force. Magnetic flux is produced as a result of the relative motion between the magnet and an electromagnet.

6. Inductive transduction involves ___________
a) change in self inductance
b) change in capacitance
c) change in mutual inductance
d) change in resistance

Explanation: In an inductive transduction based system, measurand involves change in the self inductance of the coil.

7. Photovoltaic transduction involves ___________
a) voltage generation heat
b) voltage generation through sound
c) voltage generation through light
d) voltage generation current

Explanation: In a photovoltaic transduction based system, measurand is converted into voltage when the junction between dissimilar elements is illuminated.

8. Analog transducers convert input into ___________
a) voltage
b) current
c) digital
d) analog

Explanation: The analog transducers convert input into analog signal. The output is a continuous function of time. Strain gauge, LVDT, thermistor etc are analog transducers as they produce outputs which are a continuous function of time.

9. Inverse transducer converts electrical into a physical quantity.
a) True
b) False

Explanation: An inverse transducer is used to convert an electrical quantity into a physical quantity. For example, loudspeaker converts electrical signal into sound signal.

10. Digital transducers produce analog output.
a) True
b) False

Explanation: Digital transducers produce digital output in response to an input signal. A unique code is generated for each discrete value sensed.

Sanfoundry Global Education & Learning Series – Electrical Measurements.

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