This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Types of Transducers”.
1. Which of the following is not a characteristic of an ideal transducer?
a) High dynamic range
b) Low linearity
c) High repeatability
d) Low noise
View Answer
Explanation: An ideal transducer should show high linearity. A linear system should produce exact output according to input.
2. A transducer converting ground movement or velocity to voltage is known as ________________
a) Geophone
b) Pickup
c) Hydrophone
d) Sonar transponder
View Answer
Explanation: Geophone is a device used to convert ground movement to voltage, which is used in Remote ground sensors (RGS) and also as a replacement for broadband seismometers.
3. Which of the following represent active transducer?
a) Strain gauge
b) Thermistor
c) LVDT
d) Thermocouple
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Explanation: Active transducers are self-generating type, they don’t require external power to work while passive transducers require external power to work.
4. Which transducer is known as ‘self-generating transducer’?
a) Active transducer
b) Passive transducer
c) Secondary transducer
d) Analog transducer
View Answer
Explanation: The name self-generating transducer is due to its property of working without the use of external power.
5. What is the relation between scale factor and sensitivity of a transducer?
a) Scale factor is double of sensitivity
b) Scale factor is inverse of sensitivity
c) Sensitivity is inverse of scale factor
d) Sensitivity is equal to scale factor
View Answer
Explanation: Sensitivity is an important property of transducer. Every transducer should be sufficiently sensitive to provide some output that can be detected.
6. Which of the following is an analog transducer?
a) Encoders
b) Strain gauge
c) Digital tachometers
d) Limit switches
View Answer
Explanation: Analog transducers convert physical quantity to analog signals while digital transducers convert physical quantity to digital signals. Strain gauge is an example of an Analog transducer.
7. What is the principle of operation of LVDT?
a) Mutual inductance
b) Self-inductance
c) Permanence
d) Reluctance
View Answer
Explanation: Linear variable differential transformer (LVDT) is a type of transformer used for measuring displacement, and it has the same principle of operation of transformer.
8. Which of the following can be measured using Piezo-electric transducer?
a) Velocity
b) Displacement
c) Force
d) Sound
View Answer
Explanation: Piezo-electric crystals produces an electric signal when pressure applied. Examples are quartz, Rochelle salt. That is, it converts force into electric signals.
9. Capacitive transducer is used for?
a) Static measurement
b) Dynamic measurement
c) Transient measurement
d) Both static and dynamic
View Answer
Explanation: Capacitive transducers convert measurant into changes in capacitance. Change in capacitance is caused by change in dielectric or change in distance between plates.
10. Which of the following is used in photo conductive cell?
a) Selenium
b) Quartz
c) Rochelle salt
d) Lithium sulphate
View Answer
Explanation: Photo conductive action is the property of reduction of resistance when exposed to light. Selenium shows photoconductive action.
Sanfoundry Global Education & Learning Series – Instrumentation Transducers.
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