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Capacitive Transducer Question and Answers

June 28, 2022 By WatElectronics

This article lists 50 Capacitive Transducer MCQs for engineering students. All the Capacitive Transducer Questions & Answers below include a hint and a link to the relevant topic wherever possible. This is helpful for users preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Capacitive Transducer. 

Transducers are known for converting one form of energy to another i.e., Non-electrical to electrical. Based on the transduction, these are classified as Resistive, Capacitive, Inductive, Current, and Voltage generating transducers.

A capacitor with varying capacitance is referred to as a capacitive transducer. It operates through the external supply provided and is categorized under a passive one. The principle behind the functioning of the capacitive transducer is varying capacitance.

Generally, a capacitor consists of two plates made of metal connected similarly. These plates are separated via dielectric among them. Dielectrics used among them can be liquid, material, or gas.

Advantages of Capacitive Transducers include: The amount of power required by these transducers is low, and a capacitive transducer has a high impedance at the input which leads to reducing the loading effect making the integration with the ICs easy. It has a good frequency response.

Disadvantages of Capacitive Transducers are: The parts used in transducers are made of metal and require insulation. These types of transducers are sensitive to noise. Earthing is needed in such transducers to reduce the ‘stray magnetic field’ effect.

Capacitive transducers are capable of measuring large displacements ranging from 1 millimeter up to certain centimeters. One plate is fixed and the other is left for movement in these transducers. It is known for measuring both linear and angular displacements based on the variation of capacitance.

1). Transducer based on capacitor as the transduction element is _______?

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2). What is the formula to calculate capacitance?

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3). What is the difference among normal capacitor and a Capacitive transducer?

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4). How many plates does a capacitive transducer have?

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5). How the plates in capacitive transducer are connected?

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6). What is the principle involved in capacitive transducers?

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7). The ε in the capacitance formula stands for _______?.

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8). How does the capacitance gets varied in capacitive transducers?

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9). How the capacitance is measured in capacitive transducers?

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10). Sensitivity in capacitive transducers is ______?

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11). Capacitive transducer is a _________?

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12). Capacitive transducers are sensitive to _________?

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13). How to calculate sensitivity in capacitive transducer?

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14). What is the formula to calculate charge sensitivity?

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15). Capacitive transducers with voltage sensitivity of quartz are 50*10^-3 Vm/N and Barium titanate is 10*10^-3 Vm/N. The permittivity of those sensitivities is 40* 10^-12F/m and 16*10^-9 F/m. Find out their sensitivities of charge?

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16). How the impedance at output of the transducer is calculated?

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17). What is the formula to calculate the capacitance of Parallel plates?

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18). What is the relation among displacement and capacitance?

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19). How to calculate the maximum capacitance for angular movements in transducers?

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20). The capacitance in Parallel plates will be maximum at _______?

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Capacitive Transducer MCQs for Exams

21). At what angle the capacitance will be maximum?

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22). What happens to the sensitivity when the capacitance vary due to distance amid plates?

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23). The transducer accuracy depends upon _____?

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24). Why do Capacitive transducers behave non-linearly?

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25). Impedance at output is dependent upon _______?.

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26). Capacitive transducers are ___________?

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27). Capacitive transducers are used in ______ measurements?

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28). Capacitive transducer is a _________ transducer?

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29). How the liquid levels are measured using Capacitive transducers?

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30). A capacitive transducer using quartz plates of 700 square millimeters area separated with 3 mm distance. 360 pF is one of the capacitance. When the pressure applied is 900kN/m^2, deflection of about 0.8mm. What will be the capacitance at this pressure?

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Hint

Capacitive Transducer Quiz Questions and Answers

31). Dynamic characteristics of Capacitive transducers resembles to _______?

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32). Capacitance can be increased by ________?

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33). What quantities can be measured using Capacitive transducers?

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34). How the dielectric constant affects the capacitance?

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35). How angular displacement effects the capacitance in capacitive transducers?

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36). What are the advantages of Capacitive transducers?

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37). Why the loading effect is less in capacitive transducers?

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38). Capacitive transducers are __________?

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39). In what way the measurement of smaller value of capacitance affects the transducer?

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40). What type of displacement is calculated using Capacitive transducer?

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Capacitive Transducer Interview Questions and Answers

41). Capacitive transducer operates in _____ modes?

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42). Displacement is _________ proportional to capacitance?

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43). Area of overlapping and the capacitance are in _____ proportion.

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44). Capacitive transducers are known for measuring ______?

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45). What are the uses of capacitive transducer?

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46). Angular and Linear displacements are measured using _____ transducers?

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47). What types of transducers are used in Aeroplane altimeters?

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48). What type of transducers is known for the measurement of gas humidity?

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49). Pressure and Force are measured using ____ transducers?

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50). What type of changes are measured using capacitive transducers?

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Read more about Capacitive Transducers

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