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 _______? Resistive Capacitive Inductive Current and Voltage generating transducers None Hint 2). What is the formula to calculate capacitance? C = ε A/ d C = A/ d C = ε d/ A C = ε / d None Hint 3). What is the difference among normal capacitor and a Capacitive transducer? Area Intensity Distance amid plates Both a & b None Hint 4). How many plates does a capacitive transducer have? One Two Three Four None Hint 5). How the plates in capacitive transducer are connected? Both are fixed One is fixed and other is movable Both are movable As per requirement None Hint 6). What is the principle involved in capacitive transducers? Varying Resistance Varying current Varying capacitance Varying voltage None Hint 7). The ε in the capacitance formula stands for _______?. Permittivity of area Permittivity of dielectric Permittivity of distance Permittivity of outcome None Hint 8). How does the capacitance gets varied in capacitive transducers? By changing the overlapped plates area By changing the distance By changing dielectric or permittivity All as mentioned above None Hint 9). How the capacitance is measured in capacitive transducers? Ammeter Voltmeter Bridge circuits Thermistor None Hint 10). Sensitivity in capacitive transducers is ______? Low High Constant Unaltered None Hint 11). Capacitive transducer is a _________? Electrical Transducer Non-electrical Transducer Active transducer b & c None Hint 12). Capacitive transducers are sensitive to _________? Sensing Displacement Magnetic couple Electromagnetic waves None Hint 13). How to calculate sensitivity in capacitive transducer? δc/d δc/A δc/δd δc/ε None Hint 14). What is the formula to calculate charge sensitivity? Voltage sensitivity * permittivity Voltage sensitivity* Area Voltage sensitivity* Distance Voltage sensitivity* Current sensitivity None Hint 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? 156 Pc/N 2 Pc/N 160 Pc/N 4 Pc/N 176 Pc/N 3 Pc/N 160 Pc/N 2 Pc/N None Hint 16). How the impedance at output of the transducer is calculated? Xc = 1/2πfC Xc = 1/2πC Xc = 1/2πf Xc = 1/2πf1f2 None Hint 17). What is the formula to calculate the capacitance of Parallel plates? C = ε A/ d C = ε l*w/ d C = ε l/ d a & b None Hint 18). What is the relation among displacement and capacitance? Linear Non-linear Parallel Parabolic None Hint 19). How to calculate the maximum capacitance for angular movements in transducers? Cmax = πεr^2/ 2d Cmax = πεr^2/ d Cmax = πεr/ 2d Cmax = εr^2/ 2d None Hint 20). The capacitance in Parallel plates will be maximum at _______? Overlapped region Large distance amid plates 180 degrees a & c None Hint Capacitive Transducer MCQs for Exams 21). At what angle the capacitance will be maximum? Zero 90 180 270 None Hint 22). What happens to the sensitivity when the capacitance vary due to distance amid plates? Vary Constant Doesn’t alter Can’t determine None Hint 23). The transducer accuracy depends upon _____? Variation of temperature Variation of pressure Variation of force Variation of acceleration None Hint 24). Why do Capacitive transducers behave non-linearly? Stray Electric fields Magnetic fields Electromagnetic fields None None Hint 25). Impedance at output is dependent upon _______?. Frequency used Temperature Pressure Intensity None Hint 26). Capacitive transducers are ___________? Temperature sensitive Area sensitive Dielectric sensitive All as mentioned above None Hint 27). Capacitive transducers are used in ______ measurements? Strain gauges Tachometers Pressure a, b & c None Hint 28). Capacitive transducer is a _________ transducer? Non-loading Non-contact Non-invasive All as mentioned above None Hint 29). How the liquid levels are measured using Capacitive transducers? Overlapped area Distance amid plates Plates shape Strength of dielectric None Hint 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? Add description here! 600pF 501pF 800pF 491pF None Hint Capacitive Transducer Quiz Questions and Answers 31). Dynamic characteristics of Capacitive transducers resembles to _______? Low pass filters High pass filters Band-stop filters Notch filters None Hint 32). Capacitance can be increased by ________? Increase in the distance among the plates Decrease in overlapped area Decrease in the distance amid plates All as mentioned above None Hint 33). What quantities can be measured using Capacitive transducers? Force Displacement Speed All mentioned above None Hint 34). How the dielectric constant affects the capacitance? Directly Indirectly Doesn’t change Constant None Hint 35). How angular displacement effects the capacitance in capacitive transducers? Direct proportion Indirect proportion Doesn’t change Changes inadequately None Hint 36). What are the advantages of Capacitive transducers? Loading effect is less Low power required Higher frequency response All as mentioned above None Hint 37). Why the loading effect is less in capacitive transducers? High input impedance Low input impedance High output impedance Low output impedance None Hint 38). Capacitive transducers are __________? Passive transducers Externally generated Active transducers a & b None Hint 39). In what way the measurement of smaller value of capacitance affects the transducer? Increase in input impedance Decrease in input impedance Increase in output impedance Decrease in output impedance None Hint 40). What type of displacement is calculated using Capacitive transducer? Linear Angular Symmetric Linear and Angular None Hint Capacitive Transducer Interview Questions and Answers 41). Capacitive transducer operates in _____ modes? Contacting Non-contacting Both a & b Only contacting None Hint 42). Displacement is _________ proportional to capacitance? Directly Inversely Precisely Exactly None Hint 43). Area of overlapping and the capacitance are in _____ proportion. Direct Indirect Inverse Reverse None Hint 44). Capacitive transducers are known for measuring ______? Static Dynamic Neutral Both b and c None Hint 45). What are the uses of capacitive transducer? To measure the variation in distance among plates To measure the variation among the plates area To measure the change in dielectric All the above None Hint 46). Angular and Linear displacements are measured using _____ transducers? Resistive Capacitive Inductive Current and Voltage generating transducers None Hint 47). What types of transducers are used in Aeroplane altimeters? Resistive Capacitive Inductive Current and Voltage generating transducers None Hint 48). What type of transducers is known for the measurement of gas humidity? Resistive Capacitive Inductive Current and Voltage generating transducers None Hint 49). Pressure and Force are measured using ____ transducers? Resistive Capacitive Inductive Current and Voltage generating transducers. None Hint 50). What type of changes are measured using capacitive transducers? Static Dynamic Sensitivity Both a & b None Hint Read more about Capacitive Transducers None For More MCQs Transducer Questions & Answers None Please fill in the comment box below. Time's up
