Piezoelectric Transducer Question & AnswersSeptember 13, 2021 By Wat Electrical Leave a Comment This article lists 100+ Piezoelectric Transducer MCQs for engineering students. All the Piezoelectric Transducer Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on Piezoelectric Transducer.A piezoelectric transducer or a piezoelectric sensor is one kind of device that measures different changes within the pressure, acceleration, temperature, force, or strain by using the piezoelectric effect to change the energy into an electrical charge. The term “piezoelectric” is nothing but the electricity that can be generated through pressure. The best example of the natural piezoelectric crystal is the Quartz whereas phosphate, ammonium dehydration, Rochelle salts, lithium sulfate are the man-made type crystals.The applications of piezoelectric transducers mainly include microphones, medical diagnostics. Infertility treatment, inkjet printers, and many more.1). The property of materials in which the application of mechanical stress generates electricity is called------------ Static electricity Piezoelectricity Conductivity Both b and c HintThe mechanical stress is generated in Piezoelectricity2). Piezoelectric materials are----- Naturally available Artificially manufactured Both a and b None of the above HintPiezoelectric materials are available naturally3). Naturally available piezoelectric among the below Quartz Rubber Hair All of the above HintNaturally available piezoelectric materials are Quartz, rubber, etc4). Artificially manufactured piezoelectric among the below is Enamel Lithium niobate Wood None of these HintArtificial piezoelectric material is Lithium niobate5). Piezoelectric materials used as transducers should have----- Low output values Sensitive to temperature Frequency instability None of these HintThey don t have any properties6). The faces of piezoelectric materials are coated with-------while using as transducers Aluminium Silver Gold Silicon HintPiezoelectric materials are covered with Au7). In piezoelectric transducer, the polarity of produced charge depends upon---- The direction of applied stress Piezoelectric material property Transducer orientation All of the above HintThe polarity mainly depends on the direction of charge8). On piezoelectric material, stress is applied as Compressive stress Tensile stress Both a and b None of the above HintCompressive and tensile stresses are applied.9). The orientation of crystal effects the--- The direction of charge generated Amount of charge generated Both a and b None of these HintThe crystal orientation effects the charge10). The amount of charge generated in the longitudinal arrangement of a crystal is --------the amount generated in the transverse arrangement Larger than Smaller than Equal to Reciprocal HintThe charge generated in the longitudinal arrangement of a crystal is smaller11). Ultrasonic piezoelectric transducer works on the principle of Piezoelectric effect Converse piezoelectric effect Static electricity Photoelectric effect HintUltrasonic piezoelectric transducer works on reverse piezoelectric effect12). In converse piezoelectric effect--------is produced when----------is applied. Stress, electricity Electricity, stress Light, stress Stress, sound HintThe output of converse piezoelectric effect is stress13). In ultrasonic piezoelectric transducer, resonance occurs when the frequency of an oscillator is equal to the natural frequency of---------- Quartz Transformer Amplifier All of these HintIt is one kind of piezoelectric material14). Piezoelectric materials cannot measure Stress Dynamic frequency Static values All of these HintPiezoelectric materials cannot measure stable values15). To measure force, stress, vibrations ------is used Voltmeter Seismograph Strain gauge All of these HintIt is one kind of electric sensor16). Piezoelectric transducers are------ transducers Active transducers Passive transducers Electrical transducers None of these HintAn alternate name is active transducer17). There are -------- natural piezoelectric crystal classes 32 20 23 30 HintNaturally available piezoelectric crystal classes are twenty18). Synthetic piezoelectric materials are---------- Ceramics Polymers Organic Quartz All of these HintSynthetic piezoelectric materials are ceramics, polymers, quartz.19). Quartz ‘s mechanical quality factor is = 10^5 < 10^5 > 10^5 None of these HintThe quality factor of Quartz is above 10000020). The AT-cut quartz is used in Computers TV VCR All of these HintAT-cut quartz is used in electronics display devices21). The piezoelectric with high electromechanical coupling Quartz Barium Titanate Lithium niobate Topaz Hintpiezoelectric with high electromechanical coupling is LiNbO322). Piezoelectric material used for Langevin vibrators is Lithium niobate Barium Titanate Lithium tantalate PZT HintThe chemical formula of this material is BTO23). PZT-5 is formed by doping PZT with Donor ions Acceptor ions Nitrogen All of these HintThe PZT-5 can be formed with donar ions24). For ultrasonic measuring the piezoelectric used is PZT Barium Titanate Lead Titanate Topaz HintLead Titanate is used for ultrasonic measuring25). Frequently used piezoelectric as actuators are Piezoelectric ceramics Piezoelectric polymers Piezoelectric thin wires All of these HintPiezoelectric polymers are used as actuatorsPiezoelectric Transducer Interview Questions & Answers26). Mostly opted piezoelectric for microphones are Piezoelectric Ceramics Piezoelectric polymers Piezoelectric composites Piezoelectric wires HintPiezoelectric polymers are used for microphones27). Piezoelectric used for underwater sonar are Piezoelectric Ceramics Piezoelectric polymers Piezoelectric composites Piezoelectric wires HintPiezoelectric composites are used for underwater sonar28). Piezoelectric strain constant d for given stress x and electric field E is d = E/x d = E. x d = x/E d = E + x HintIt is the ratio of E & x29). Piezoelectric voltage constant g defines the relation between Internal stress and magnetic field External stress and applied electric field External stress and induced electric field Internal stress and induced electric field HintRatio of External stress & induced electric field30). The piezoelectric parameter that characterizes the sharpness of the electromechanical resonance system Voltage constant Electromechanical coupling factor Mechanical quality factor None of these HintMechanical quality factor is one kind of piezoelectric parameter31). The acoustic impedance is given by Z^2 = (Pressure )/(Volume velocity) Z^2 = Pressure. volume velocity Z^2 = (pressure)2( volume velocity) Z^2 = ((Pressure)x^2 )/(Volume velocity) HintIt is the ratio of pressure and volume velocity32). Polymers have----------- piezoelectric constant compared to ceramics High Low Reciprocal Both b and c HintAs compared to ceramics it has less piezoelectric constant 33). Piezoelectric materials are also related to Ferroelectric materials Ferromagnetic materials Electrostatic materials Both a and b HintAn alternate name is Ferroelectric material34). Multimorph contains Two transducers One transducer Only three transducers More than two transducers HintMultimorph includes minimum two transducers35). For off-resonance frequency application, piezoelectric should have High dielectric loss Low dielectric loss High voltage constant Low voltage constant HintPiezoelectric should include less dielectric loss36). Which of the following type transducer is used for measuring changes within pressure, temperature, acceleration & strain? Piezoelectric transducer Oscillator transducer Inductive transducer Flow transducer HintPiezoelectric sensor is used to measure different changes37). Piezoelectric crystals are __________ Liquefies within water Drift on water They are not dissolving within water Soak up water HintThese crystals liquefy within water and it is completely soluble within water. 38). Piezoelectric crystals generate _________ Very less voltage High voltage less voltage Extremely high voltage HintPiezoelectric crystals generate maximum voltage at less current.39). Piezoelectric transducer mainly includes… Quartz crystal Aluminum wire Copper wire Aluminum rod Hint: One kind of crystal is used in piezoelectric transducer40). In a piezoelectric transducer, once a compressive power is given to a quartz crystal then what will happen? No charge carriers will be induced Positive charge carriers will be induced Negative charge carriers will be induced Both the charge carriers will be induced HintAt one face of the crystal in transducer will be induced with positive charge carriers41). The term piezoelectric means? The electricity generates once pressure is applied Electrical signal can be changed Conversion of different quantities Calculation of DC o/p Impedance HintOnce pressure is applied then current will be generated42). Which of the following material does not contain the property of piezoelectric? Ceramic material Piezoelectric material Solid material Polymers HintThe materials like glassy, crystalline, etc.43). The ceramic material operates at which temperature? Above 3000ºC Below 3000ºC Equal to 1000ºC Ranges from 1000ºC to 1500ºC HintThe ceramic material operates at 3000ºC to 4000ºC44). The charge polarity in transducer mainly depends on … Based on sensitivity of charge The direction of applied pressure Crystals thickenss Electrode charges HintIt depends on the way of applied force45). What is the function of a transducer? Conversion of voltage Conversion of power Conversion of energy Power conversion HintTransducer is used to convert one form of energy to other form46). Which of the following is the example of a transducer? Digital camera Meter Microphone Micro SD card HintThe device converts from sound to an electrical signal.47). The sensitivity of a piezoelectric transducer is _________ Less Extremely high High Nothing HintA piezoelectric transducer includes high sensitivity48). In which of the following kitchen application, a piezoelectric crystal is used Grinding Gas stove lighting Micro oven Mixing HintA piezoelectric crystal is used in kitchen application to lighten the stove.49). What is the sensitivity of a piezoelectric transducer? 20 mV/kPa 05 mV/kPa 30 mV/kPa 40 mV/kPa HintThe sensitivity is ranges from 25 to 35 mV/kPa 50). What kind of energy conversion can be done by a piezoelectric transducer? Mechanical to sound Sound to mechanical Electrical to mechanical Mechanical to electrical HintIt converts mechanical to electrical energy.Piezoelectric Transducer Questions and Answers51). What is the working principle of piezoelectric transducer? Energy conversion Piezoelectricity Electromagnetic induction Detect the energy HintThe electric current that build ups within a certain solid materials52). The sensing element used in piezoelectric transducer is Diodes Quartz crystal Dielectric Plastic HintThe sensing element used in this transducer is rock crystal53). The frequency response of piezoelectric transducer is.. Low High Medium Infinite HintThis transducer has maximum frequency response54). The transient response of piezoelectric transducer is.. High Low Medium None of the Above HintThis transducer has maximum transient response55). The o/p attained by the piezoelectric transducers is Low Extremely low High Very high HintThe output of this transducer is very less56). In some cases, the output may effected by the ….. External force Temperature Surroundings Temperature and humidity HintThe output of the piezoelectric transducer may effected by the clamminess & hotness57). The impedance of piezeoelectric transducer is High Low Medium Infinite HintThe piezoelectric transducer has maximunm impedance.58). Which of the following cannot measured by the piezoelectric transducer? Static force/pressure Temperature Distance None of the above HintIt cannot measure the fixed force59). If a fixed force is given to a piezoelectric transducer, then the output will be? High Zero Low None of the above HintThe output of this transducer is nothing.60). For dynamic measurement, which of the following transducer is used? Capacitive transducer Inductive transducer Piezoelectric Transducer Flow transducer HintA type of electroacoustic transducer61). In which of the following application, piezoelectric transducer is used? Crystal Oscillator Operational amplifier Heartley oscillator Integrated circuits HintIt is used in electronic oscillator 62). Which of the following transducer is known as an active transducer? LVDT Capacitive microphone RVDT Piezoelectric transducer HintPiezoelectric sensor is called as an active transducer63). Which of the following substance produces the voltage once they are mechanically forced through specific planes. Thermo-electric Piezoelectric Radio-active Photo-electric HintThe substance used to convert the energy from mechanical to electrical64). In electrostatic dust filters & spark ignition engines, what is the main function of piezoelectric transducer? Provides high electric power Provides low electric power Provides high voltage and less current Provides less current HintThis transducer is used to provide less current & maximum voltage65). A Piezo-electric crystal simply melts in ________ Less temperature circum-ambient because of low solubility of water Maximum temperature circum-ambient Least temperature circum-ambient Maximum temperature circum-ambient because of high solubility of water HintA Piezo-electric crystal simply melts in maximum temperature.66). When a piezoelectric crystal generates an emf? When there is no mechanical power Once exterior mechanical power is applied toward ‘I’ Low temperature circum-ambient Highest temperature circum-ambient due to high water solubility HintOnce external force is given, then it generates an emf67). When Piezoelectric transducers starts working? When heat is applied to it When vibrations are applied to it When mechanical force is given to it When illuminations are provided to it HintThe working of this transducer mainly depends on temperature68). Which of the following transducers are inverse transducers? Capacitive transducer Inductive transducer Piezoelectric transducer Flow transducer HintPiezoelectric sensor is an inverse transducer69). Rochelle salt & quartz materials come under the group of? Synthetic group Natural group Fiber group Fiber/Synthetic HintOne of the natural group materials is quartz 70).Once mechanical energy is applied across the piezoelectric material then it generates….? Electrostatic charge Electromagnetic force Voltage Signals HintPiezoelectric materials generate electrostatic energy71). Which of the subsequent substance is piezo electric? Cadmium and sulphate Barium titanate Lead Zirconate Lead titanate HintCeramics are Piezo electric substances 72). A piezo electric crystal is used to measure…..? Sound Resistance Force Velocity HintA piezo electric crystal measures power73). Piezo-electric transducer is used to measure? c = ∈⁄d*a c = a*d c = a∈⁄d c = a/d HintThe c = a∈⁄d can be measured using this transducer74). Which of the following transducer is self generating? Quartz crystal Capacitive Pressure Temperature HintIt is one kind of power stone.75). Piezoelectric crystals generate_________. Powe Less current Maximum voltage Extremely high voltage HintPiezoelectric crystals are used in electrostatic dust filters & spark-ignition engines for generating maximum voltage.Piezoelectric Transducer MCQs for Exams76). In which year piezoelectric effect was discovered? 1882 .1801 1880 1839 HintPiezoelectric effect was discovered in between 1875 to 189077). Who invented the piezoelectric effect? Pierre & Jacques Curie James Zhong Walter HintPiezoelectric effect was discovered by curie brothers Please refer to this link to know more about Piezoelectric Effect 78). The size of piezoelectric transducer is… Large Small Medium Nano HintThe size of piezoelectric transducer is tiny79. The frequency response of piezoelectric transducer is… High Low Very High Very low HintThe piezoelectric transducer has maximum frequency response80. The transient response of piezoelectric transducer is… Low High Very low Very high HintThe piezoelectric transducer has maximum transient response81). In which of the following transducer, providing the desired shape to the crystal material with ample strength is difficult? Capacitive Inductive Piezoelectric Flow HintIn piezoelectric transducer, providing the required shape to the crystal type material is not easy.82). In which of the following transducer needs an external circuit to provide high output Flow Piezoelectric Inductive Capacitive HintPiezoelectric transducer uses external circuit to provide maximum output83). For dynamic measurement, which transducer is used? Temperature Pressure Displacement Piezoelectric HintThe piezoelectric transducer is used where the parameters changes at the quick rate84). which of the following sensor is used along with a Piezo transducer/sensor to measure stress, force, vibrations. Strain gauges Radiation Sensor Position Sensor Proximity Sensor HintBy using this sensor strain on object can be measured.85). What is the role of piezoelectric transducer in automotive companies? To check the battery status To notice detonation within the blocks of engine To check the breakers To check the alternator HintThis transducer is used to notice ignition within automobiles86). What is the function of Piezoelectric transducers in industrial processing devices? To monitor the power To control different loads To discover faults To reduce faults HintThe power can be monitored in industries by this transducer87). At which temperature, synthetic crystal & Rochelle salt cannot be utilized? > 115 degree F < 115 degree F = 110 degree F 98 degree F HintThe synthetic crystal & Rochelle salt is used > 115 degree F.88). As compared to natural crystals, synthetic crystals are …? Responsive More responsive Less response None HintSynthetic crystals give quick response & gives max output 89). The voltage which is generated by a piezoelectric transducer can be measured simply by using… Voltage measuring instruments Tachometer Nanometer Digital meter HintVoltmeter is used to measure the voltage generated by a transducer.90). Which of the following stress is used in piezoelectric transducer? Compressive Mechanical Physical Psychological HintBoth the tensile & Compressive stresses are used in piezoelectric transducer.91). Which of the following word is used to derive the term piezoelectric…… Piezen Piezo Pigeon Piezoglypt HintThe term piezoelectric is derived from Greek word.92). Which of the following characteristic is unique for piezoelectric effect …… It is reversible Increased Decreased Distinctive HintOnce voltage is applied to the transducer, then they change the dimension through certain plane93). When electric field is applied to the quartz crystal then what will happen? It becomes longer Shorter No change None of the above HintWhen quartz crystal is in electric field then it becomes into longer94). When electric field is applied in reverse direction to the quartz crystal then what will happen? It becomes shorter Longer No change It will damage HintWhen an electric field is given in reverse direction then quartz crystal will become into longer95). Which of the following condition is not suitable to measure? Variable condition Static condition Dynamic condition None of the above HintStatic condition is not appropriate to measure96). Piezoelectric transducer is effected by….. Voltage Curent Resistance Temperature HintPiezoelectric transducer will effect by temperature97). Piezoelectric transducer is used in seismographs for measuring…? Vibrations within Rockets To check the power in Rockets Temperature in rockets Condition of rockets HintThese transducers are used for measuring vibrations within rockets.98). Which of the following modes are used in piezoelectric sensors? Voltage & charge modes Current mode Temperature mode Resistance mode HintBoth the modes like charge and voltage are used in these sensors.99). A device that is used to change the energy from one form to other is called as? Converter Transducer Diode Oscillator HintA sensor or transducer converts the energy from one form to other100). What is the mathematical expression of piezo electric transducer? Vo = gtP Vo = gt/P Vo = g(t/P) Vo = g(P/t) HintThe expression for piezo electric transducer is Vo = g*t*P101). The voltage range produced by a piezo disc is? From 10 to 20V From 13 to 39V From 5 to 15V From 15 to 25V HintThe minimum voltage generated by a piezo disc is 13V Time's up
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