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 electricityPiezoelectricityConductivityBoth b and cHintThe mechanical stress is generated in Piezoelectricity 2). Piezoelectric materials are-----Naturally availableArtificially manufacturedBoth a and bNone of the aboveHintPiezoelectric materials are available naturally 3). Naturally available piezoelectric among the belowQuartzRubberHairAll of the aboveHintNaturally available piezoelectric materials are Quartz, rubber, etc 4). Artificially manufactured piezoelectric among the below isEnamelLithium niobateWoodNone of theseHintArtificial piezoelectric material is Lithium niobate 5). Piezoelectric materials used as transducers should have-----Low output valuesSensitive to temperatureFrequency instabilityNone of theseHintThey don t have any properties 6). The faces of piezoelectric materials are coated with-------while using as transducersAluminiumSilverGoldSiliconHintPiezoelectric materials are covered with Au 7). In piezoelectric transducer, the polarity of produced charge depends upon----The direction of applied stressPiezoelectric material propertyTransducer orientationAll of the aboveHintThe polarity mainly depends on the direction of charge 8). On piezoelectric material, stress is applied asCompressive stressTensile stressBoth a and bNone of the aboveHintCompressive and tensile stresses are applied. 9). The orientation of crystal effects the---The direction of charge generatedAmount of charge generatedBoth a and bNone of theseHintThe crystal orientation effects the charge 10). The amount of charge generated in the longitudinal arrangement of a crystal is --------the amount generated in the transverse arrangementLarger thanSmaller thanEqual toReciprocalHintThe charge generated in the longitudinal arrangement of a crystal is smaller 11). Ultrasonic piezoelectric transducer works on the principle ofPiezoelectric effectConverse piezoelectric effectStatic electricityPhotoelectric effectHintUltrasonic piezoelectric transducer works on reverse piezoelectric effect 12). In converse piezoelectric effect--------is produced when----------is applied.Stress, electricityElectricity, stressLight, stressStress, soundHintThe output of converse piezoelectric effect is stress 13). In ultrasonic piezoelectric transducer, resonance occurs when the frequency of an oscillator is equal to the natural frequency of----------QuartzTransformerAmplifierAll of theseHintIt is one kind of piezoelectric material 14). Piezoelectric materials cannot measureStressDynamic frequencyStatic valuesAll of theseHintPiezoelectric materials cannot measure stable values 15). To measure force, stress, vibrations ------is usedVoltmeterSeismographStrain gaugeAll of theseHintIt is one kind of electric sensor 16). Piezoelectric transducers are------ transducersActive transducersPassive transducersElectrical transducersNone of theseHintAn alternate name is active transducer 17). There are -------- natural piezoelectric crystal classes32202330HintNaturally available piezoelectric crystal classes are twenty 18). Synthetic piezoelectric materials are----------CeramicsPolymersOrganic QuartzAll of theseHintSynthetic piezoelectric materials are ceramics, polymers, quartz. 19). Quartz ‘s mechanical quality factor is= 10^5< 10^5> 10^5None of theseHintThe quality factor of Quartz is above 100000 20). The AT-cut quartz is used inComputersTVVCRAll of theseHintAT-cut quartz is used in electronics display devices 21). The piezoelectric with high electromechanical couplingQuartzBarium TitanateLithium niobateTopazHintpiezoelectric with high electromechanical coupling is LiNbO3 22). Piezoelectric material used for Langevin vibrators isLithium niobateBarium TitanateLithium tantalatePZTHintThe chemical formula of this material is BTO 23). PZT-5 is formed by doping PZT withDonor ionsAcceptor ionsNitrogenAll of theseHintThe PZT-5 can be formed with donar ions 24). For ultrasonic measuring the piezoelectric used isPZTBarium TitanateLead TitanateTopazHintLead Titanate is used for ultrasonic measuring 25). Frequently used piezoelectric as actuators arePiezoelectric ceramicsPiezoelectric polymersPiezoelectric thin wiresAll of theseHintPiezoelectric polymers are used as actuatorsPiezoelectric Transducer Interview Questions & Answers 26). Mostly opted piezoelectric for microphones arePiezoelectric CeramicsPiezoelectric polymersPiezoelectric compositesPiezoelectric wiresHintPiezoelectric polymers are used for microphones 27). Piezoelectric used for underwater sonar arePiezoelectric CeramicsPiezoelectric polymersPiezoelectric compositesPiezoelectric wiresHintPiezoelectric composites are used for underwater sonar 28). Piezoelectric strain constant d for given stress x and electric field E isd = E/xd = E. xd = x/Ed = E + xHintIt is the ratio of E & x 29). Piezoelectric voltage constant g defines the relation betweenInternal stress and magnetic fieldExternal stress and applied electric fieldExternal stress and induced electric fieldInternal stress and induced electric fieldHintRatio of External stress & induced electric field 30). The piezoelectric parameter that characterizes the sharpness of the electromechanical resonance systemVoltage constantElectromechanical coupling factorMechanical quality factorNone of theseHintMechanical quality factor is one kind of piezoelectric parameter 31). The acoustic impedance is given byZ^2 = (Pressure )/(Volume velocity)Z^2 = Pressure. volume velocityZ^2 = (pressure)2( volume velocity)Z^2 = ((Pressure)x^2 )/(Volume velocity)HintIt is the ratio of pressure and volume velocity 32). Polymers have----------- piezoelectric constant compared to ceramicsHighLowReciprocalBoth b and cHintAs compared to ceramics it has less piezoelectric constant 33). Piezoelectric materials are also related toFerroelectric materialsFerromagnetic materialsElectrostatic materialsBoth a and bHintAn alternate name is Ferroelectric material 34). Multimorph containsTwo transducersOne transducerOnly three transducersMore than two transducersHintMultimorph includes minimum two transducers 35). For off-resonance frequency application, piezoelectric should haveHigh dielectric lossLow dielectric lossHigh voltage constantLow voltage constantHintPiezoelectric should include less dielectric loss 36). Which of the following type transducer is used for measuring changes within pressure, temperature, acceleration & strain?Piezoelectric transducerOscillator transducerInductive transducerFlow transducerHintPiezoelectric sensor is used to measure different changes 37). Piezoelectric crystals are __________Liquefies within waterDrift on waterThey are not dissolving within waterSoak up waterHintThese crystals liquefy within water and it is completely soluble within water. 38). Piezoelectric crystals generate _________Very less voltageHigh voltageless voltageExtremely high voltageHintPiezoelectric crystals generate maximum voltage at less current. 39). Piezoelectric transducer mainly includes…Quartz crystalAluminum wireCopper wireAluminum rodHint: One kind of crystal is used in piezoelectric transducer 40). In a piezoelectric transducer, once a compressive power is given to a quartz crystal then what will happen?No charge carriers will be inducedPositive charge carriers will be inducedNegative charge carriers will be inducedBoth the charge carriers will be inducedHintAt one face of the crystal in transducer will be induced with positive charge carriers 41). The term piezoelectric means?The electricity generates once pressure is appliedElectrical signal can be changedConversion of different quantitiesCalculation of DC o/p ImpedanceHintOnce pressure is applied then current will be generated 42). Which of the following material does not contain the property of piezoelectric?Ceramic materialPiezoelectric materialSolid materialPolymersHintThe materials like glassy, crystalline, etc. 43). The ceramic material operates at which temperature?Above 3000ºCBelow 3000ºCEqual to 1000ºCRanges from 1000ºC to 1500ºCHintThe ceramic material operates at 3000ºC to 4000ºC 44). The charge polarity in transducer mainly depends on …Based on sensitivity of chargeThe direction of applied pressureCrystals thickenssElectrode chargesHintIt depends on the way of applied force 45). What is the function of a transducer?Conversion of voltageConversion of powerConversion of energyPower conversionHintTransducer is used to convert one form of energy to other form 46). Which of the following is the example of a transducer?Digital cameraMeterMicrophoneMicro SD cardHintThe device converts from sound to an electrical signal. 47). The sensitivity of a piezoelectric transducer is _________LessExtremely highHighNothingHintA piezoelectric transducer includes high sensitivity 48). In which of the following kitchen application, a piezoelectric crystal is usedGrindingGas stove lightingMicro ovenMixingHintA piezoelectric crystal is used in kitchen application to lighten the stove. 49). What is the sensitivity of a piezoelectric transducer?20 mV/kPa05 mV/kPa30 mV/kPa40 mV/kPaHintThe sensitivity is ranges from 25 to 35 mV/kPa 50). What kind of energy conversion can be done by a piezoelectric transducer?Mechanical to soundSound to mechanicalElectrical to mechanicalMechanical to electricalHintIt converts mechanical to electrical energy.Piezoelectric Transducer Questions and Answers 51). What is the working principle of piezoelectric transducer?Energy conversionPiezoelectricityElectromagnetic inductionDetect the energyHintThe electric current that build ups within a certain solid materials 52). The sensing element used in piezoelectric transducer isDiodesQuartz crystalDielectricPlasticHintThe sensing element used in this transducer is rock crystal 53). The frequency response of piezoelectric transducer is..LowHighMediumInfiniteHintThis transducer has maximum frequency response 54). The transient response of piezoelectric transducer is..HighLowMediumNone of the AboveHintThis transducer has maximum transient response 55). The o/p attained by the piezoelectric transducers isLowExtremely lowHighVery highHintThe output of this transducer is very less 56). In some cases, the output may effected by the …..External forceTemperatureSurroundingsTemperature and humidityHintThe output of the piezoelectric transducer may effected by the clamminess & hotness 57). The impedance of piezeoelectric transducer isHighLowMediumInfiniteHintThe piezoelectric transducer has maximunm impedance. 58). Which of the following cannot measured by the piezoelectric transducer?Static force/pressureTemperatureDistanceNone of the aboveHintIt cannot measure the fixed force 59). If a fixed force is given to a piezoelectric transducer, then the output will be?HighZeroLowNone of the aboveHintThe output of this transducer is nothing. 60). For dynamic measurement, which of the following transducer is used?Capacitive transducerInductive transducerPiezoelectric TransducerFlow transducerHintA type of electroacoustic transducer 61). In which of the following application, piezoelectric transducer is used?Crystal OscillatorOperational amplifierHeartley oscillatorIntegrated circuitsHintIt is used in electronic oscillator 62). Which of the following transducer is known as an active transducer?LVDTCapacitive microphoneRVDTPiezoelectric transducerHintPiezoelectric sensor is called as an active transducer 63). Which of the following substance produces the voltage once they are mechanically forced through specific planes.Thermo-electricPiezoelectricRadio-activePhoto-electricHintThe substance used to convert the energy from mechanical to electrical 64). In electrostatic dust filters & spark ignition engines, what is the main function of piezoelectric transducer?Provides high electric powerProvides low electric powerProvides high voltage and less currentProvides less currentHintThis transducer is used to provide less current & maximum voltage 65). A Piezo-electric crystal simply melts in ________Less temperature circum-ambient because of low solubility of waterMaximum temperature circum-ambientLeast temperature circum-ambientMaximum temperature circum-ambient because of high solubility of waterHintA Piezo-electric crystal simply melts in maximum temperature. 66). When a piezoelectric crystal generates an emf?When there is no mechanical powerOnce exterior mechanical power is applied toward ‘I’Low temperature circum-ambientHighest temperature circum-ambient due to high water solubilityHintOnce external force is given, then it generates an emf 67). When Piezoelectric transducers starts working?When heat is applied to itWhen vibrations are applied to itWhen mechanical force is given to itWhen illuminations are provided to itHintThe working of this transducer mainly depends on temperature 68). Which of the following transducers are inverse transducers?Capacitive transducerInductive transducerPiezoelectric transducerFlow transducerHintPiezoelectric sensor is an inverse transducer 69). Rochelle salt & quartz materials come under the group of?Synthetic groupNatural groupFiber groupFiber/SyntheticHintOne of the natural group materials is quartz 70).Once mechanical energy is applied across the piezoelectric material then it generates….?Electrostatic chargeElectromagnetic forceVoltageSignalsHintPiezoelectric materials generate electrostatic energy 71). Which of the subsequent substance is piezo electric?Cadmium and sulphateBarium titanateLead ZirconateLead titanateHintCeramics are Piezo electric substances 72). A piezo electric crystal is used to measure…..?SoundResistanceForceVelocityHintA piezo electric crystal measures power 73). Piezo-electric transducer is used to measure?c = ∈⁄d*ac = a*dc = a∈⁄dc = a/dHintThe c = a∈⁄d can be measured using this transducer 74). Which of the following transducer is self generating?Quartz crystalCapacitivePressureTemperatureHintIt is one kind of power stone. 75). Piezoelectric crystals generate_________.PoweLess currentMaximum voltageExtremely high voltageHintPiezoelectric crystals are used in electrostatic dust filters & spark-ignition engines for generating maximum voltage.Piezoelectric Transducer MCQs for Exams 76). In which year piezoelectric effect was discovered?1882.180118801839HintPiezoelectric effect was discovered in between 1875 to 1890 77). Who invented the piezoelectric effect?Pierre & Jacques CurieJamesZhongWalterHintPiezoelectric effect was discovered by curie brothers Please refer to this link to know more about Piezoelectric Effect 78). The size of piezoelectric transducer is…LargeSmallMediumNanoHintThe size of piezoelectric transducer is tiny 79. The frequency response of piezoelectric transducer is…HighLowVery HighVery lowHintThe piezoelectric transducer has maximum frequency response 80. The transient response of piezoelectric transducer is…LowHighVery lowVery highHintThe piezoelectric transducer has maximum transient response 81). In which of the following transducer, providing the desired shape to the crystal material with ample strength is difficult?CapacitiveInductivePiezoelectricFlowHintIn 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 outputFlowPiezoelectricInductiveCapacitiveHintPiezoelectric transducer uses external circuit to provide maximum output 83). For dynamic measurement, which transducer is used?TemperaturePressureDisplacementPiezoelectricHintThe piezoelectric transducer is used where the parameters changes at the quick rate 84). which of the following sensor is used along with a Piezo transducer/sensor to measure stress, force, vibrations.Strain gaugesRadiation SensorPosition SensorProximity SensorHintBy using this sensor strain on object can be measured. 85). What is the role of piezoelectric transducer in automotive companies?To check the battery statusTo notice detonation within the blocks of engineTo check the breakersTo check the alternatorHintThis transducer is used to notice ignition within automobiles 86). What is the function of Piezoelectric transducers in industrial processing devices?To monitor the powerTo control different loadsTo discover faultsTo reduce faultsHintThe power can be monitored in industries by this transducer 87). At which temperature, synthetic crystal & Rochelle salt cannot be utilized?> 115 degree F< 115 degree F= 110 degree F98 degree FHintThe synthetic crystal & Rochelle salt is used > 115 degree F. 88). As compared to natural crystals, synthetic crystals are …?ResponsiveMore responsiveLess responseNoneHintSynthetic 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 instrumentsTachometerNanometerDigital meterHintVoltmeter is used to measure the voltage generated by a transducer. 90). Which of the following stress is used in piezoelectric transducer?CompressiveMechanicalPhysicalPsychologicalHintBoth the tensile & Compressive stresses are used in piezoelectric transducer. 91). Which of the following word is used to derive the term piezoelectric……PiezenPiezoPigeonPiezoglyptHintThe term piezoelectric is derived from Greek word. 92). Which of the following characteristic is unique for piezoelectric effect ……It is reversibleIncreasedDecreasedDistinctiveHintOnce voltage is applied to the transducer, then they change the dimension through certain plane 93). When electric field is applied to the quartz crystal then what will happen?It becomes longerShorterNo changeNone of the aboveHintWhen quartz crystal is in electric field then it becomes into longer 94). When electric field is applied in reverse direction to the quartz crystal then what will happen?It becomes shorterLongerNo changeIt will damageHintWhen an electric field is given in reverse direction then quartz crystal will become into longer 95). Which of the following condition is not suitable to measure?Variable conditionStatic conditionDynamic conditionNone of the aboveHintStatic condition is not appropriate to measure 96). Piezoelectric transducer is effected by…..VoltageCurentResistanceTemperatureHintPiezoelectric transducer will effect by temperature 97). Piezoelectric transducer is used in seismographs for measuring…?Vibrations within RocketsTo check the power in RocketsTemperature in rocketsCondition of rocketsHintThese transducers are used for measuring vibrations within rockets. 98). Which of the following modes are used in piezoelectric sensors?Voltage & charge modesCurrent modeTemperature modeResistance modeHintBoth 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?ConverterTransducerDiodeOscillatorHintA sensor or transducer converts the energy from one form to other 100). What is the mathematical expression of piezo electric transducer?Vo = gtPVo = gt/PVo = g(t/P)Vo = g(P/t)HintThe expression for piezo electric transducer is Vo = g*t*P 101). The voltage range produced by a piezo disc is?From 10 to 20VFrom 13 to 39VFrom 5 to 15VFrom 15 to 25VHintThe minimum voltage generated by a piezo disc is 13V Time is Up! Time's up
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