Zener Diode Question & AnswersOctober 11, 2021 By WatElectronics This article lists 100 Zener Diode MCQs for Engineering Students. All the Zener Diode Questions & Answers given below includes solution and link wherever possible to the relevant topic.The Zener diodes are the special diodes that are widely used in voltage regulation. The avalanche breakdown and the Zener breakdown are the two types of breakdowns in the Zener diode. The working of a Zener diode is similar to the PN junction diode in forwarding biased conditions. The avalanche breakdown occurs in lightly doped diodes, in the case of lightly doped diodes when you apply high reverse bias potential the electrons will gain the kinetic energy and they will break the covalent bond and collide with other electrons. 1). Which one of the following breakdowns occurs in the thin region?AvalancheZenerBoth a and bNone of the aboveHintThe Zener breakdown occurs in the thin region, whereas the avalanche breakdown occurs in a thick region 2). Which one of the following breakdowns occurs in high doping material?Avalanche b) c)d)ZenerBoth a and bNone of the aboveHintThe zener breakdown occurs in high doping material 3). Which one of the following breakdown voltages is directly proportional to the temperature?AvalancheZenerBoth a and bNone of the aboveHintThe avalanche breakdown voltage is directly proportional to the temperature 4). The existence of an electric field is more on the ______________ breakdownAvalancheZenerBoth a and bNone of the aboveHintThe existence of an electric field is more on the Zener breakdown 5). Which one of the following is a type of reverse breakdown in the zener diode?AvalancheZenerBoth a and bNone of the aboveHintThe avalanche and Zener breakdowns are the two types of reverse breakdown in the Zener diode 6). ______________ are the few applications of zener diodeUsed in voltage regulatorsUsed in electronic devicesUsed as a voltage reference deviceAll of the aboveHintThe Zener diodes used in electronic devices, voltage regulators, used as a voltage reference device, etc 7). What are the advantages of zener diode?Has very high-efficiencyLess expensiveSmaller in sizeAll of the aboveHintThe Zener diodes have very high efficiency, they are smaller in size, and less expensive 8). In which direction does the zener diode operate?Forward biasReverse biasBoth a and bNone of the aboveHintThe Zener diodes can operate in two bias that is in forward and reverse bias 9). In forward bias condition the zener diode will work as a ______________Conventional diodeLaser diodePN diodeNone of the aboveHintIn forwarding bias condition the Zener diode will work as a conventional diode 10). The L or H is the measuring unit of ____________ parameterCapacitanceResistanceInsulatorInductanceHintThe L or H is the measuring unit of inductance 11). In which breakdown the breakdown voltage decreases with an increase in temperature?ZenerPN junctionBoth a and bNone of the aboveHintIn Zener breakdown, the breakdown voltage decreases with an increase in temperature 12). Which one of the following breakdowns is caused by field ionization?ZenerPN junctionBoth a and bNone of the aboveHintThe Zener breakdown is caused by field ionization 13). The electrons in ______________ breakdown, pulled from valance to conduction bandZenerPN junctionBoth a and bNone of the aboveHintThe electrons in Zener breakdown pulled from valance to conduction band 14). What are the advantages of the series regulator?Higher current stabilitySimple to designBoth a and bNone of the aboveHintThe advantages of the series regulator are it has higher current stability and it is simple to design 15). What are the disadvantages of three-terminal regulators?Less efficientHigher current require larger packagesBoth a and bNone of the aboveHintThe disadvantages of three-terminal regulators are they are less efficient, and higher current require larger packages 16). What are the disadvantages of the series regulators?Higher current stabilitySimple to designInefficientNone of the aboveHintThe disadvantage of the series regulators is they are inefficient 17). An ideal diode in forward bias have _________ resistanceInfiniteFiniteZeroNone of the aboveHintAn ideal diode in forwarding bias have zero resistance 18). In which breakdown the breakdown voltage increase with an increase in temperature?ZenerPN junctionAvalancheNone of the aboveHintIn avalanche breakdown the breakdown voltage increase with an increase in temperature 19). Which one of the following breakdowns is caused by impact ionization?ZenerPN junctionAvalancheNone of the aboveHintThe avalanche breakdown is caused by impact ionization 20). The change in voltage is given by _______________Iz(max)=Vz+ΔVzΔVz=ΔIz*ZzIz(max)=Vin-Vz(max)/RNone of the aboveHintThe change in voltage is given by ΔVz=ΔIz*Zz 21). What are the advantages of the three-terminal regulators?Fewest partsLowest output noiseLowest rippleAll of the aboveHintThe advantages of the three-terminal regulators are it has fewest parts, has lowest output noise, and lowest ripple 22). An ideal diode in reverse bias have _________ resistanceInfiniteFiniteZeroNone of the aboveHintAn ideal diode in reverse bias have infinite resistance 23). The PN junction in forward bias offers ______________ resistanceHighLowVery lowVery highHintThe PN junction in forwarding bias offers very low resistance 24). What are the disadvantages of the zener diode?Fewer partsSimpler constructionLow currentAll of the aboveHintThe disadvantage of the Zener diode is they have fewer parts, low current, and they are simple in construction Read more about Diodes 25). The depletion layer in reverse bias is _______________Very thinThinThickNone of the aboveHintThe depletion layer in reverse bias is thickZener Diode Important MCQs 26). The rectifier diode forward voltage drop is between _________________1 to 2 Volts0.7 to 0.9 Volts10 to 20 Volts5 to 22 VoltsHintThe rectifier diode forward voltage drop is between 0.7 to 0.9 Volts 27). How many types of zener analyses are there?OneTwoThreeFourHintThere are three types of Zener analysis are there they are fixed DC voltage & load resistor, fixed DC voltage & variable load resistor, and variable DC voltage & fixed load resistor 28). What are the advantages of the three-terminal regulators?LightweightHigher efficiencySmall in sizeAll of the aboveHintThe advantages of the three-terminal regulators are they are lightweight, has higher efficiency, and are small in size 29). The PN junction in reverse bias offers ______________ resistanceHighLowVery lowVery highHintThe PN junction in reverse bias offers very high resistance 30). Which one of the following has only diodes?Controlled rectifierHalf controlled rectifierUncontrolled rectifierNone of the aboveHintThe uncontrolled rectifier have only diodes whereas other rectifiers have thyristors 31). Which one of the following breakdowns occurs in both rectifier and zener diodes?AvalancheZenerPN junctionAll of the aboveHintThe avalanche breakdown occurs in both rectifier and Zener diodes 32). The uni-junction transistor is a simple _____________ layer transistorOneTwoThreeFourHintThe uni-junction transistor is a simple two-layer transistor 33). The uni-junction transistor used to trigger _________________SCRPulse circuitryBoth a and bNone of the aboveHintThe uni-junction transistor used to trigger SCR, and used within pulse circuitry 34). The depletion layer in forward bias is _______________Very thinVery thickThickNone of the aboveHintThe depletion layer in forwarding bias is very thin 35). How many types of MOSFET’S are there?OneTwoThreeFourHintThere are two types of MOSFET’s are there they are enhancement type and depletion type 36). Which one of the following is the unit of DC?Q=C*VF=1/TT=1/fR=V÷IHintThe R=V÷I is the unit of direct current 37). The FET devices are divided into _________________ typesOneTwoThreeFourHintThe FET devices are divided into three types they are junction FET, depletion mode, and enhancement mode MOSFET’s 38). ______________ are the various biasing circuitsFixed bias currentFixed bias with emitter resistorCollector to base bias circuit, and potential divider bias circuitAll of the aboveHintThe fixed bias current, fixed bias with emitter resistor, and collector to base bias circuit, and potential divider bias circuit are the various biasing circuits 39). The three-layer semiconductor devices consists _____________ layers of material2-N and 1-P type2-P and 1-N typeBoth a and bNone of the aboveHintThe three-layer semiconductor devices consists of 2-N & 1-P type, and 2-P & 1-N type layers of material 40). The simple PN junction has _____________ types of biasOneTwoThreeFourHintThe simple PN junction has two types of bias they are forward and reverse bias 41). How many types of bias does two PN junction device have?OneTwoThreeFourHintThe two PN junction devices have four types of bias 42). The half-wave rectifier output DC voltage calculated by ____________ formulaVpeak/4πVpeak/πVpeak/8πNone of the aboveHintThe half-wave rectifier output DC voltage calculated by Vpeak/π 43). How many types of resistances are there?OneTwoThreeFourHintThe resistances are of three types they are DC, AC, and average AC resistance 44). The common zener voltages are from ___________1 to 20 V10 to 20 V1.8 to 200 V1 to 10 VHintThe common Zener voltages are from 1.8 to 200 V 45). The zener operated in reverse bias at PIV is known as ___________Zener currentZener voltageBoth a and bNone of the aboveHintThe Zener operated in reverse bias at PIV is known as Zener voltage 46). The current controllable type and voltage controllable type are the two types of ___________ deviceNegative resistancePositive resistanceNegative or positive resistanceNone of the aboveHintThe current controllable type and voltage controllable type are the two types of negative resistance device 47). The avalanche breakdown occurs at ____________ volts>1V>5V>20V>30VHintThe avalanche breakdown occurs at greater than five volts 48). Which one of the following breakdowns occurs in highly doped diodes?ZenerAvalancheBoth a and bNone of the aboveHintThe zener breakdown occurs in highly doped diodes 49). Which one of the following breakdowns has a sharp curve in VI characteristics?ZenerAvalancheBoth a and bNone of the aboveHintThe Zener breakdown has a sharp curve in VI characteristics 50). In _____________ breakdown, when the temperature increases the breakdown voltage decreasesZenerAvalancheBoth a and bNone of the aboveHintIn Zener breakdown, when the temperature increases the breakdown voltage decreasesZener Diode MCQs for Quiz 51). The temperature coefficient in zener breakdown is _________PositiveNegativePositive and negativeAlways positiveHintThe temperature coefficient in Zener breakdown is negative 52). The zener breakdown occurs at ____________ volts>1V<5V>20V>30VHintThe zener breakdown occurs at less than five volts 53). The doping density is high in ___________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe doping density is high in Zener breakdown 54). Which one of the following breakdowns doesn’t affect the voltage?ZenerAvalancheBoth a and bNone of the aboveHintThe zener breakdown doesn’t affect the voltage 55). The advantages of zener diode are ___________Fewer partsConstruction is simpleBoth a and bNone of the aboveHintThe advantages of Zener diode are it has fewer parts and the construction is simple Read more about Zener Diode 56). Which one of the following breakdowns occurs in lightly doped diodes?ZenerAvalancheBoth a and bNone of the aboveHintThe avalanche breakdown occurs in lightly doped diodes 57). In _____________ breakdown, when the temperature increases the breakdown voltage increasesZenerAvalancheBoth a and bNone of the aboveHintIn avalanche breakdown, when the temperature increases the breakdown voltage increases 58). The temperature coefficient in avalanche breakdown is _________PositiveNegativePositive and negativeAlways negativeHintThe temperature coefficient in avalanche breakdown is positive 59). The production of a pair of holes & electrons takes place in __________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe production of a pair of holes & electrons takes place in avalanche breakdown 60). The doping concentration is high in ______________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe doping concentration is high in Zener breakdown 61). The electric field is strong in ____________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe electric field is strong in Zener breakdown 62). The temperature of zener breakdown and the breakdown voltage is inversely proportional to each other in ______________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe temperature of Zener breakdown and the breakdown voltage is inversely proportional to each other in the Zener breakdown 63). Which one of the following is a type of solid dielectric breakdown?Electrical & thermal breakdownElectrochemical & electromechanical breakdownErosion breakdownAll of the aboveHintThe electrical & thermal breakdown, electrochemical & electromechanical breakdown, and erosion breakdown are the types of solid dielectric breakdown 64). ______________ are the subtypes of electrical breakdownIntrinsic breakdownAvalanche breakdownBoth a and bNone of the aboveHintThe intrinsic and avalanche breakdown are the subtypes of electrical breakdown 65). _____________ are the characteristics of intrinsic breakdownValid at low temperatureIndependent of sample thickness & electrode configurationTime delay from picosecond to nanosecondAll of the aboveHintThe intrinsic breakdown is valid at low temperature, independent of sample thickness & electrode configuration, and time delay from picosecond to nanosecond 66). ________________ are the few applications of avalanche diodeVoltage referenceMicrowave frequency generatorRF noise generatorAll of the aboveHintThe voltage reference, microwave frequency generator, and RF noise generator are the few applications of avalanche diode 67). The production of electrons takes place in __________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe production of electrons takes place in Zener breakdown 68). ________________ are the few applications of Schottky diodePower OR circuitsPower rectifierSolar cell applicationsAll of the aboveHintThe power OR circuits, power rectifier, solar cell applications are the few applications of Schottky diode 69). The avalanche breakdown occurs in ________________Semiconductor materiaInsulating materialBoth a and bNone of the aboveHintThe avalanche breakdown occurs in the semiconductor material and insulating materials 70). Which one of the following breakdowns is a type of electron avalanche?ZenerAvalancheBoth a and bNone of the aboveHintThe avalanche breakdown is a type of electron avalanche 71). The zener diode is also called as _____________ diodeBreakdown voltage of a diodeBreakdown diodeBreakdown voltage of diode or breakdown diodeNone of the aboveHintThe Zener diode is also called the breakdown voltage of a diode or breakdown diode 72). In zener diode the voltage tolerance is typically ___________±1%±2%±3%±5%HintIn the Zener diode, the voltage tolerance is typically ±5% 73). The maximum power rating in zener diode is _________________10W2W100WNone of the aboveHintThe maximum power rating in zener diode is 2W 74). The avalanche breakdown voltage is ____________ volts for the zenerOneTwoFourSixHintThe avalanche breakdown voltage is six volts for the Zener 75). The voltage after the breakdown is known as ___________ voltageZenerAvalancheBoth a and bNone of the aboveHintThe voltage after the breakdown is known as Zener voltageZener Diode Important MCQ’s for Exams 76). How many types of power supplies are there?OneTwoFourSixHintThere are two types of power supplies they are regulated and unregulated power supplies 77). The doping density is low in ___________ breakdownZenerAvalancheBoth a and bHintThe doping density is low in avalanche breakdown 78). The temperature of avalanche breakdown and the breakdown voltage is inversely proportional to each other in ______________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe temperature of avalanche breakdown and the breakdown voltage is inversely proportional to each other in avalanche breakdown 79). ______________ are the basic parts of automatic voltage regulatorError detecting elementStabilizing elementCorrecting elementAll of the aboveHintThe error detecting, stabilizing, and correcting elements are the basic parts of an automatic voltage regulator 80). How many terminals does the zener diode have?OneTwoFourSixHintThe positive and negative or anode and cathode are the two terminals of the Zener diode 81). Which one of the following is a correct formula for zener maximum current?Pzmax/VzPzmax*VzPzmax-VzNone of the aboveHintThe correct formula for Zener maximum current is Pzmax/Vz i.e maximum power dissipation of a Zener divided by Zener voltage 82). Which one of the following breakdowns occurs at relatively low reverse voltage?ZenerAvalancheBoth a and bNone of the aboveHintThe Zener breakdown occurs at a relatively low reverse voltage 83). _____________ formula is used to calculate the minimum zener voltageVz(min)=Vz-ΔVzVz(min)=Iz-ΔVzVz(min)=ΔVzNone of the aboveHintThe Vz(min)=Vz-ΔVz formula is used to calculate the minimum Zener voltage 84). The electrons in ______________ breakdown, pulled from conduction to valance bandZenerPN junctionAvalancheNone of the aboveHintThe electrons in avalanche breakdown, pulled from conduction to valance band 85). The minimum value of load resistance is calculated by _____________Zener voltage divided by maximum load currentZener voltage divided by minimum load currentLoad current divided by maximum zener voltageNone of the aboveHintThe minimum value of load resistance is calculated by Zener voltage divided by maximum load current 86). _____________ formula is used to calculate the minimum zener currentIz(max)=Vz+ΔVzIz(max)=Vin-Vz(min)/RIz(max)=Vin-Vz(max)/RNone of the aboveHintThe Iz(max)=Vin-Vz(min)/R formula is used to calculate the minimum Zener current 87). Which one of the following is a correct formula for maximum power dissipation of a zener?Pzmax/IzPzmax*IzVz*IzmaxNone of the aboveHintThe correct formula for maximum power dissipation of a Zener is Vz*Izmax 88). _____________ formula is used to calculate the maximum zener currentIz(max)=Vz+ΔVzIz(max)=Iz-ΔVzIz(max)=Vin-Vz(max)/RNone of the aboveHintThe Iz(max)=Vin-Vz(max)/R formula is used to calculate the maximum Zener current 89). Which one of the following has both diodes and thyristor?Controlled rectifierHalf controlled rectifierUncontrolled rectifierNone of the aboveHintThe half controlled rectifier has both diodes and a thyristor 90). Which one of the following is a formula for maximum zener current?Power/VoltagePower rating/Zener voltageZener current/Zener VoltageNone of the aboveHintThe formula for maximum Zener current is power rating by Zener voltage 91). The R or Ω is the measuring unit of ____________ parameterCapacitanceResistanceInsulatorNone of the aboveHintThe R or Ω is the measuring unit of resistance 92). Which one of the following diodes conducts only in one direction?ZenerPN junctionBoth a and bNone of the aboveHintThe PN junction diode conducts only in one direction 93). Which one of the following is the unit of electrical charge?Q=C*VF=1/TT=1/fNone of the aboveHintThe Q=C*V is the unit of electrical charge 94). The FET was known as a _____________ transistorUnipolarBi-polarUnipolar or bipolarNone of the aboveHintThe FET was known as a unipolar transistor 95). How many types of zener diode regulators are there?OneTwoThreeFourHintThe Zener diode regulators are of two types they are line and load regulation 96). The doping at the junction is minimum in _____________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe doping at the junction is minimum in avalanche breakdown 97). The tunneling effect takes place in __________ breakdownZenerAvalancheBoth a and bNone of the aboveHintThe tunneling effect takes place in Zener breakdown 98). _____________ formula is used to calculate the maximum zener voltageVz(max)=Vz+ΔVzVz(max)=Iz-ΔVzVz(min)=ΔVzNone of the aboveHintThe Vz(max)=Vz+ΔVz formula is used to calculate the maximum Zener voltage 99). Which one of the following doesn’t have units or dimensions?Dielectric constantDielectric strengthBoth a and bNone of the aboveHintThe dielectric constant has no dimensions or units 100). In normal diodes, the doping intensity is ____________ compare to zener diodeHighVery highModeratelowHintIn normal diodes, the doping intensity is low compare to Zener diodes Time is Up! Time's up
