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.The avalanche and Zener breakdowns are the two types of reverse breakdown in the Zener diode. The Zener breakdown occurs in the thin region, in high doping materials whereas the avalanche breakdown occurs in a thick region. The Zener diode is also called the breakdown voltage of a diode or breakdown diode. There 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. The fixed bias current, fixed bias with emitter resistor, collector to base bias circuit, and potential divider bias circuit are the various biasing circuits. The Zener diodes are used in electronic devices, voltage regulators, used as a voltage reference device, etc and they have very high efficiency, they are smaller in size, and less expensive.1). Which one of the following breakdowns occurs in the thin region? Avalanche Zener Both a and b None of the above HintThe Zener breakdown occurs in the thin region, whereas the avalanche breakdown occurs in a thick region2). Which one of the following breakdowns occurs in high doping material? Avalanche Zener Both a and b None of the above HintThe zener breakdown occurs in high doping material3). Which one of the following breakdown voltages is directly proportional to the temperature? Avalanche Zener Both a and b None of the above HintThe avalanche breakdown voltage is directly proportional to the temperature4). The existence of an electric field is more on the ______________ breakdown Avalanche Zener Both a and b None of the above HintThe existence of an electric field is more on the Zener breakdown5). Which one of the following is a type of reverse breakdown in the zener diode? Avalanche Zener Both a and b None of the above HintThe avalanche and Zener breakdowns are the two types of reverse breakdown in the Zener diode6). ______________ are the few applications of zener diode Used in voltage regulators Used in electronic devices Used as a voltage reference device All of the above HintThe Zener diodes used in electronic devices, voltage regulators, used as a voltage reference device, etc7). What are the advantages of zener diode? Has very high-efficiency Less expensive Smaller in size All of the above HintThe Zener diodes have very high efficiency, they are smaller in size, and less expensive8). In which direction does the zener diode operate? Forward bias Reverse bias Both a and b None of the above HintThe Zener diodes can operate in two bias that is in forward and reverse bias9). In forward bias condition the zener diode will work as a ______________ Conventional diode Laser diode PN diode None of the above HintIn forwarding bias condition the Zener diode will work as a conventional diode10). The L or H is the measuring unit of ____________ parameter Capacitance Resistance Insulator Inductance HintThe L or H is the measuring unit of inductance 11). In which breakdown the breakdown voltage decreases with an increase in temperature? Zener PN junction Both a and b None of the above HintIn Zener breakdown, the breakdown voltage decreases with an increase in temperature12). Which one of the following breakdowns is caused by field ionization? Zener PN junction Both a and b None of the above HintThe Zener breakdown is caused by field ionization13). The electrons in ______________ breakdown, pulled from valance to conduction band Zener PN junction Both a and b None of the above HintThe electrons in Zener breakdown pulled from valance to conduction band14). What are the advantages of the series regulator? Higher current stability Simple to design Both a and b None of the above HintThe advantages of the series regulator are it has higher current stability and it is simple to design15). What are the disadvantages of three-terminal regulators? Less efficient Higher current require larger packages Both a and b None of the above HintThe disadvantages of three-terminal regulators are they are less efficient, and higher current require larger packages16). What are the disadvantages of the series regulators? Higher current stability Simple to design Inefficient None of the above HintThe disadvantage of the series regulators is they are inefficient17). An ideal diode in forward bias have _________ resistance Infinite Finite Zero None of the above HintAn ideal diode in forwarding bias have zero resistance18). In which breakdown the breakdown voltage increase with an increase in temperature? Zener PN junction Avalanche None of the above HintIn avalanche breakdown the breakdown voltage increase with an increase in temperature19). Which one of the following breakdowns is caused by impact ionization? Zener PN junction Avalanche None of the above HintThe avalanche breakdown is caused by impact ionization20). The change in voltage is given by _______________ Iz(max)=Vz+ΔVz ΔVz=ΔIz*Zz Iz(max)=Vin-Vz(max)/R None of the above HintThe change in voltage is given by ΔVz=ΔIz*Zz21). What are the advantages of the three-terminal regulators? Fewest parts Lowest output noise Lowest ripple All of the above HintThe advantages of the three-terminal regulators are it has fewest parts, has lowest output noise, and lowest ripple22). An ideal diode in reverse bias have _________ resistance Infinite Finite Zero None of the above HintAn ideal diode in reverse bias have infinite resistance23). The PN junction in forward bias offers ______________ resistance High Low Very low Very high HintThe PN junction in forwarding bias offers very low resistance24). What are the disadvantages of the zener diode? Fewer parts Simpler construction Low current All of the above HintThe disadvantage of the Zener diode is they have fewer parts, low current, and they are simple in construction Read more about Diodes25). The depletion layer in reverse bias is _______________ Very thin Thin Thick None of the above HintThe depletion layer in reverse bias is thickZener Diode Important MCQs26). The rectifier diode forward voltage drop is between _________________ 1 to 2 Volts 0.7 to 0.9 Volts 10 to 20 Volts 5 to 22 Volts HintThe rectifier diode forward voltage drop is between 0.7 to 0.9 Volts27). How many types of zener analyses are there? One Two Three Four HintThere 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 resistor28). What are the advantages of the three-terminal regulators? Lightweight Higher efficiency Small in size All of the above HintThe advantages of the three-terminal regulators are they are lightweight, has higher efficiency, and are small in size29). The PN junction in reverse bias offers ______________ resistance High Low Very low Very high HintThe PN junction in reverse bias offers very high resistance30). Which one of the following has only diodes? Controlled rectifier Half controlled rectifier Uncontrolled rectifier None of the above HintThe uncontrolled rectifier have only diodes whereas other rectifiers have thyristors31). Which one of the following breakdowns occurs in both rectifier and zener diodes? Avalanche Zener PN junction All of the above HintThe avalanche breakdown occurs in both rectifier and Zener diodes32). The uni-junction transistor is a simple _____________ layer transistor One Two Three Four HintThe uni-junction transistor is a simple two-layer transistor 33). The uni-junction transistor used to trigger _________________ SCR Pulse circuitry Both a and b None of the above HintThe uni-junction transistor used to trigger SCR, and used within pulse circuitry34). The depletion layer in forward bias is _______________ Very thin Very thick Thick None of the above HintThe depletion layer in forwarding bias is very thin35). How many types of MOSFET’S are there? One Two Three Four HintThere are two types of MOSFET’s are there they are enhancement type and depletion type36). Which one of the following is the unit of DC? Q=C*V F=1/T T=1/f R=V÷I HintThe R=V÷I is the unit of direct current 37). The FET devices are divided into _________________ types One Two Three Four HintThe FET devices are divided into three types they are junction FET, depletion mode, and enhancement mode MOSFET’s38). ______________ are the various biasing circuits Fixed bias current Fixed bias with emitter resistor Collector to base bias circuit, and potential divider bias circuit All of the above HintThe fixed bias current, fixed bias with emitter resistor, and collector to base bias circuit, and potential divider bias circuit are the various biasing circuits39). The three-layer semiconductor devices consists _____________ layers of material 2-N and 1-P type 2-P and 1-N type Both a and b None of the above HintThe three-layer semiconductor devices consists of 2-N & 1-P type, and 2-P & 1-N type layers of material40). The simple PN junction has _____________ types of bias One Two Three Four HintThe simple PN junction has two types of bias they are forward and reverse bias41). How many types of bias does two PN junction device have? One Two Three Four HintThe two PN junction devices have four types of bias42). The half-wave rectifier output DC voltage calculated by ____________ formula Vpeak/4π Vpeak/π Vpeak/8π None of the above HintThe half-wave rectifier output DC voltage calculated by Vpeak/π 43). How many types of resistances are there? One Two Three Four HintThe resistances are of three types they are DC, AC, and average AC resistance44). The common zener voltages are from ___________ 1 to 20 V 10 to 20 V 1.8 to 200 V 1 to 10 V HintThe common Zener voltages are from 1.8 to 200 V45). The zener operated in reverse bias at PIV is known as ___________ Zener current Zener voltage Both a and b None of the above HintThe Zener operated in reverse bias at PIV is known as Zener voltage46). The current controllable type and voltage controllable type are the two types of ___________ device Negative resistance Positive resistance Negative or positive resistance None of the above HintThe current controllable type and voltage controllable type are the two types of negative resistance device47). The avalanche breakdown occurs at ____________ volts >1V >5V >20V >30V HintThe avalanche breakdown occurs at greater than five volts48). Which one of the following breakdowns occurs in highly doped diodes? Zener Avalanche Both a and b None of the above HintThe zener breakdown occurs in highly doped diodes49). Which one of the following breakdowns has a sharp curve in VI characteristics? Zener Avalanche Both a and b None of the above HintThe Zener breakdown has a sharp curve in VI characteristics50). In _____________ breakdown, when the temperature increases the breakdown voltage decreases Zener Avalanche Both a and b None of the above HintIn Zener breakdown, when the temperature increases the breakdown voltage decreasesZener Diode MCQs for Quiz51). The temperature coefficient in zener breakdown is _________ Positive Negative Positive and negative Always positive HintThe temperature coefficient in Zener breakdown is negative52). The zener breakdown occurs at ____________ volts >1V <5V >20V >30V HintThe zener breakdown occurs at less than five volts53). The doping density is high in ___________ breakdown Zener Avalanche Both a and b None of the above HintThe doping density is high in Zener breakdown54). Which one of the following breakdowns doesn’t affect the voltage? Zener Avalanche Both a and b None of the above HintThe zener breakdown doesn’t affect the voltage55). The advantages of zener diode are ___________ Fewer parts Construction is simple Both a and b None of the above HintThe advantages of Zener diode are it has fewer parts and the construction is simple Read more about Zener Diode56). Which one of the following breakdowns occurs in lightly doped diodes? Zener Avalanche Both a and b None of the above HintThe avalanche breakdown occurs in lightly doped diodes57). In _____________ breakdown, when the temperature increases the breakdown voltage increases Zener Avalanche Both a and b None of the above HintIn avalanche breakdown, when the temperature increases the breakdown voltage increases58). The temperature coefficient in avalanche breakdown is _________ Positive Negative Positive and negative Always negative HintThe temperature coefficient in avalanche breakdown is positive59). The production of a pair of holes & electrons takes place in __________ breakdown Zener Avalanche Both a and b None of the above HintThe production of a pair of holes & electrons takes place in avalanche breakdown60). The doping concentration is high in ______________ breakdown Zener Avalanche Both a and b None of the above HintThe doping concentration is high in Zener breakdown61). The electric field is strong in ____________ breakdown Zener Avalanche Both a and b None of the above HintThe electric field is strong in Zener breakdown62). The temperature of zener breakdown and the breakdown voltage is inversely proportional to each other in ______________ breakdown Zener Avalanche Both a and b None of the above HintThe temperature of Zener breakdown and the breakdown voltage is inversely proportional to each other in the Zener breakdown63). Which one of the following is a type of solid dielectric breakdown? Electrical & thermal breakdown Electrochemical & electromechanical breakdown Erosion breakdown All of the above HintThe electrical & thermal breakdown, electrochemical & electromechanical breakdown, and erosion breakdown are the types of solid dielectric breakdown64). ______________ are the subtypes of electrical breakdown Intrinsic breakdown Avalanche breakdown Both a and b None of the above HintThe intrinsic and avalanche breakdown are the subtypes of electrical breakdown65). _____________ are the characteristics of intrinsic breakdown Valid at low temperature Independent of sample thickness & electrode configuration Time delay from picosecond to nanosecond All of the above HintThe intrinsic breakdown is valid at low temperature, independent of sample thickness & electrode configuration, and time delay from picosecond to nanosecond66). ________________ are the few applications of avalanche diode Voltage reference Microwave frequency generator RF noise generator All of the above HintThe voltage reference, microwave frequency generator, and RF noise generator are the few applications of avalanche diode67). The production of electrons takes place in __________ breakdown Zener Avalanche Both a and b None of the above HintThe production of electrons takes place in Zener breakdown68). ________________ are the few applications of Schottky diode Power OR circuits Power rectifier Solar cell applications All of the above HintThe power OR circuits, power rectifier, solar cell applications are the few applications of Schottky diode69). The avalanche breakdown occurs in ________________ Semiconductor materia Insulating material Both a and b None of the above HintThe avalanche breakdown occurs in the semiconductor material and insulating materials 70). Which one of the following breakdowns is a type of electron avalanche? Zener Avalanche Both a and b None of the above HintThe avalanche breakdown is a type of electron avalanche71). The zener diode is also called as _____________ diode Breakdown voltage of a diode Breakdown diode Breakdown voltage of diode or breakdown diode None of the above HintThe Zener diode is also called the breakdown voltage of a diode or breakdown diode72). 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 _________________ 10W 2W 100W None of the above HintThe maximum power rating in zener diode is 2W74). The avalanche breakdown voltage is ____________ volts for the zener One Two Four Six HintThe avalanche breakdown voltage is six volts for the Zener75). The voltage after the breakdown is known as ___________ voltage Zener Avalanche Both a and b None of the above HintThe voltage after the breakdown is known as Zener voltageZener Diode Important MCQ’s for Exams76). How many types of power supplies are there? One Two Four Six HintThere are two types of power supplies they are regulated and unregulated power supplies77). The doping density is low in ___________ breakdown Zener Avalanche Both a and b HintThe doping density is low in avalanche breakdown78). The temperature of avalanche breakdown and the breakdown voltage is inversely proportional to each other in ______________ breakdown Zener Avalanche Both a and b None of the above HintThe temperature of avalanche breakdown and the breakdown voltage is inversely proportional to each other in avalanche breakdown79). ______________ are the basic parts of automatic voltage regulator Error detecting element Stabilizing element Correcting element All of the above HintThe error detecting, stabilizing, and correcting elements are the basic parts of an automatic voltage regulator80). How many terminals does the zener diode have? One Two Four Six HintThe positive and negative or anode and cathode are the two terminals of the Zener diode81). Which one of the following is a correct formula for zener maximum current? Pzmax/Vz Pzmax*Vz Pzmax-Vz None of the above HintThe correct formula for Zener maximum current is Pzmax/Vz i.e maximum power dissipation of a Zener divided by Zener voltage82). Which one of the following breakdowns occurs at relatively low reverse voltage? Zener Avalanche Both a and b None of the above HintThe Zener breakdown occurs at a relatively low reverse voltage83). _____________ formula is used to calculate the minimum zener voltage Vz(min)=Vz-ΔVz Vz(min)=Iz-ΔVz Vz(min)=ΔVz None of the above HintThe Vz(min)=Vz-ΔVz formula is used to calculate the minimum Zener voltage84). The electrons in ______________ breakdown, pulled from conduction to valance band Zener PN junction Avalanche None of the above HintThe electrons in avalanche breakdown, pulled from conduction to valance band85). The minimum value of load resistance is calculated by _____________ Zener voltage divided by maximum load current Zener voltage divided by minimum load current Load current divided by maximum zener voltage None of the above HintThe minimum value of load resistance is calculated by Zener voltage divided by maximum load current86). _____________ formula is used to calculate the minimum zener current Iz(max)=Vz+ΔVz Iz(max)=Vin-Vz(min)/R Iz(max)=Vin-Vz(max)/R None of the above HintThe Iz(max)=Vin-Vz(min)/R formula is used to calculate the minimum Zener current87). Which one of the following is a correct formula for maximum power dissipation of a zener? Pzmax/Iz Pzmax*Iz Vz*Izmax None of the above HintThe correct formula for maximum power dissipation of a Zener is Vz*Izmax88). _____________ formula is used to calculate the maximum zener current Iz(max)=Vz+ΔVz Iz(max)=Iz-ΔVz Iz(max)=Vin-Vz(max)/R None of the above HintThe Iz(max)=Vin-Vz(max)/R formula is used to calculate the maximum Zener current89). Which one of the following has both diodes and thyristor? Controlled rectifier Half controlled rectifier Uncontrolled rectifier None of the above HintThe half controlled rectifier has both diodes and a thyristor90). Which one of the following is a formula for maximum zener current? Power/Voltage Power rating/Zener voltage Zener current/Zener Voltage None of the above HintThe formula for maximum Zener current is power rating by Zener voltage91). The R or Ω is the measuring unit of ____________ parameter Capacitance Resistance Insulator None of the above HintThe R or Ω is the measuring unit of resistance 92). Which one of the following diodes conducts only in one direction? Zener PN junction Both a and b None of the above HintThe PN junction diode conducts only in one direction93). Which one of the following is the unit of electrical charge? Q=C*V F=1/T T=1/f None of the above HintThe Q=C*V is the unit of electrical charge94). The FET was known as a _____________ transistor Unipolar Bi-polar Unipolar or bipolar None of the above HintThe FET was known as a unipolar transistor 95). How many types of zener diode regulators are there? One Two Three Four HintThe Zener diode regulators are of two types they are line and load regulation96). The doping at the junction is minimum in _____________ breakdown Zener Avalanche Both a and b None of the above HintThe doping at the junction is minimum in avalanche breakdown 97). The tunneling effect takes place in __________ breakdown Zener Avalanche Both a and b None of the above HintThe tunneling effect takes place in Zener breakdown98). _____________ formula is used to calculate the maximum zener voltage Vz(max)=Vz+ΔVz Vz(max)=Iz-ΔVz Vz(min)=ΔVz None of the above HintThe Vz(max)=Vz+ΔVz formula is used to calculate the maximum Zener voltage99). Which one of the following doesn’t have units or dimensions? Dielectric constant Dielectric strength Both a and b None of the above HintThe dielectric constant has no dimensions or units100). In normal diodes, the doping intensity is ____________ compare to zener diode High Very high Moderate low HintIn normal diodes, the doping intensity is low compare to Zener diodes Time is Up! Time's up
