PN Junction Diode Question & AnswersFebruary 15, 2022 By WatElectronics This article lists 100 PN Junction Diodes MCQs for Engineering Students. All the PN Junction Diodes Questions & Answers given below includes solution and 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 the PN junction diode.The diodes are non-ohmic conductors which means the diodes don't obey the ohms law. The filament lamps, transistors, thyristors, electrolytes, semiconductors, diodes, etc are examples of non-ohmic conductors. The nichrome wires, silver, metals, copper wires, resistors, etc are examples of ohmic conductors. The PN junction diodes are much smaller in size, cheaper, operate with a low voltage source, and they are strong and not easily destroyed. The general purpose PN junction diodes use only two layers they are n-type layer and the p-type layer. The purpose PN junction diodes cannot be used for microwave applications.In PN junction diodes the cut-in voltage is large that is about 0.7 V and the ideal factor is about 1.2-2.0 due to recombination in depletion layers. The electricity in this diode flows only in one direction and it is used for rectification. The reverse bias in the PN junction diode permanently damages the depletion region and the width of the depletion region is large because of n and p region is lightly doped. The PN junction diodes need less power for the operation and use silicon and germanium materials.1). In which one of the following diodes the cut-in voltage is large? Schottky diode PN diode Both a and b None of the above HintIn schottky diode the cut-in voltage is small that is about 0.3 V2). The forward current in schottky diode is due to ________________________? Thermionic emission Diffusion current Both a and b None of the above HintThe forward current in PN diode is due to diffusion current3). The switching speed is high in __________________________ diode? Schottky diode PN diode Both a and b None of the above HintThe switching speed is limited in the PN diode4). Which one of the following diodes is used for rectification? Zener diode PN junction diode Both a and b None of the above HintThe zener diode used for voltage regulation5). The reverse current effect damage the junction in __________________ diode? Zener diode PN junction diode Both a and b None of the above HintThe reverse current effect doesn't damage the junction in the Zener diode6). In which one of the following diode the doping level is low? Zener diode PN junction diode Both a and b None of the above HintThe doping level is high in the Zener junction diode7). Which one of the following diodes doesn't obey ohms law? Zener diode PN junction diode Both a and b None of the above HintThe PN junction diode obey ohms law8). Which one of the following diodes uses three layers? PIN diode Both a and b General purpose PN junction diode None of the above HintThe general purpose PN junction diode uses two layers9). In which one of the following diodes does the forward resistance varies? PIN diode General purpose PN junction diode Both a and b None of the above HintIn a general-purpose PN junction diode the forward resistance is constant10). In which one of the following diodes the cut-in voltage is small? Schottky diode PN diode Both a and b None of the above HintIn PN junction diode the cut in voltage is large that is about 0.7 V11). The forward current in PN diode is due to ________________________? Thermionic emission Diffusion current Both a and b None of the above HintThe forward current in the Schottky diode is due to thermionic emission12). The reverse current effect damage the junction in __________________ diode? Zener diode PN junction diode Both a and b None of the above HintThe reverse current effect damage the junction in the PN junction diode13). In which one of the following diode the doping level is high? Zener diode PN junction diode Both a and b None of the above HintThe doping level is low in the PN junction diode14). Which one of the following diodes doesn't obey ohms law? Zener diode PN junction diode Both a and b None of the above HintThe Zener diode doesn't obey ohms law15). Which one of the following diodes uses two layers? PIN diode General purpose PN junction diode Both a and b None of the above HintThe PIN diode uses three layers16). In which one of the following diode the forward resistance is constant? PIN diode General purpose PN junction diode Both a and b None of the above HintIn PIN diode the forward resistance is varies17). Which one of the following diodes can't be used for microwave applications? PIN diode General purpose PN junction diode Both a and b None of the above HintThe PIN diode can be used for microwave application18). How many types of biasing circuits are there? One Two Three Four HintThe self-bias and voltage divider bias are two types of biasing circuits19). What are the important characteristics of JFET? Drain and VI Transfer Both a and b None of the above HintThe drain or VI and transfer characteristics are important characteristics of JFET20). How many ways are there to control the channel width? One Two Three Four HintThe are two ways to control the channel width they are by varying the value of vgs and by varying the value of vds holding vgs constant21). What are the applications of the PN junction diode? Can be used as a photodiode Can be used as solar cell Can be used as rectifiers All of the above HintThe PN junction diode can be used as rectifiers, solar cells, photodiodes, etc22). How many biasing conditions are there for the PN junction diode? One Two Three Four HintThe zero bias, forward bias, and reverse bias are the three biasing conditions for PN junction diode23). Which one of the following diodes is used for HF rectification, detection? Signal diode Zener diode PIN diode None of the above HintThe Zener diode is used for voltage reference, PIN diode is used for RF switching diode24). When the semiconductor is _____________________ the hall voltage is zero? Extrinsic Intrinsic Both a and b None of the above HintWhen the semiconductor is extrinsic the hall voltage is zero25). The reverse bias PN junction capacitance increases when ________________________ decreased? Reverse bias Forward bias Both a and b None of the above HintThe reverse bias PN junction capacitance increases when reverse bias decreasedPN Junction Diode MCQs for Quiz26). Which one of the following diodes is used for power limiters? PIN Power Both a and b None of the above HintThe power diode is not used for power limiter27). What is the standard form of TVS? Transistor Voltage Suppression Transformer Voltage Suppression Transient Voltage Suppression None of the above HintTransient Voltage Suppression is one type of diode28). What is the standard form of SBD? Supper Barrier Diode Surface Barrier Diode Suppression Barrier Diode None of the above HintThe Supper Barrier Diode is one type of rectifier diode29). The supper barrier diode has _____________________________ forward voltage? Low High Very high Moderate HintThe Supper Barrier Diode is one type of rectifier diode that has low forward voltage, fast switching capability, and less reverse leakage current30). Which one of the following diodes is used for voltage reference? Signal diode Zener diode PIN diode None of the above HintThe signal diode is used for HF rectification, detection, PIN diode is used for RF switching diode Read more about Zener Diodes31). The solids based on the conductivity categorized into _________________________ types? Two Three Four Six HintThe semiconductor, conductor, and insulator are the type of solids based on the conductivity32). Which one of the following is an example for insulators? Mica Silicon Carbon None of the above HintSilicon and carbon are examples of semiconductors33). Which one of the following is an example for semiconductors? Mica Rubber Carbon None of the above HintThe mica and rubber are examples of insulators34). Which one of the following detects the gamma and x-ray photons? Photodetector Attenuators RF switches None of the above HintThe attenuators used as shunt resistance and bridge in bridge T attenuator35). Which one of the following is used for constant current source? Current regulator Zener diode Varactor diode None of the above HintThe Zener diode is used for voltage reference, and the varactor diode is used for TV receivers and tuning diode36). Which one of the following is used as shunt resistance and bridge in bridge T attenuator? Photodetector Attenuators RF switches None of the above HintThe photodetectors detect the gamma and x-ray photons37). Which one of the following has a large energy gap? Conductors Semiconductors Insulators None of the above HintThe energy gap is moderate in semiconductors and very small in conductors38). The maximum recurrent peak reverse voltage of IN4007 PN junction diode is around _________________________ volts? 1000V 2000V 160V None of the above HintThe maximum recurrent peak reverse voltage of IN4007 PN junction diode is around 1000 volts not more than 1000 volts39). The maximum RMS voltage of IN4007 PN junction diode is around _________________________ volts? 1000V 2000V 700V None of the above HintThe maximum RMS voltage of the IN4007 PN junction diode is around 700 volts40). Which one of the following diodes is used for RF switching diode? Signal diode Zener diode PIN diode None of the above HintThe signal diode is used for HF rectification, detection, Zener diode is used for voltage reference41). In which one of the following the current flows easily? Conductors Semiconductors Insulators None of the above HintOnly a little current can flow in semiconductor whereas in insulators no current flows42). The maximum DC blocking voltage of IN4007 PN junction diode is around _________________________ volts? 1000V 2000V 700V None of the above HintThe maximum DC blocking voltage of IN4007 PN junction diode is around 1000 volts not more than 1000 volts43). The average forward current of IN4007 PN junction diode is around _________________________ amperes? 1000A 2000A 1.0A None of the above HintThe average forward current of IN4007 PN junction diode is around 1.0 amperes44). How many terminals does an IN4007 PN junction IC have? One Two Three Four HintThe cathode is a negatively charged terminal and the anode is a positively charged terminal45). Which one of the following is a symbol for tunnel diode? Figure (a) Figure (b) Figure (c) Figure (d) HintThe tunnel diodes are low cost, has high speed and low power46). When the current flows from anode terminal to cathode terminal then the current is said to be ________________________ current? Forward Reverse Both a and b None of the above HintWhen the current flows from cathode terminal to anode terminal then the current is said to be reverse current47). The IN4007 PN junction diode IC has ________________________ forward voltage drop? High Low Very high Moderate HintThe IN4007 PN junction diode IC has a low forward voltage drop and very high reverse peak voltage48). In _________________________ the conductivity lies between insulator's and conductors? Insulator's Semiconductors Both a and b None of the above HintCarbon, silicon, germanium, etc are examples of semiconductors49). In which one of the following does the electricity can't pass? Insulator's Semiconductors Conductors None of the above HintThe electricity can pass easily in conductors50). Which one of the following diodes is used for seven-segment displays? Signal diode Zener diode PIN diode LED HintThe signal diode is used for HF rectification, detection, Zener diode is used for voltage reference, and PIN diode is used for RF switching diodePN Junction Diode MCQs for Interviews51). In which one of the following only a little current flows? Conductors Semiconductors Insulators None of the above HintOnly a little current can flow in semiconductor whereas in insulators no current flows52). The peak forward surge current of IN4007 PN junction diode is around _________________________ amperes? 1000A 2000A 30A None of the above HintThe peak forward surge current of IN4007 PN junction diode is around 30 amperes not more than 30A53). When the current flows from cathode terminal to anode terminal then the current is said to be ________________________ current? Forward Reverse Both a and b None of the above HintWhen the current flows from anode terminal to cathode terminal then the current is said to be forward current54). In which one of the following electricity can pass easily? Insulator's Semiconductors Conductors None of the above HintIn an insulator's electricity can't pass, the mica, rubber, etc are the examples of insulator's55). Which one of the following diodes is used for high-frequency oscillators? Tunnel diode Zener diode Varactor diode None of the above HintThe zener diode is used for voltage reference, and varactor diode is used for TV receivers and tuning diode56). The supper barrier diode has _____________________________ reverse leakage current? Low High Very high Moderate HintThe Supper Barrier Diode is one type of rectifier diode that has low forward voltage, fast switching capability, and low forward voltage57). Which one of the following diodes is also known as Cat Whisker diode? Point Schottky Rectifier None of the above HintThe point diode is also known as crystal diode or Cat Whisker diode58). How many layers does Shockley diode consist of? Two Four Six None of the above HintThe shockley is a type of PNPN diode59). The reverse breakdown voltage is ________________________ in Schottky diode? High Low Very high Moderate HintThe reverse breakdown voltage is low in the Schottky diode and the reverse leakage current is high60). Which one of the following diodes is used for light detection? Signal diode Zener diode Photodiode None of the above HintThe signal diode is used for HF rectification, detection, and the zener diode is used for voltage reference61). Which one of the following is a symbol for junction diode? Figure (a) Figure (b) Figure (c) Figure (d) HintThe pros of junction diode is it occupies less space in circuits62). In which one of the following no current flows? Conductors Semiconductors Insulators None of the above HintOnly a little current can flow in semiconductors whereas in insulators no current flows63). The maximum instantaneous forward voltage of IN4007 PN junction diode is around _________________________ volts? 1.0V 2V 3V None of the above HintThe maximum instantaneous forward voltage of IN4007 PN junction diode is around 1.0 volts64). The typical junction capacitance of IN4007 PN junction diode is around _________________________ PF? 60 40 15 None of the above HintThe typical junction capacitance of the IN4007 PN junction diode is around 15 PF not more than 15PF65). Which one of the following diodes is used for reading, writing CD, DVD, etc? Laser diode Zener diode Varactor diode None of the above HintThe Zener diode is used for voltage reference, and the varactor diode is used for TV receivers and tuning diode66). Which one of the following moderate energy gaps? Conductors Semiconductors Insulators None of the above HintThe energy gap is very small in conductors and high in insulators67). The typical reverse recovery time of IN4007 PN junction diode is around _________________________ us? 2.0 40 15 None of the above HintThe typical reverse recovery time of IN4007 PN junction diode is around 2.0 us not more than 2 us68). The operating temperature of IN4007 PN junction diode is around _________________________ centigrade? -1 ~150 degree -5 ~150 degree -55 ~150 degree None of the above HintThe operating temperature of IN4007 PN junction diode is around -55 ~150 degree centigrade69). The photo diodes are categorized into ___________________________ types? Two Three Four Five HintThe PN, PIN, Schottky, and avalanche are the type of photodiodes70). Which one of the following is used for electrical isolation? Signal diode Zener diode Optocoupler None of the above HintThe signal diode is used for HF rectification, detection, and zener diode is used for voltage reference71). The reverse leakage current is ________________________ in Schottky diode? High Low Very high Moderate HintThe reverse breakdown voltage is low in the Schottky diode and the reverse breakdown voltage is low72). The IN4007 PN junction diode IC has ________________________ reverse peak voltage? High Low Very high Moderate HintThe IN4007 PN junction diode IC has a low forward voltage drop and very high reverse peak voltage73). Which one of the following bands contains conduction electrons? Valence Forbidden Conduction None of the above HintThe valence band contains Valence electrons74). The rate of radiative recombination divided by total rate of recombination is known as ___________________________ efficiency? External quantum Internal quantum External conversion None of the above HintThe optical power output divided by electrical power output is known as external conversion efficiency75). What are the advantages of the PN junction diode? Smaller Cheaper Strong and not easily destroyed All of the above HintThe PN junction diodes are smaller, cheaper, strong, and not easily destroyedPN Junction Diode MCQs for Exams76). Which one of the following is a symbol for LDR? Figure (a) Figure (b) Figure (c) Figure (d) HintThe light-dependent resistor is one type of an electronic component77). What is the standard form of LDR? Light Diode Resistor Light Dependent Resistor Light Diffusion Resistor None of the above HintThe Light Dependent Resistor is one type of an electronic component78). Which one of the following is a symbol for the Zener diode? Figure (a) Figure (b) Figure (c) Figure (d) HintThe Zener diodes are less expensive compared to other diodes79). Which one of the following is used for very small signal rectification? Back diode Zener diode Varactor diode None of the above HintThe Zener diode is used for voltage reference, and the varactor diode is used for TV receivers and tuning diode80). Which one of the following is used for VHF rectification? Signal diode Zener diode Schottky diode None of the above HintThe signal diode is used for HF rectification, detection, and zener diode is used for voltage reference81). The reverse leakage current is ________________________ in super barrier diodes? High Low Very high Moderate HintThe reverse leakage current is low in super barrier diodes whereas in the Schottky diode the leakage current is high82). What are the advantages of laser diodes? Small in size Small in weight Has wide angle beam All of the above HintThe PN, PIN, Schottky, and avalanche are the type of photodiodes83). The current always enters through ___________________ pin? Anode Cathode Both a and b None of the above HintThe current always exists through cathode pin84). The power dissipation of IN4007 PN junction diode is around _____________ watts? One Two Three Four HintThe power dissipation of IN4007 PN junction diode is around three watts85). The IN4007 PN junction diode IC has ______________ current carrying capability? High Low Very high Moderate HintThe IN4007 PN junction diode IC has a low forward voltage drop and very high reverse peak voltage86). Which one of the following bands contains valence electrons? Valence Forbidden Conduction None of the above HintThe conduction band contains conduction electrons87). The optical power output divided by electrical power output is known as _____________________ efficiency ? External quantum Internal quantum External conversion None of the above HintThe rate of radiative recombination divided by the total rate of recombination is known as internal efficiency88). Which one of the following is a symbol for Buzzer? Figure (a) Figure (b) Figure (c) Figure (d) HintThe buzzer is one type of voice device used in household appliances, in industries, in toys, etc89). In which one of the following filter the voltage regulation is poor? C filter L filter LC filter None of the above HintThe voltage regulation is moderate in L filter and goof in LC filter90). Which one of the following is used for AC line spike protection? Signal diode Zener diode Varistor None of the above HintThe signal diode is used for HF rectification, detection, and zener diode is used for voltage reference91). The forward voltage is ________________________ in super barrier diodes? High Low Very high Moderate HintThe reverse leakage current and the forward voltage is low in super barrier diodes92). ___________________ are the biasing of PN junction semiconductor diode? Zero bias Forward bias Reverse bias All of the above HintThe zero bias, forward bias, and reverse bias are the three types of PN junction semiconductor diode biasing conditions Read more about Diodes93). Which one of the following integrated circuits has transistors and diode? Film Hybrid Monolithic None of the above HintThe film circuits have components like resistance and capacitors94). Which one of the following circuits is a combination of film circuit and monolithic integrated circuit? Film Hybrid Monolithic None of the above HintThe film circuits and monolithic integrated circuits has components like capacitors and resistance95). The current always exists through ___________________ pin? Anode Cathode Both a and b None of the above HintThe current always enters through an anode pin96). Which one of the following is a symbol for thermistor? Figure (a) Figure (b) Figure (c) Figure (d) HintThe resistance of the thermistor depends on the temperature97). Which one of the following is a symbol for Gunn diode? Figure (a) Figure (b) Figure (c) Figure (d) HintThe Gunn diodes have high bandwidth and they are highly reliable98). Which one of the following very small energy gap? Conductors Semiconductors Insulators None of the above HintThe energy gap is moderate in semiconductors and high in insulators99). Which one of the following is an example of ohmic conductors? Metals Copper wires Silver All of the above HintThe diodes are non-ohmic conductors, so PN junction diode is non-ohmic conductor100). Which one of the following diodes is used for TV receivers and tuning diodes? Signal diode Zener diode Varactor diode None of the above HintThe signal diode is used for HF rectification, detection, and Zener diode is used for voltage reference Read more about Varactor DiodesRelated MCQsSemiconductor Diode Questions & Answers Please fill in the comment box below. Time is Up! Time's up
