PN Junction Diode Question & Answers February 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 None Hint 2). The forward current in schottky diode is due to ________________________? Thermionic emission Diffusion current Both a and b None of the above None Hint 3). The switching speed is high in __________________________ diode? Schottky diode PN diode Both a and b None of the above None Hint 4). Which one of the following diodes is used for rectification? Zener diode PN junction diode Both a and b None of the above None Hint 5). The reverse current effect damage the junction in __________________ diode? Zener diode PN junction diode Both a and b None of the above None Hint 6). 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 None Hint 7). Which one of the following diodes doesn't obey ohms law? Zener diode PN junction diode Both a and b None of the above None Hint 8). Which one of the following diodes uses three layers? PIN diode Both a and b General purpose PN junction diode None of the above None Hint 9). 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 None Hint 10). 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 None Hint 11). The forward current in PN diode is due to ________________________? Thermionic emission Diffusion current Both a and b None of the above None Hint 12). The reverse current effect damage the junction in __________________ diode? Zener diode PN junction diode Both a and b None of the above None Hint 13). 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 None Hint 14). Which one of the following diodes doesn't obey ohms law? Zener diode PN junction diode Both a and b None of the above None Hint 15). Which one of the following diodes uses two layers? PIN diode General purpose PN junction diode Both a and b None of the above None Hint 16). 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 None Hint 17). 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 None Hint 18). How many types of biasing circuits are there? One Two Three Four None Hint 19). What are the important characteristics of JFET? Drain and VI Transfer Both a and b None of the above None Hint 20). How many ways are there to control the channel width? One Two Three Four None Hint 21). 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 None Hint 22). How many biasing conditions are there for the PN junction diode? One Two Three Four None Hint 23). Which one of the following diodes is used for HF rectification, detection? Signal diode Zener diode PIN diode None of the above None Hint 24). When the semiconductor is _____________________ the hall voltage is zero? Extrinsic Intrinsic Both a and b None of the above None Hint 25). The reverse bias PN junction capacitance increases when ________________________ decreased? Reverse bias Forward bias Both a and b None of the above None Hint PN Junction Diode MCQs for Quiz 26). Which one of the following diodes is used for power limiters? PIN Power Both a and b None of the above None Hint 27). What is the standard form of TVS? Transistor Voltage Suppression Transformer Voltage Suppression Transient Voltage Suppression None of the above None Hint 28). What is the standard form of SBD? Supper Barrier Diode Surface Barrier Diode Suppression Barrier Diode None of the above None Hint 29). The supper barrier diode has _____________________________ forward voltage? Low High Very high Moderate None Hint 30). Which one of the following diodes is used for voltage reference? Signal diode Zener diode PIN diode None of the above None Hint Read more about Zener Diodes 31). The solids based on the conductivity categorized into _________________________ types? Two Three Four Six None Hint 32). Which one of the following is an example for insulators? Mica Silicon Carbon None of the above None Hint 33). Which one of the following is an example for semiconductors? Mica Rubber Carbon None of the above None Hint 34). Which one of the following detects the gamma and x-ray photons? Photodetector Attenuators RF switches None of the above None Hint 35). Which one of the following is used for constant current source? Current regulator Zener diode Varactor diode None of the above None Hint 36). Which one of the following is used as shunt resistance and bridge in bridge T attenuator? Photodetector Attenuators RF switches None of the above None Hint 37). Which one of the following has a large energy gap? Conductors Semiconductors Insulators None of the above None Hint 38). The maximum recurrent peak reverse voltage of IN4007 PN junction diode is around _________________________ volts? 1000V 2000V 160V None of the above None Hint 39). The maximum RMS voltage of IN4007 PN junction diode is around _________________________ volts? 1000V 2000V 700V None of the above None Hint 40). Which one of the following diodes is used for RF switching diode? Signal diode Zener diode PIN diode None of the above None Hint 41). In which one of the following the current flows easily? Conductors Semiconductors Insulators None of the above None Hint 42). The maximum DC blocking voltage of IN4007 PN junction diode is around _________________________ volts? 1000V 2000V 700V None of the above None Hint 43). The average forward current of IN4007 PN junction diode is around _________________________ amperes? 1000A 2000A 1.0A None of the above None Hint 44). How many terminals does an IN4007 PN junction IC have? One Two Three Four None Hint 45). Which one of the following is a symbol for tunnel diode? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 46). 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 None Hint 47). The IN4007 PN junction diode IC has ________________________ forward voltage drop? High Low Very high Moderate None Hint 48). In _________________________ the conductivity lies between insulator's and conductors? Insulator's Semiconductors Both a and b None of the above None Hint 49). In which one of the following does the electricity can't pass? Insulator's Semiconductors Conductors None of the above None Hint 50). Which one of the following diodes is used for seven-segment displays? Signal diode Zener diode PIN diode LED None Hint PN Junction Diode MCQs for Interviews 51). In which one of the following only a little current flows? Conductors Semiconductors Insulators None of the above None Hint 52). The peak forward surge current of IN4007 PN junction diode is around _________________________ amperes? 1000A 2000A 30A None of the above None Hint 53). 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 None Hint 54). In which one of the following electricity can pass easily? Insulator's Semiconductors Conductors None of the above None Hint 55). Which one of the following diodes is used for high-frequency oscillators? Tunnel diode Zener diode Varactor diode None of the above None Hint 56). The supper barrier diode has _____________________________ reverse leakage current? Low High Very high Moderate None Hint 57). Which one of the following diodes is also known as Cat Whisker diode? Point Schottky Rectifier None of the above None Hint 58). How many layers does Shockley diode consist of? Two Four Six None of the above None Hint 59). The reverse breakdown voltage is ________________________ in Schottky diode? High Low Very high Moderate None Hint 60). Which one of the following diodes is used for light detection? Signal diode Zener diode Photodiode None of the above None Hint 61). Which one of the following is a symbol for junction diode? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 62). In which one of the following no current flows? Conductors Semiconductors Insulators None of the above None Hint 63). The maximum instantaneous forward voltage of IN4007 PN junction diode is around _________________________ volts? 1.0V 2V 3V None of the above None Hint 64). The typical junction capacitance of IN4007 PN junction diode is around _________________________ PF? 60 40 15 None of the above None Hint 65). Which one of the following diodes is used for reading, writing CD, DVD, etc? Laser diode Zener diode Varactor diode None of the above None Hint 66). Which one of the following moderate energy gaps? Conductors Semiconductors Insulators None of the above None Hint 67). The typical reverse recovery time of IN4007 PN junction diode is around _________________________ us? 2.0 40 15 None of the above None Hint 68). The operating temperature of IN4007 PN junction diode is around _________________________ centigrade? -1 ~150 degree -5 ~150 degree -55 ~150 degree None of the above None Hint 69). The photo diodes are categorized into ___________________________ types? Two Three Four Five None Hint 70). Which one of the following is used for electrical isolation? Signal diode Zener diode Optocoupler None of the above None Hint 71). The reverse leakage current is ________________________ in Schottky diode? High Low Very high Moderate None Hint 72). The IN4007 PN junction diode IC has ________________________ reverse peak voltage? High Low Very high Moderate None Hint 73). Which one of the following bands contains conduction electrons? Valence Forbidden Conduction None of the above None Hint 74). 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 None Hint 75). What are the advantages of the PN junction diode? Smaller Cheaper Strong and not easily destroyed All of the above None Hint PN Junction Diode MCQs for Exams 76). Which one of the following is a symbol for LDR? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 77). What is the standard form of LDR? Light Diode Resistor Light Dependent Resistor Light Diffusion Resistor None of the above None Hint 78). Which one of the following is a symbol for the Zener diode? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 79). Which one of the following is used for very small signal rectification? Back diode Zener diode Varactor diode None of the above None Hint 80). Which one of the following is used for VHF rectification? Signal diode Zener diode Schottky diode None of the above None Hint 81). The reverse leakage current is ________________________ in super barrier diodes? High Low Very high Moderate None Hint 82). What are the advantages of laser diodes? Small in size Small in weight Has wide angle beam All of the above None Hint 83). The current always enters through ___________________ pin? Anode Cathode Both a and b None of the above None Hint 84). The power dissipation of IN4007 PN junction diode is around _____________ watts? One Two Three Four None Hint 85). The IN4007 PN junction diode IC has ______________ current carrying capability? High Low Very high Moderate None Hint 86). Which one of the following bands contains valence electrons? Valence Forbidden Conduction None of the above None Hint 87). The optical power output divided by electrical power output is known as _____________________ efficiency ? External quantum Internal quantum External conversion None of the above None Hint 88). Which one of the following is a symbol for Buzzer? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 89). In which one of the following filter the voltage regulation is poor? C filter L filter LC filter None of the above None Hint 90). Which one of the following is used for AC line spike protection? Signal diode Zener diode Varistor None of the above None Hint 91). The forward voltage is ________________________ in super barrier diodes? High Low Very high Moderate None Hint 92). ___________________ are the biasing of PN junction semiconductor diode? Zero bias Forward bias Reverse bias All of the above None Hint Read more about Diodes 93). Which one of the following integrated circuits has transistors and diode? Film Hybrid Monolithic None of the above None Hint 94). Which one of the following circuits is a combination of film circuit and monolithic integrated circuit? Film Hybrid Monolithic None of the above None Hint 95). The current always exists through ___________________ pin? Anode Cathode Both a and b None of the above None Hint 96). Which one of the following is a symbol for thermistor? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 97). Which one of the following is a symbol for Gunn diode? Figure (a) Figure (b) Figure (c) Figure (d) None Hint 98). Which one of the following very small energy gap? Conductors Semiconductors Insulators None of the above None Hint 99). Which one of the following is an example of ohmic conductors? Metals Copper wires Silver All of the above None Hint 100). Which one of the following diodes is used for TV receivers and tuning diodes? Signal diode Zener diode Varactor diode None of the above None Hint Read more about Varactor Diodes Related MCQs Semiconductor Diode Questions & Answers Please fill in the comment box below. Time's up
