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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?
HintIn schottky diode the cut-in voltage is small that is about 0.3 V
2). The forward current in schottky diode is due to ________________________?
HintThe forward current in PN diode is due to diffusion current
3). The switching speed is high in __________________________ diode?
HintThe switching speed is limited in the PN diode
4). Which one of the following diodes is used for rectification?
HintThe zener diode used for voltage regulation
5). The reverse current effect damage the junction in __________________ diode?
HintThe reverse current effect doesn't damage the junction in the Zener diode
6). In which one of the following diode the doping level is low?
HintThe doping level is high in the Zener junction diode
7). Which one of the following diodes doesn't obey ohms law?
HintThe PN junction diode obey ohms law
8). Which one of the following diodes uses three layers?
HintThe general purpose PN junction diode uses two layers
9). In which one of the following diodes does the forward resistance varies?
HintIn a general-purpose PN junction diode the forward resistance is constant
10). In which one of the following diodes the cut-in voltage is small?
HintIn PN junction diode the cut in voltage is large that is about 0.7 V
11). The forward current in PN diode is due to ________________________?
HintThe forward current in the Schottky diode is due to thermionic emission
12). The reverse current effect damage the junction in __________________ diode?
HintThe reverse current effect damage the junction in the PN junction diode
13). In which one of the following diode the doping level is high?
HintThe doping level is low in the PN junction diode
14). Which one of the following diodes doesn't obey ohms law?
HintThe Zener diode doesn't obey ohms law
15). Which one of the following diodes uses two layers?
HintThe PIN diode uses three layers
16). In which one of the following diode the forward resistance is constant?
HintIn PIN diode the forward resistance is varies
17). Which one of the following diodes can't be used for microwave applications?
HintThe PIN diode can be used for microwave application
18). How many types of biasing circuits are there?
HintThe self-bias and voltage divider bias are two types of biasing circuits
19). What are the important characteristics of JFET?
HintThe drain or VI and transfer characteristics are important characteristics of JFET
20). How many ways are there to control the channel width?
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 constant
21). What are the applications of the PN junction diode?
HintThe PN junction diode can be used as rectifiers, solar cells, photodiodes, etc
22). How many biasing conditions are there for the PN junction diode?
HintThe zero bias, forward bias, and reverse bias are the three biasing conditions for PN junction diode
23). Which one of the following diodes is used for HF rectification, detection?
HintThe Zener diode is used for voltage reference, PIN diode is used for RF switching diode
24). When the semiconductor is _____________________ the hall voltage is zero?
HintWhen the semiconductor is extrinsic the hall voltage is zero
25). The reverse bias PN junction capacitance increases when ________________________ decreased?
HintThe reverse bias PN junction capacitance increases when reverse bias decreased

PN Junction Diode MCQs for Quiz

26). Which one of the following diodes is used for power limiters?
HintThe power diode is not used for power limiter
27). What is the standard form of TVS?
HintTransient Voltage Suppression is one type of diode
28). What is the standard form of SBD?
HintThe Supper Barrier Diode is one type of rectifier diode
29). The supper barrier diode has _____________________________ forward voltage?
HintThe Supper Barrier Diode is one type of rectifier diode that has low forward voltage, fast switching capability, and less reverse leakage current
30). Which one of the following diodes is used for voltage reference?
HintThe signal diode is used for HF rectification, detection, PIN diode is used for RF switching diode
Read more about Zener Diodes
31). The solids based on the conductivity categorized into _________________________ types?
HintThe semiconductor, conductor, and insulator are the type of solids based on the conductivity
32). Which one of the following is an example for insulators?
HintSilicon and carbon are examples of semiconductors
33). Which one of the following is an example for semiconductors?
HintThe mica and rubber are examples of insulators
34). Which one of the following detects the gamma and x-ray photons?
HintThe attenuators used as shunt resistance and bridge in bridge T attenuator
35). Which one of the following is used for constant current source?
HintThe Zener diode is used for voltage reference, and the varactor diode is used for TV receivers and tuning diode
36). Which one of the following is used as shunt resistance and bridge in bridge T attenuator?
HintThe photodetectors detect the gamma and x-ray photons
37). Which one of the following has a large energy gap?
HintThe energy gap is moderate in semiconductors and very small in conductors
38). The maximum recurrent peak reverse voltage of IN4007 PN junction diode is around _________________________ volts?
HintThe maximum recurrent peak reverse voltage of IN4007 PN junction diode is around 1000 volts not more than 1000 volts
39). The maximum RMS voltage of IN4007 PN junction diode is around _________________________ volts?
HintThe maximum RMS voltage of the IN4007 PN junction diode is around 700 volts
40). Which one of the following diodes is used for RF switching diode?
HintThe signal diode is used for HF rectification, detection, Zener diode is used for voltage reference
41). In which one of the following the current flows easily?
HintOnly a little current can flow in semiconductor whereas in insulators no current flows
42). The maximum DC blocking voltage of IN4007 PN junction diode is around _________________________ volts?
HintThe maximum DC blocking voltage of IN4007 PN junction diode is around 1000 volts not more than 1000 volts
43). The average forward current of IN4007 PN junction diode is around _________________________ amperes?
HintThe average forward current of IN4007 PN junction diode is around 1.0 amperes
44). How many terminals does an IN4007 PN junction IC have?
HintThe cathode is a negatively charged terminal and the anode is a positively charged terminal
45). Which one of the following is a symbol for tunnel diode?
Diodes symbols
HintThe tunnel diodes are low cost, has high speed and low power
46). When the current flows from anode terminal to cathode terminal then the current is said to be ________________________ current?
HintWhen the current flows from cathode terminal to anode terminal then the current is said to be reverse current
47). The IN4007 PN junction diode IC has ________________________ forward voltage drop?
HintThe IN4007 PN junction diode IC has a low forward voltage drop and very high reverse peak voltage
48). In _________________________ the conductivity lies between insulator's and conductors?
HintCarbon, silicon, germanium, etc are examples of semiconductors
49). In which one of the following does the electricity can't pass?
HintThe electricity can pass easily in conductors
50). Which one of the following diodes is used for seven-segment displays?
HintThe signal diode is used for HF rectification, detection, Zener diode is used for voltage reference, and PIN diode is used for RF switching diode

PN Junction Diode MCQs for Interviews

51). In which one of the following only a little current flows?
HintOnly a little current can flow in semiconductor whereas in insulators no current flows
52). The peak forward surge current of IN4007 PN junction diode is around _________________________ amperes?
HintThe peak forward surge current of IN4007 PN junction diode is around 30 amperes not more than 30A
53). When the current flows from cathode terminal to anode terminal then the current is said to be ________________________ current?
HintWhen the current flows from anode terminal to cathode terminal then the current is said to be forward current
54). In which one of the following electricity can pass easily?
HintIn an insulator's electricity can't pass, the mica, rubber, etc are the examples of insulator's
55). Which one of the following diodes is used for high-frequency oscillators?
HintThe zener diode is used for voltage reference, and varactor diode is used for TV receivers and tuning diode
56). The supper barrier diode has _____________________________ reverse leakage current?
HintThe Supper Barrier Diode is one type of rectifier diode that has low forward voltage, fast switching capability, and low forward voltage
57). Which one of the following diodes is also known as Cat Whisker diode?
HintThe point diode is also known as crystal diode or Cat Whisker diode
58). How many layers does Shockley diode consist of?
HintThe shockley is a type of PNPN diode
59). The reverse breakdown voltage is ________________________ in Schottky diode?
HintThe reverse breakdown voltage is low in the Schottky diode and the reverse leakage current is high
60). Which one of the following diodes is used for light detection?
HintThe signal diode is used for HF rectification, detection, and the zener diode is used for voltage reference
61). Which one of the following is a symbol for junction diode?
Diodes symbols
HintThe pros of junction diode is it occupies less space in circuits
62). In which one of the following no current flows?
HintOnly a little current can flow in semiconductors whereas in insulators no current flows
63). The maximum instantaneous forward voltage of IN4007 PN junction diode is around _________________________ volts?
HintThe maximum instantaneous forward voltage of IN4007 PN junction diode is around 1.0 volts
64). The typical junction capacitance of IN4007 PN junction diode is around _________________________ PF?
HintThe typical junction capacitance of the IN4007 PN junction diode is around 15 PF not more than 15PF
65). Which one of the following diodes is used for reading, writing CD, DVD, etc?
HintThe Zener diode is used for voltage reference, and the varactor diode is used for TV receivers and tuning diode
66). Which one of the following moderate energy gaps?
HintThe energy gap is very small in conductors and high in insulators
67). The typical reverse recovery time of IN4007 PN junction diode is around _________________________ us?
HintThe typical reverse recovery time of IN4007 PN junction diode is around 2.0 us not more than 2 us
68). The operating temperature of IN4007 PN junction diode is around _________________________ centigrade?
HintThe operating temperature of IN4007 PN junction diode is around -55 ~150 degree centigrade
69). The photo diodes are categorized into ___________________________ types?
HintThe PN, PIN, Schottky, and avalanche are the type of photodiodes
70). Which one of the following is used for electrical isolation?
HintThe signal diode is used for HF rectification, detection, and zener diode is used for voltage reference
71). The reverse leakage current is ________________________ in Schottky diode?
HintThe reverse breakdown voltage is low in the Schottky diode and the reverse breakdown voltage is low
72). The IN4007 PN junction diode IC has ________________________ reverse peak voltage?
HintThe IN4007 PN junction diode IC has a low forward voltage drop and very high reverse peak voltage
73). Which one of the following bands contains conduction electrons?
HintThe valence band contains Valence electrons
74). The rate of radiative recombination divided by total rate of recombination is known as ___________________________ efficiency?
HintThe optical power output divided by electrical power output is known as external conversion efficiency
75). What are the advantages of the PN junction diode?
HintThe PN junction diodes are smaller, cheaper, strong, and not easily destroyed

PN Junction Diode MCQs for Exams

76). Which one of the following is a symbol for LDR?
Circuits Symbols
HintThe light-dependent resistor is one type of an electronic component
77). What is the standard form of LDR?
HintThe Light Dependent Resistor is one type of an electronic component
78). Which one of the following is a symbol for the Zener diode?
Diodes symbols
HintThe Zener diodes are less expensive compared to other diodes
79). Which one of the following is used for very small signal rectification?
HintThe Zener diode is used for voltage reference, and the varactor diode is used for TV receivers and tuning diode
80). Which one of the following is used for VHF rectification?
HintThe signal diode is used for HF rectification, detection, and zener diode is used for voltage reference
81). The reverse leakage current is ________________________ in super barrier diodes?
HintThe reverse leakage current is low in super barrier diodes whereas in the Schottky diode the leakage current is high
82). What are the advantages of laser diodes?
HintThe PN, PIN, Schottky, and avalanche are the type of photodiodes
83). The current always enters through ___________________ pin?
HintThe current always exists through cathode pin
84). The power dissipation of IN4007 PN junction diode is around _____________ watts?
HintThe power dissipation of IN4007 PN junction diode is around three watts
85). The IN4007 PN junction diode IC has ______________ current carrying capability?
HintThe IN4007 PN junction diode IC has a low forward voltage drop and very high reverse peak voltage
86). Which one of the following bands contains valence electrons?
HintThe conduction band contains conduction electrons
87). The optical power output divided by electrical power output is known as _____________________ efficiency ?
HintThe rate of radiative recombination divided by the total rate of recombination is known as internal efficiency
88). Which one of the following is a symbol for Buzzer?
Circuits Symbols
HintThe buzzer is one type of voice device used in household appliances, in industries, in toys, etc
89). In which one of the following filter the voltage regulation is poor?
HintThe voltage regulation is moderate in L filter and goof in LC filter
90). Which one of the following is used for AC line spike protection?
HintThe signal diode is used for HF rectification, detection, and zener diode is used for voltage reference
91). The forward voltage is ________________________ in super barrier diodes?
HintThe reverse leakage current and the forward voltage is low in super barrier diodes
92). ___________________ are the biasing of PN junction semiconductor diode?
HintThe zero bias, forward bias, and reverse bias are the three types of PN junction semiconductor diode biasing conditions
Read more about Diodes
93). Which one of the following integrated circuits has transistors and diode?
HintThe film circuits have components like resistance and capacitors
94). Which one of the following circuits is a combination of film circuit and monolithic integrated circuit?
HintThe film circuits and monolithic integrated circuits has components like capacitors and resistance
95). The current always exists through ___________________ pin?
HintThe current always enters through an anode pin
96). Which one of the following is a symbol for thermistor?
Circuits Symbols
HintThe resistance of the thermistor depends on the temperature
97). Which one of the following is a symbol for Gunn diode?
Diodes Symbols
HintThe Gunn diodes have high bandwidth and they are highly reliable
98). Which one of the following very small energy gap?
HintThe energy gap is moderate in semiconductors and high in insulators
99). Which one of the following is an example of ohmic conductors?
HintThe diodes are non-ohmic conductors, so PN junction diode is non-ohmic conductor
100). Which one of the following diodes is used for TV receivers and tuning diodes?
HintThe signal diode is used for HF rectification, detection, and Zener diode is used for voltage reference
Read more about Varactor Diodes

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