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Semiconductor Diode Question & Answers

September 13, 2021 By Wat Electrical Leave a Comment

This article lists 100 Semiconductor Diode MCQs for engineering students. All the Semiconductor Diode Questions & Answers given below includes solution and link wherever possible to the relevant topic.

The intrinsic and extrinsic are the two types of semiconductors, the N-type and the P-type are two types of extrinsic semiconductors. When we join P and N-type semiconductors together, the PN-junction will form at the border.

The free electrons are majority carriers and holes are minority carriers in an N-type semiconductor whereas the free electrons are minority carriers and holes are majority carriers in a P-type semiconductor.

1). The varactor diode is also called a ___________
HintThe varactor diode is also called a varicap or tuning or parametric diode
Read more about Varactor Diode
2). Which one of the following diodes is also called a hot carrier diode?
HintThe Schottky diode is also called a hot carrier diode
3). What are the advantages of C-filter?
HintThe advantages of C-filter are low cost, it has good characteristics, and small in size
4). Which one of the following is a semiconductor material?
HintThe germanium, carbon, silicon are few semiconductor materials
5). Which one of the following is a majority current carrier in N-type semiconductors?
HintThe free electrons are the majority current carriers in N-type semiconductor
6). In which one of the following diode the electricity flows in one direction?
HintIn the PN junction diode the electricity flows in one direction
7). Which one of the following diodes is used for rectification?
HintThe PN junction diode is used for rectification
8). Which one of the following semiconductors is a pure semiconductor?
HintThe purity of intrinsic semiconductors is pure
9). The density of electrons in an intrinsic semiconductor is ____________ the density of holes
HintThe density of electrons in an intrinsic semiconductor is equal to the density of holes
10). The electrical conductivity in an intrinsic semiconductor is _______________
HintThe electrical conductivity in an intrinsic semiconductor is low
11). The ratio of minority and majority carriers in an extrinsic semiconductor is ____________
HintThe ratio of minority and majority carriers in an extrinsic semiconductor is not unity
12). Which one of the following has a low operating temperature?
HintAn intrinsic semiconductor has a low operating temperature
13). The acceptor impurities are used in ___________ type semiconductor
HintThe acceptor impurities are used in N-type semiconductor
14). _______________ are the examples of compound semiconductor
HintThe GaP, Cds, and GaAs are examples of compound semiconductor
15). _______________ are the pentavalent impurities
HintThe arsenic, antimony, phosphorous are the pentavalent impurities
16). ______________ are the trivalent impurities
HintThe aluminum, boron, gallium, and indium are the trivalent impurities
17). How many valence electrons do trivalent impurities have?
HintThe trivalent impurities have three valence electrons
18). The threshold voltage/barrier potential of germanium diode is _______________
HintThe threshold voltage/barrier potential of germanium diode is 0.3 volts
19). The Zener diode is used for ______________
HintThe Zener diode is used for voltage regulation
Read more about Zener Diode
20). Which one of the following is a majority current carrier in P-type semiconductors?
HintThe holes are the majority current carrier in P-type semiconductors
21).The density of electrons in an extrinsic semiconductor is _______________ the density of holes
HintThe density of electrons in an extrinsic semiconductor is not equal to the density of holes
22). The electrical conductivity in an extrinsic semiconductor is _______________
HintThe electrical conductivity in an extrinsic semiconductor is high
23). The ratio of minority carriers in an intrinsic semiconductor is _______________
HintThe ratio of minority carriers in an intrinsic semiconductor is unity
24). The donor impurities are used in ______________ type semiconductor
HintThe donor impurities are used in P-type semiconductor
25). The current in ______________ region is infinite
HintThe current in the conduction region is infinite

Semiconductor Diode Important MCQs

26). The doped semiconductor materials are categorized into __________
HintThe doped semiconductor materials are categorized into two types they are N-type and P-type
27). ____________ are the diode operating conditions
HintThe no bias, forward bias, and reverse bias are the diode operating conditions
28). How many types of resistance are there?
HintThere are three types of resistances are there they are DC, AC, and average AC resistance
29). Which band contains valence electrons?
HintThe valence band contains valence electrons
30). Which band contains free electrons?
HintThe conduction band contains free electrons
31). Which one of the following separates conduction and valence band?
HintThe forbidden energy band separates conduction and valence band
32). In ____________ band no electrons exist
HintIn a forbidden band, no electrons exist
33).The forbidden gap measured in terms of _______________
HintThe forbidden gap measured in terms of electron volts
34). Based on the width of the forbidden gap the materials are categorized into __________ types
HintBased on the width of the forbidden gap the materials are categorized into three types they are insulators, semiconductors, and conductors
35). _____________ are the examples of conductor
HintThe metals, saltwater, etc are examples of conductor
36). _____________ are the examples of insulator
HintThe wood, paper, etc are examples of insulator
37). Which one of the following materials doesn’t conduct any current?
HintThe insulator doesn’t conduct any current
38). How many valance electrons do insulators have in their outermost orbit?
HintThe insulators have eight valance electrons in their outermost orbit
39). ___________ are formed due to ionic bonding
HintAn insulators are formed due to ionic bonding
40). In ___________ region the diode acts like open
HintIn non-conduction region the diode acts like open
41). The resistance is very high in ______________
HintThe resistance is very high in insulators
42). Which one of the following materials has a negative temperature coefficient?
HintThe conductors and semiconductor materials have a negative temperature coefficient
43). How many valence electrons do conductors have?
HintThe conductors have only one valence electron in their outermost orbit
44). In which one of the following materials the resistance is very small?
HintIn conductors the resistance is very small
45). The energy gap in semiconductors is from ________
HintThe energy gap in semiconductors is from 0.7 EV to 2 EV
46). The energy gap in conductors is from ________
HintThe energy gap in conductors is from 0.01 ev
47). _____________ are formed by covalent bonding
HintThe semiconductors are formed by covalent bonding
48). _____________ are formed by metallic bonding
HintThe conductors are formed by metallic bonding
49). The number of carriers at normal temperature is low in ____________
HintThe number of carriers at normal temperature is low in semiconductor
50). What is the standard form of TVS diode?
HintThe standard form of TVS diode is Transient Voltage Suppression

Semiconductor Diode MCQs with Hints

51). How many valence electrons do semiconductors have?
HintThe semiconductors have four valence electrons in their outermost orbit
52). The energy gap in insulators is from ________
HintThe energy gap in insulators is 5 ev
53). ______________ breakdown temperature coefficient is positive
HintIn avalanche diode the breakdown temperature coefficient is positive
54). The doping levels in conventional diode are _____________
HintThe doping levels in conventional diode are moderate
55). The cut-in voltage in conventional diode is ____________ for silicon
HintThe cut-in voltage in conventional diode is 0.6 to 0.7 volts for silicon
56). The cut-in voltage in tunnel diode is ____________
HintThe cut-in voltage in tunnel diode is 0.1 volts
57). Which one of the following diodes is introduced by Esaki?
HintThe tunnel diode is introduced by Esaki
58). The frequency range of the PN-junction diode is _________
HintThe frequency range of the PN-junction diode is up to 10MHz
59). The frequency range of the Schottky diode is _________
HintThe frequency range of the Schottky diode is more than 300MHz
60). The doping levels in tunnel diode are _____________
HintThe doping levels in tunnel diode are very high
61). Which one of the following breakdowns occurs in heavily doped diodes?
HintThe Zener breakdown occurs in heavily doped diodes
62). ___________ breakdown occurs at the low reverse bias voltages
HintThe Zener breakdown occurs at the low reverse bias voltages
63). The light-emitting diodes has _______________
HintThe light-emitting diodes has low efficiency, slow response time, and lower data transmission rate
64). The laser diodes has _______________
HintThe laser diodes have high efficiency, fast response time, and higher data transmission rate
65). Which one of the following provides less distortion?
HintThe laser diodes provide less distortion compares to LED
66). Which one of the following diodes works on the electro luminance principle?
HintThe light-emitting diode works on the electro luminance principle
67). Which one of the following diodes converts light energy into electrical energy?
HintThe photo-diode converts light energy into electrical energy
68). The biasing mode of LED is ____________
HintThe biasing mode of LED is forward only
69). How many PN junctions do crystal diodes have?
HintThe crystal diodes have only one PN junction
70). Which one of the following breakdowns occurs in lightly doped diodes?
HintThe avalanche breakdown occurs in lightly doped diodes
71). ___________ breakdown occurs at the high reverse bias voltages
HintThe avalanche breakdown occurs at the high reverse bias voltages
72). Which one of the following diodes works on the photoconduction principle?
HintThe photodiode works on the photoconduction principle
73). What are the applications of a photodiode?
HintThe photodiodes are used in consumer electronic devices, medical and scientific instruments, optical communication, etc.
74). ______________ diode is also known as surface barrier diode
HintThe Schottky diode is also known as surface barrier diode
75). Which one of the following diodes is also known as a transferred electron device?
HintThe Gunn diode is also known as transferred electron device

Semiconductor Diode MCQs for Exams

76). Which one of the following diodes is discovered by John Battiscombe Gunn?
HintThe Gunn diode is discovered by John Battiscombe Gunn
77). In how many modes does the PN junction works?
HintIn two modes PN junction works they are forward bias and reverse bias mode
78). What are the advantages of the PN junction diode?
HintThe advantages of the PN junction diode are it occupies less space, no filament is necessary, and it has a long life
79). What are the applications of the PN junction diode?
HintThe PN junction diode used as rectifiers, switch, and detectors, etc
80). The polyethylene is an example for ______________
HintThe polyethylene is an example of an insulator
81). Which one of the following diodes is discovered by Melvin Zener?
HintThe Zener diode is discovered by Melvin Zener
82). The copper or aluminum is an example for ______________
HintThe copper or aluminum is an example of the conductor
83). Which one of the following diodes produces voltage-dependent capacitor?
HintThe varactor diodes produces voltage-dependent capacitor
84). Which one of the following diodes is used for mixing and detection of microwave signals?
HintThe crystal and Schottky diodes both are used for mixing and detection of microwave signals
85). The PIN diodes are used for _____________
HintThe PIN diodes are used for switching, modulation, and also used for attenuation
86). The varactor diodes are used for _____________
HintThe varactor diodes are used for amplification, frequency multiplication, and tuning
87). Which one of the following diodes is used for oscillation?
HintThe Gunn and tunnel diodes both are used for oscillation
88). The peak inverse voltage of silicon diode is ______________
HintThe peak inverse voltage of silicon diode is 1000 volts
89). The threshold voltage/barrier potential of silicon diode is _______________
HintThe threshold voltage/barrier potential of silicon diode is 0.6 volts
90). The PIV of germanium diode is _______________ volts
HintThe PIV of germanium diode is 4000 volts
91). The forward voltage drop of germanium diode is ______________
HintThe forward voltage drop of germanium diode is 0.3 volts
92). How many types of photodiodes are there?
HintThe photodiodes are of two types they are PN and PIN photodiodes
93). In how many modes does photodiode works?
HintThe photodiodes works in two modes they are photoconductive mode, and photovoltaic mode
94). How many terminals does the silicon PIN diode consist of?
HintThe silicon PIN diode consists of two terminals
95). The breakdown voltage of silicon PIN diode is ___________
HintThe breakdown voltage of silicon PIN diode is 50 V
96). The lower frequency limit of silicon PIN diode is ___________
HintThe lower frequency limit of the silicon PIN diode is 10 MHz
97). The driver circuit complexity is _____________ in silicon PIN diode
HintThe driver circuit complexity is high in silicon PIN diode
98). The electrical resistivity of silicon is _____________
HintThe electrical resistivity of silicon is 1 ohm meter
99). The electrical resistivity of germanium is _____________
HintThe electrical resistivity of germanium is 10 ohm meter
100). The energy gap at zero degree kelvin in silicon is _____________
HintThe energy gap at zero degrees kelvin in silicon is 1.21 ev
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