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 ___________ Varicap diode Tuning diode Parametric diode All of the above Hint Read more about Varactor Diode 2). Which one of the following diodes is also called a hot carrier diode? Schottky diode PN diode PIN diode None of the above Hint 3). What are the advantages of C-filter? Low-cost Good characteristics Small in size All of the above Hint 4). Which one of the following is a semiconductor material? Germanium Silicon Carbon All of the above Hint 5). Which one of the following is a majority current carrier in N-type semiconductors? Free electrons Holes Both a and b None of the above Hint 6). In which one of the following diode the electricity flows in one direction? P-N junction diode Zener diode Both a and b None of the above Hint 7). Which one of the following diodes is used for rectification? P-N junction diode Zener diode Both a and b None of the above Hint 8). Which one of the following semiconductors is a pure semiconductor? Intrinsic Extrinsic Both a and b None of the above Hint 9). The density of electrons in an intrinsic semiconductor is ____________ the density of holes Less than Equal to Greater than Not equal to Hint 10). The electrical conductivity in an intrinsic semiconductor is _______________ High Very high Low Medium Hint 11). The ratio of minority and majority carriers in an extrinsic semiconductor is ____________ Unity Not unity One Infinity Hint 12). Which one of the following has a low operating temperature? Intrinsic Extrinsic Both a and b None of the above Hint 13). The acceptor impurities are used in ___________ type semiconductor N-type P-type Both a and b None of the above Hint 14). _______________ are the examples of compound semiconductor GaP Cds GaAs All of the above Hint 15). _______________ are the pentavalent impurities Arsenic, antimony Phosphorous Bismuth All of the above Hint 16). ______________ are the trivalent impurities Aluminium, boron Gallium Indium All of the above Hint 17). How many valence electrons do trivalent impurities have? One Two Three Four Hint 18). The threshold voltage/barrier potential of germanium diode is _______________ 1 volts 0.3 volts 10 volts 100 volts Hint 19). The Zener diode is used for ______________ Rectification Voltage regulation Both a and b None of the above Hint Read more about Zener Diode 20). Which one of the following is a majority current carrier in P-type semiconductors? Free electrons Holes Both a and b None of the above Hint 21).The density of electrons in an extrinsic semiconductor is _______________ the density of holes Equal to Not equal to Greater than Less than Hint 22). The electrical conductivity in an extrinsic semiconductor is _______________ High Very low Low Better Hint 23). The ratio of minority carriers in an intrinsic semiconductor is _______________ One Two Unity Not unity Hint 24). The donor impurities are used in ______________ type semiconductor P-type N-type Both a and b None of the above Hint 25). The current in ______________ region is infinite Conduction Non-conduction Both a and b None of the above Hint Semiconductor Diode Important MCQs 26). The doped semiconductor materials are categorized into __________ One Two Three Four Hint 27). ____________ are the diode operating conditions No bias Forward bias Reverse bias All of the above Hint 28). How many types of resistance are there? One Two Three Four Hint 29). Which band contains valence electrons? Valance band Conduction band Forbidden None of the above Hint 30). Which band contains free electrons? Valance band Conduction band Forbidden None of the above Hint 31). Which one of the following separates conduction and valence band? Forbidden energy band Conductors Insulators All of the above Hint 32). In ____________ band no electrons exist Forbidden energy band Conductors Insulators All of the above Hint 33).The forbidden gap measured in terms of _______________ Amperes Ohms Electron volts None of the above Hint 34). Based on the width of the forbidden gap the materials are categorized into __________ types One Two Three Four Hint 35). _____________ are the examples of conductor Metals Saltwater Both a and b None of the above Hint 36). _____________ are the examples of insulator Wood, paper Saltwater, metals Ge, si, GaAs None of the above Hint 37). Which one of the following materials doesn’t conduct any current? Conductor Insulator Semiconductor All of the above Hint 38). How many valance electrons do insulators have in their outermost orbit? Two Four Eight Sixteen Hint 39). ___________ are formed due to ionic bonding Insulators Conductors Semiconductors All of the above Hint 40). In ___________ region the diode acts like open Conduction Non-conduction Both a and b None of the above Hint 41). The resistance is very high in ______________ Insulators Conductors Semiconductors All of the above Hint 42). Which one of the following materials has a negative temperature coefficient? Insulators Conductors Semiconductors Both b and c Hint 43). How many valence electrons do conductors have? One Two Three Four Hint 44). In which one of the following materials the resistance is very small? Insulators Conductors Semiconductors None of the above Hint 45). The energy gap in semiconductors is from ________ 1 ev to 10 ev 0.7 ev to 2 ev 1 ev to 20 ev 1 ev to 100 ev Hint 46). The energy gap in conductors is from ________ 0.01 ev 0.7 ev to 2 ev 1 ev to 20 ev 1 ev to 100 ev Hint 47). _____________ are formed by covalent bonding Insulators Conductors Semiconductors None of the above Hint 48). _____________ are formed by metallic bonding Insulators Conductors Semiconductors None of the above Hint 49). The number of carriers at normal temperature is low in ____________ Insulators Conductors Semiconductors None of the above Hint 50). What is the standard form of TVS diode? Transient Voltage Suppression Transparent Voltage Suppression Transistor Voltage Suppression None of the above Hint Semiconductor Diode MCQs with Hints 51). How many valence electrons do semiconductors have? One Two Three Four Hint 52). The energy gap in insulators is from ________ 1 ev to 10 ev 0.7 ev to 2 ev 5 ev 1 ev to 100 ev Hint 53). ______________ breakdown temperature coefficient is positive Avalanche Zener Both a and b None of the above Hint 54). The doping levels in conventional diode are _____________ Very high High Very low Moderate Hint 55). The cut-in voltage in conventional diode is ____________ for silicon 0.6 to 0.7 volts 1 to 2 volts 10 to 20 volts 1 to 25 volts Hint 56). The cut-in voltage in tunnel diode is ____________ 0.1 volts 1 to 2 volts 10 to 20 volts 1 to 25 volts Hint 57). Which one of the following diodes is introduced by Esaki? Varactor diode PN diode Laser diode Tunnel diode Hint 58). The frequency range of the PN-junction diode is _________ Up to 1MHz Up to 2MHz Up to 5MHz Up to 10MHz Hint 59). The frequency range of the Schottky diode is _________ Up to 1MHz Up to 25MHz Up to 100MHz Up to 300MHz Hint 60). The doping levels in tunnel diode are _____________ Very high High Very low Moderate Hint 61). Which one of the following breakdowns occurs in heavily doped diodes? Zener Avalanche Both a and b None of the above Hint 62). ___________ breakdown occurs at the low reverse bias voltages Zener Avalanche Both a and b None of the above Hint 63). The light-emitting diodes has _______________ Low efficiency Slow response time Lower data transmission rate All of the above Hint 64). The laser diodes has _______________ High efficiency Fast response time Higher data transmission rat All of the above Hint 65). Which one of the following provides less distortion? LED Laser diode Both a and b None of the above Hint 66). Which one of the following diodes works on the electro luminance principle? LED Photo-diode Both a and b None of the above Hint 67). Which one of the following diodes converts light energy into electrical energy? LED Photo-diode Both a and b None of the above Hint 68). The biasing mode of LED is ____________ Only forward Only reverse Either forward or revere None of the above Hint 69). How many PN junctions do crystal diodes have? One Two Three Four Hint 70). Which one of the following breakdowns occurs in lightly doped diodes? Zener Avalanche Both a and b None of the above Hint 71). ___________ breakdown occurs at the high reverse bias voltages Zener Avalanche Both a and b None of the above Hint 72). Which one of the following diodes works on the photoconduction principle? LED Photodiode Both a and b None of the above Hint 73). What are the applications of a photodiode? Used in consumer electronic devices Used in medical and scientific instruments Optical communication All of the above Hint 74). ______________ diode is also known as surface barrier diode Schottky diode Zener Avalanche None of the above Hint 75). Which one of the following diodes is also known as a transferred electron device? Schottky diode Zener Avalanche Gunn Hint Semiconductor Diode MCQs for Exams 76). Which one of the following diodes is discovered by John Battiscombe Gunn? Schottky diode Zener Avalanche Gunn Hint 77). In how many modes does the PN junction works? One Two Three Four Hint 78). What are the advantages of the PN junction diode? Occupies lesser space No filament is necessary Long life All of the above Hint 79). What are the applications of the PN junction diode? Rectifiers Switch Detectors All of the above Hint 80). The polyethylene is an example for ______________ Insulator Conductor Semiconductor None of the above Hint 81). Which one of the following diodes is discovered by Melvin Zener? Schottky diode Zener Avalanche Gunn Hint 82). The copper or aluminum is an example for ______________ Insulator Conductor Semiconductor None of the above Hint 83). Which one of the following diodes produces voltage-dependent capacitor? Varactor Tunnel Zener All of the above Hint 84). Which one of the following diodes is used for mixing and detection of microwave signals? Crystal Schottky Both a and b None of the above Hint 85). The PIN diodes are used for _____________ Switching Modulation Attenuation All of the above Hint 86). The varactor diodes are used for _____________ Amplification Frequency multiplication Tuning All of the above Hint 87). Which one of the following diodes is used for oscillation? Tunnel Gunn Both a and b None of the above Hint 88). The peak inverse voltage of silicon diode is ______________ 10 volts 50 volts 100 volts 1000 volts Hint 89). The threshold voltage/barrier potential of silicon diode is _______________ 1 volts 0.6 volts 10 volts 100 volts Hint 90). The PIV of germanium diode is _______________ volts 1000 volts 2000 volts 3000 volts 4000 volts Hint 91). The forward voltage drop of germanium diode is ______________ 0.1 volts 0.0001 volts 0.3 volts 10 volts Hint 92). How many types of photodiodes are there? One Two Three Four Hint 93). In how many modes does photodiode works? One Two Three Four Hint 94). How many terminals does the silicon PIN diode consist of? One Two Three Four Hint 95). The breakdown voltage of silicon PIN diode is ___________ 10 V 20 V 30 V 50 V Hint 96). The lower frequency limit of silicon PIN diode is ___________ 1 MHz 2 MHz 5 MHz 10 MHz Hint 97). The driver circuit complexity is _____________ in silicon PIN diode Very low Low High Moderate Hint 98). The electrical resistivity of silicon is _____________ 1 ohm meter 2 ohm meter 3 ohm meter 5 ohm meter Hint 99). The electrical resistivity of germanium is _____________ 10 ohm meter 2 ohm meter 3 ohm meter 5 ohm meter Hint 100). The energy gap at zero degree kelvin in silicon is _____________ 3.8ev 1.21ev 6.7ev 4.5ev Hint Time is Up! Time's up
Leave a Reply