FET (Field Effect Transistor) Question & Answers September 1, 2021 By Wat Electrical Leave a Comment This article lists 100 FET(Field Effect Transistor) MCQs for Engineering Students. All the FET(Field Effect Transistor) Questions & Answers given below includes solution and link wherever possible to the relevant topic. FET stands for Field Effect Transistor, came in practicality by the scientist Julius Edgar in 1925. It is a semiconducting device designed with three main terminals. These terminals include the source (input), gate, and drain (output). The main purpose of the design of FET is to control the voltage range between input and output terminals. FET is called a unipolar type transistor; as it is designed with either of majority charge carriers as holes or electrons hence it. It operates depending on the voltage applied on the gate terminal in three regions namely active, non-linear, and saturation region. The charge carriers in FET flow from input to output terminal depending on the amount of voltage applied to the gate terminal. They are mainly classified as JFET and MOSFET. JFET is abbreviated as Junction FET, is a switch that operates on supplying gate terminal with reverse bias-based voltage, allowing charge to flow from source to drain. JFET is further classified as N-channel JFET and P-Channel JFET, where N-channel JFET is doped with P-type and P-channel JFET is doped with N-type impurities. The major difference between 2 JFETs is, p-channel JFET has very small transconductance, and an N-channel JFET has low noise at its input. Whereas a MOSFET is a p or an n-type metal oxide type transistor containing an insulating type layer that provides high based input type impedance. They are further classified depending on the region of operation as enhancement type mode MOSFET and depletion mode type MOSFET. CMOS is an advanced version of MOSFET. FET’s are further available in many classes based on the insulation method used and their specific application purpose such as DGMOSFET, IGBT, BioFET, FREDFET, etc. The advantage of FET is, it consumes less power, BJT has low power, and gate-to-drain current is high. FET’s are used in vast fields of applications from memory chips to electric motors. 1). A FET is made of _______ substance. Conducting Insulating Semi conducting Both a and b Hint 2). A FET is a class of ________. Switch Diode Transistor Battery Hint 3). Current direction in FET is controlled using ______ field. Magnetic Electric EM All the above Hint 4). A FET has _______ number if terminals. 2 3 4 5 Hint 5). A FET is ______ polar type transistor. Bi Uni Tri Multi Hint 6). How many charge carriers do a FET consist of? Holes Electrons Neutrons Both a or b Hint 7). What is the value of input impedance of FET, at minimum frequency? High Low Moderate Infinity Hint 8). Which of the following scientist invented JFET? Heinrich Welker Oskar Hell William Shockley Julius Edgar Hint 9). Which of the following type of FET was built first? MOSFET JFET MESFET Polysilicon FET Hint 10). Which of the following component of FET allows charge carriers to flow from input to output? Gate Source Drain Channel Hint 11). Which of the following component of FET allows charge carriers to enter into FET channel? Gate Source Drain Channel Hint 12). Which of the following component of FET allows charge carriers to exit from FET channel? Gate Source Drain Channel Hint 13). Which of the following component of FET modulates conductivity of channel? Gate Source Drain Channel Hint 14). Which of the following terminals in FET are with ohmic contacts? Gate Source Drain Both b and c Hint 15). Which of the following is the 4th terminal of a FET device? Source Channel Drain Substrate Hint 16). Which of the following component of FET is responsible for allowing FET to initiate conduction? Source Gate Channel Substrate Hint 17). Which of the following is the function of a Gate terminal? Allows electrons to pass Blocks electrons to pass Controls gate physically opening and closing All the above Hint 18). In which of the major portion do components of FET lie? Source Drain Gate Substrate Hint 19). Which of the following carrier type voltage in n-channel FET cause depletion region to expand? Positive Negative Neutral None of the above Hint 20). What happens to channel’s resistance in n-channel FET, when active based region expands in order to short channel? Large Small Moderate Zero Hint 21). The condition at which a FET is turned off is called ______. Pinch-off Discard Conducting Short circuited Hint 22). Which of the following polarity in NFET is applied to gate to source to allow easy flow of charge carriers? Negative Positive Neutral Both a and c Hint Read more about Polarity. 23). Which of the following component of NFET is absent during enhancement type mode? Source Gate Drain Channel Hint 24). Which of the following type of FET is used as a switch? NFET PFET MSFET JFET Hint 25). JFET are classified into how many types? 2 3 4 1 Hint Field Effect Transistors MCQs for Interviews 26). Which of the following is doped in N-channel JFET? N type P-type NP-type PN-type Hint 27). Which of the following is the term used for specifying the potential between source and drain of N-type JFET? Vdd Vgs Vcc V Hint 28). Which of the following is the term used for specifying the potential between source and gate of N-type JFET? Vdd Vgs Vcc V Hint 29). What is the direction of flow of charge when positive polarity is given to source and drain terminals? Source to drain Drain to source Source to gate Drain to gate Hint 30). What is the direction when conventional drain based current is applied to NFET? Drain to source Source to gate Drain to gate Source to drain Hint 31). What is the width of the channel of NFET on applying negative polarity to gate? Increases Reduces Remains same Both a and b Hint 32). What happen to resistance of drain and source of NFET when channel width reduces? Increases Reduces Remains same Both a and b Hint Read more about Resistance. 33). Which of the following channel of JFET provides higher conductivity? P channel N channel PN channel NP channel Hint Read more about Conductivity. 34). Which of the following is doped in P-channel JFET? N type P-type NP-type PN-type Hint 35). Which of the following are the charge carriers of P-channel NFET? Holes Electrons Neutrons Both a and b Hint 36). Which type of polarity is applied to source-drain of P-type NFET to allow current to pass from source to drain? Positive Negative Both a and b Zero Hint 37). On applying which polarity to NFET gate terminal the channel size reduces? Positive Negative Both a and b Zero Hint 38). How much positive type voltage is applied to gate of NFET allows less current to flow in NFET? High Low Zero Constant Hint 39). What is the voltage value of drain to source on comparing with gate to source value in FET? Less More Zero Infinity Hint 40). When a FET functions like a variable type resistor then the FET is operating in ____ mode. Linear Non linear Ohmic Both a and c Hint Read more about Variable Resistor. 41). In which of the following mode do FET operates, when voltage between drain to source in increased beyond pinch-off point? Saturated mode Unsaturated mode Linear mode Cutoff mode Hint 42). Saturation mode is also called as ________. Linear mode Cutoff mode Active mode Inactive mode Hint 43). In which of the following region is drain current with respect to drain voltage are equal? Linear mode Cutoff mode Active mode Inactive mode Hint 44). In which of the following mode does FET acts as constant current type source? Linear mode Cutoff mode Active mode Inactive mode Hint 45). Which of the following is the most used substance during the fabrication of a FET? Silicon Germanium Graphite Diamond Hint 46). Which of the following substances are used during the manufacturing of OFET? SiC GaAs InGaAs All the above Hint 47). When FET channel is doped with n-type impurities, the source and drain are doped with ____ type of carriers. N-type P-type Np-type Both a and b Hint 48). When FET channel is doped with p-type impurities, the source and drain are doped with ____ type of carriers. N-type P-type Np-type Both a and b Hint 49). Which of the following is the insulator used in Mosfet? Silicon Germanium Gallium Silicon dioxide Hint 50). What is the abbreviation of MOSFET? Metal oxide semiconductor field effect transistor Metal order semiconductor field effect transistor Metal oxide semi-constant field effect transistor Metal oxide semiconductor Far effect transistor Hint 51). Which of the following are the examples of MOSFET? DGMOSFET DGMOS PFET Both a and b Hint 52). What is the full form of IGBT FET? Insulated gate bi-positive type transistor Insulated gate bipolar type terminator Insulated gate bipolar type terminal Insulated gate bipolar type transistor Hint 53). What is the function of IGBT device? Power controlling Resistance provider Current source Voltage source Hint 54). What is the range of voltage provided by IGBT to drain to source terminals? 200 - 300V 100-200V 400-500V 500 – 1000V Hint 55). What is the voltage range provided by power type MOSFET to drain to source? 1 – 200V 1000-2000V 400-500V 500 – 1000V Hint Field Effect Transistors Exam Questions & Answers 56). MNOS stands for ________. Metal Neon oxide semiconductor based transistor Metal nitride oxide semiconductor based thyristor Metal nitride oxide semiconductor based triode Metal nitride oxide semiconductor based transistor Hint 57). Which of the following substance is used in MNOS between body and gate? Conductor Insulator Semiconductor All the above Hint 58). ISFET stands for ________. Ion-sensitive FET Ion-silicon FET Ion-service FET Ion-segmented FET Hint 59). Which of the following type of FET is used for measuring ion type concentration of a solution? ISFET MNOS IGBT DGMOSFET Hint 60). Which of the following type of FET is used for detecting charged based molecules in transistor? BioFET MNOS PMOSFET IGBT Hint 61). Which of the following are types of bio type FET? Gene modified FET Cell type Bio FET Enzyme based modified FET All the above Hint 62). Which of the following bio sensor FET is used for detecting matched DNA? DNAFET EnFET ImmunoFET CPFET Hint 63). Which of the following is an example of JFET? Static type induction transistor Dynamic type induction transistor Induction type transistor Both a and b Hint 64). Which of the following are the characteristics of DEPFET? Image sensor Memory node Amplifier All the above Hint 65). Which of the following are the characteristics of FREDFET? Used in Electric motors Drives inductive type load Provide quick recovery All the above Hint 66). What is the abbreviation of HIGFET? Hetero structure insulated gate type FET Hypo structure insulated gate type FET High structure insulated gate type FET Hetero structure iso gate type FET Hint 67). What is modulation based doped FET also called? High electro type mobility transistor Low electro type mobility transistor Bio sensor transistor Both a and b Hint 68). A Tunnel based FET works on _______ tunneling type. Band to band Band to fermi Band to conduction None of the above Hint 69). High electron based mobility type transistor is also called _______. Hetero-structure FET Hypo FET Semi hetro FET All the above Hint 70). Which of the following substance is used in HEMT FET? AIGaAS Ga GaAS AI Hint 71). Which of the following type FET is used to substitute pn type junction of JFET along with Schottky barrier? MESFET HEMT FET MODFET All the above Hint 72). Which of the following substance is used in MESFET? GaAS As Ga All the above Hint 73). Which of the following is a memory based FET? NOMFET VeSFET CNTFET MEDFET Hint 74). Which of the following DET uses graphene Nano type ribbon in its channel? NOMFET GNRFET CNTFET MEDFET Hint 75). Which of the following type of FET has a non volatile based memory? Fe FET CNTFET MEDFET GFET Hint Field Effect Transistors MCQs With Answers 76). Which of the following are the advantages of FET? Gate to drain current is high BJT has low noise Consumes less power All the above Hint 77). Which of the following are the disadvantages of FET? Low gain-bandwidth based product Low resistance Experiences tradeoff between switching speed and pd All the above Hint 78). Which of the following region defines when drain based source voltage hits low voltage value? Saturation region Break down region Ohmic region Cutoff region Hint 79). Which of the following is the purpose of Mosfet? Amplification Switching Collecting Both a and b Hint 80). MOSFET are classified into ______ types. 2 3 4 5 Hint 81). In which of the following type of FET gate is separately powered? FGMOS IGFET MISFET All the above Hint 82). Which of the following is the application of FGMOS? Memory cell Flash memory EEPROM All the above Hint 83). Which of the following are the applications of power type MOSFET? High power type PA systems High end type audio amplifiers Medical purpose Both a and b Hint 84). Which of the following are the advantages of power type MOSFET? Better switching capacity Low gate based drive power Enhance behavior in active region All the above Hint 85). Which of the following technology is used in power type MOSFET? VDMOS LDMOS CDMOS Both a and b Hint 86). How many P-N junctions does MOS capacitor have? 1 3 2 4 Hint 87). Which of the following is the application of MOS capacitor? Storage Memory CCD All the above Hint 88). Who invented TFT? Paul K William.H J. Henry Charles Hint 89). Which of the following is the application of TDT FET? Memory LCD Battery All the above Hint 90). Which of the following are the components of BICMOS? BJT CMOS NMOS Both a and b Hint 91). Which of the following is a power type transistor? IGBT NMOS CMOS PMOS Hint 92). IGBT is designed using ________. BJT MOSFET NMOS Both a and b Hint 93). Which of the following transistor type is used in digital imaging application? CCD CMOS BJT Both a and b Hint 94). Which of the following is the configuration of dual based gate MOSFET? Tetrode Bilateral Unilateral None of the above Hint 95). Which of the following are the applications of dual based gate MOSFET? Radio frequency with small signal RF circuits Vacuum tubes All the above Hint 96). How many gates does a FinFET have? 1 2 3 4 Hint 97). Which of the following type of FET is a 3D based transistor? FinFET GAAFET DGMOS FlexFET Hint 98). Which of the following transistor type has three gates? GAAFET DGMOS FlexFET Trigate transistor Hint 99). What is the speed percent of a tri-gate type transistor used in Intel? 37% 40% 33% 50% Hint 100). How many gates does GAAFET have? 2 3 4 Both a and c Hint Time is Up! Time's up
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