Tunnel Diode Question & Answers February 9, 2022 By WatElectronics This article lists 100 Tunnel Diode MCQs for engineering students. All the Tunnel Diode Questions and Answers given below include a hint and a 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 Tunnel Diode. A Tunnel diode is a type of PN diode designed by Tokyo scientist Leo Esaki in 1958. During this discovery of diode, Leo has observed the heavily doping condition to diode has generated negative based resistance. This generation of negative-based resistance has further reduced the current flow across the diode. This diode works on the principle of Tunneling also called the Quantum mechanical effect and its characteristics are plotted using VI characteristics in forward and reverse bias conditions. VI characteristics operate in 3 regions tunneling current, negative resistance, and valley point. A heavy doping-based condition is observed in forward bias condition of the tunnel diode. In reverse bias conditions, the diode acts as a fast rectifier. These diodes benefit in terms of switching property, minimum noise, less power dissipation, and generation of negative resistance. But limits in terms of cost, zero isolation between input and output, low output swing, and low power devices. The applications include oscillators, amplifiers, storage devices, etc. 1). A tunnel diode is also called ____? Eskari diode PN diode Zener diode Pin diode Hint 2). A tunnel diode is a ____ diode? Semi-conductor diode Conducting diode Insulating diode Both a and b Hint Read more about Semiconductor. 3). A tunnel diode is similar to ____ diodes operation? PN diode Zener diode Vactor diode PIN diode Hint 4). A tunnel diode has _____ polarity resistance? Positive Negative Neutral Both a and b Hint 5). Due to _____ property tunnel diode experience tunneling? Quantum Mechanical Pressure Mechanical torque Both b and c Hint 6). Quantum mechanic is related to _____ subject? Maths Physics Mechanics Science Hint 7). Quantum physics includes _____? Quantum theory Quantum Chemistry Quantum information science All the above Hint 8). A semiconductor diode has ___ number of substances? 1 2 3 4 Hint 9). In negative resistance concept, increase in voltage of a device leads to _____ in current quantity? Increase Decrease Zero Constant Hint 10). Tunneling is a _____ phenomenon? Quantum Mechanical Quantum Physics Quantum Chemist Quantum Maths Hint 11). Tunnel diode was invented by ____ scientist? Leo Esaki Leo Tunnel James Esaki Both a and c Hint 12). Tunnel diode is a ___ device? Passive Active Source independent Both b and c Hint 13). Tunnel diode works on ___ principle? Tunneling Collision Expansion Both a and c Hint 14). Which of the following was the first production of tunneling diode? Sony Phillips Voltas LG Hint 15). How many pins do a tunnel diode comprises of? 1 2 3 4 Hint 16). Identify the following diode type in the figure below? Diode Zener diode Tunnel diode PIN diode Varactor diode Hint 17). A cathode is a ___ polarity? +ve –ve Inverted Both b and c Hint 18). A anode is a ___ polarity? +ve –ve Inverted Both b and c Hint 19). A tunnel diode has ____ doped PN junction? Lightly Heavily Moderately Zero Hint 20). A PN junction is also called_____ junction? Positive to negative Negative to positive Positive to positive Negative to negative Hint 21). A P-type semiconductor has ____ as majority carriers? Holes Electrons Neutrons Both a and c Hint 22). A N-type semiconductor has ____ as majority carriers? Holes Electrons Neutrons Both a and c Hint 23). A heavy doping in tunnel diode has ____ band? Broken band gap Conduction band Valance band Zero band Hint Read more about Band. 24). N-side in tunnel diode has ___ band? Broken band gap Conduction band Valance band Zero band Hint 25). P-side in tunnel diode has ___ band? Broken band gap Conduction band Valance band Zero band Hint Tunnel Diode Interview Questions and Answers 26). A band gap is a _____? Energy gap Zero energy gap Valance gap All the above Hint 27). Which of the following is the mid gap in an electron conduction? Conduction band Valance band Band gap All the above Hint 28). Which of the following substance are used in a semiconductor device? Silicon Germanium Gallium All the above Hint 29). Which of the following are the applications of tunnel diode? Oscillator Amplifier Switching circuits All the above Hint Read more about Switching Circuits. 30). The power output from a tunnel diode is ____? High Low Zero Infinite Hint 31). Which of the following device application of tunnel diode has step tunneling? MIIM diode Resonant tunneling diode RF diode All the above Hint 32). Which of the following application of tunnel diode has highest frequency of an solid based oscillator? MIIM diode Resonant tunneling diode RF diode All the above Hint 33). In forward bias of a tunnel diode the width of band is ____? Wider Thin Zero Both b and c Hint 34). In reverse bias of a tunnel diode the width of band is ____? Wider Thin Zero Both b and c Hint 35). At negative differential resistance the value of current _____? Increases Decreases Zero Infinity Hint 36). When ____ parameter increases beyond fixed transition point the tunnel diode conducts. Current Voltage Load Resistance Hint 37). A tunnel diode in reverse bias is called ____? Back diodes Backward diodes Negative diode Both a and b Hint 38). In tunnel diode reverse bias condition the diode acts as fast _____? Rectifier Amplifier Oscillator Both a and b Hint 39). Which of the following are the properties of Tunnel diode in reverse bias? Zero offset voltage Linearity of power Fast rectifier All the above Hint 40). Which of the following substance is mostly used in tunnel diode? Germanium Gallium Silicon Both b and c Hint 41). A high impurity based PN junction devices is called ____ diode? Tunnel diode Zener diode Vactor diode Pin diode Hint 42). Which of the following is the formula for tunnel diode phenomenon? P α exp(-A*E_b*W) P - exp(-A*E_b*W) P + exp(-A*E_b*W) P = exp(-A*E_b*W) Hint 43). A tunnel diode has ___ body? Ceramic Non-ceramic Plastic Both b and c Hint 44). Which of the following are the components of tunnel diode? Hermetically sealing based lid Tin dot Mesh screen All the above Hint 45). The tin-dot in tunnel diode is connected to ____ terminal? Anode Cathode Positive Both a and b Hint 46). The pellet component of tunnel diode is connected to ____? Anode Cathode Positive Both a and c Hint 47). How many bias modes are observed in a tunnel diode? 1 2 4 5 Hint 48). The characteristic operation of tunnel diode is _____ than tunnel diode? Same Zero Different Infinite Hint 49). At ____ bias condition tunnel diode acts as fast rectifier? Forward Reverse Positive Negative Hint Read more about Rectifier. 50). Which of the following state in tunnel diode empty states are present on ____ side aligned with filled states? P-side N-side PN-side NPN side Hint Tunnel Diode MCQs for Exams 51). Which of the following is the filled state in tunnel diode? P-side N-side PN-side NPN side Hint 52). Which of the following is the un-filled state in tunnel diode? P-side N-side PN-side NPN side Hint 53). In tunnel diode electrons tunnel through ____? Potential barrier Wall Charge carriers All the above Hint 54). A tunnel diode with high concentration is a good _____? Conductor Semiconductor Insulator Both a and b Hint Read more about Conductor. 55). A tunnel diode is represented using ____ characteristics? VI VR IR IVR Hint 56). Which of the following parameter is plotted on X-axis of tunnel diode characteristics? Voltage Current Resistance Inductance Hint 57). Which of the following parameter is plotted on Y-axis of tunnel diode characteristics? Voltage Current Resistance Inductance Hint 58). The forward resistance in tunnel diode is _____ value? Maximum Minimum Zero Infinity Hint 59). When voltage increases beyond peak based voltage the value of current _____? Increases Decreases Zero Constant Hint 60). How many points are observed in an tunnel diode? 1 2 3 4 Hint 61). Which of the following is the equation of current component in tunnel diode? It = Itun + I diode + I excess It = Itun - I diode + I excess It = Itun + I diode - I excess It = Itun - I diode - I excess Hint 62). Due to which of the following reason current in tunnel diode raises? Parasitic tunneling Increase in load Increase in voltage All the above Hint 63). Which of the following is the value of output voltage of tunnel diode? 0.1 to 0.5 0.5 0.4 0.3 Hint 64). ____ are the maximum values of tunnel diode? Peak voltage Peak Current Peak resistance Both a and b Hint 65). Which of the following voltage is maximum in tunnel diode? Cut in voltage Peak voltage Load voltage Both a and b Hint 66). _____ properties in tunnel diode is considered negligible? Excess current Diode current Load current Both a and b Hint 67). Which of the following is the minimum and maximum current equation of a diode? V=Vpeak V=o V= infinity All the above Hint 68). Which of the following is the equation of a tunnel diode with negative resistance of a small signal based value? Rn= Ro + (1-(m*(V/Vo)m)*exp(-(V/Vo)^m)/R0 = 0 Rn= Ro - (1-(m*(V/Vo)m)*exp(-(V/Vo)^m)/R0 = 0 Rn= Ro + (1-(m*(V/Vo)m)*exp(-(V/Vo)^m)/R0 = 0 Rn * Ro/(1-(m*(V/Vo)m)*exp(-(V/Vo)^m)/R0 = 0 Hint 69). Which of the following is the order of switching time of a tunnel diode? Nano seconds Pico seconds Micro seconds Both a and b Hint 70). Due to triple valued feature tunnel diode act as _____ device? Logic memory Register Switch Both a and b Hint 71). Which of the following conditions of a tunnel diode makes it work as a microwave oscillator? Small capacitance Small inductance Negative resistance All the above Hint 72). Which of the following is the frequency of microwave oscillator? 10GHz 11GHZ 10MHz 12MHz Hint 73). A tunnel diode with negative resistance acts as _____? Oscillator Switch Amplifier Rectifier Hint Read more about Oscillators. 74). Which of the following is the advantage of tunnel diode? Low cost Enhance speed Minimum power All the above Hint 75). Which of the following are the disadvantages of tunnel diode? Zero isolation property between input and output Operates between 0 and 1V Low swing in output voltage All the above Hint Tunnel Diode Quiz Questions and Answers. 76). What is the width of PN junction in tunnel diode? 5nm 10nm 15nm 20nm Hint 77). In ____ material tunneling is a incident based conduction? Conducting Semiconducting Insulating All the above Hint 78). In tunneling diode electrons flow in ___ region? Active Sat Depletion All the above Hint 79). The doping capacity of a tunnel diode is ___? 1000 Greater than 1000 Lesser than 1000 100 Hint 80). In which character a tunnel diode differs from pn diode? Doping density Terminals Conductance Application Hint 81). On ___ voltage application to tunnel diode band conversion takes place? 1V 0V 2V 5V Hint 82). On application of minimum voltage to tunnel diode ____ quantity of electrons flow across depletion region? Maximum Zero Infinity Minimum Hint 83). At ___ voltage condition in tunnel diode charge carriers are generated? Low High Zero Infinite Hint 84). When there is increase in voltage level the bands in tunnel diode____? Overlap Separates Divides All the above Hint 85). Increase in conductor based voltage then tunnel current becomes _____? 0V 1V 2V 5V Hint 86). The bands ____ with increase in conductor voltage? Overlaps Not overlaps Breaks All the above Hint 87). Which of the following are the equivalent circuit components of a tunnel diode? Resistor Capacitor Inductor All the above Hint 88). Which of the following is the resistance value of a resistor used in tunnel diode? 5 4 3 1 Hint 89). Which of the following is the inductor value of a resistor used in tunnel diode? 0.5nH 0.2nH 0.1nH 0.3nH Hint Read more about Inductor. 90). Which of the following is the capacitance value of a resistor used in tunnel diode? 5 to 100pF 4-100pF 50 to 100pF 100 to 1000 pF Hint 91). ____ is defined as the current flow via diode due to punching of electron across PN junction? Valley current Tunneling current Negative resistance characteristics Positive resistance characteristics Hint 92). A heavy doping condition occurs due to ___ condition? Forward bias Reverse bias Both a and b Zero bias Hint 93). Which of the following are the components of a tunnel diode oscillator? Inductance Capacitance Internal resistance All the above Hint 94). Resistance, Inductance and capacitance in an tunnel diode oscillator are connected in ____ configuration? Parallel Serial One after the another Both b and c Hint 95). At ___ condition the tunnel diode oscillator amplitude is blocked? Positive resistance Negative resistance Zero resistance None of the above Hint 96). Which of the following is the formula for oscillation frequency of tunnel diode oscillator? F=1/2π [sqrt LC] F=1/2π [LC] F=1/π [sqrt LC] F=1/ [sqrt LC] Hint 97). Which of the following is the frequency value of a tunnel diode oscillator? 100GHz 10GHz 1000GHz 100MHz Hint 98). Which of the following are the applications of tunnel diode oscillator? Relaxations Microwaves Amplifiers Both a and b Hint 99). The switching capacity of a tunnel diode is ____? High Low Zero Infinite Hint 100). Due to low current based property a tunnel diode is used as ___? FM receivers Oscillator circuits Amplifiers Both a and b Hint Read more about FM. 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