Varactor Diode Question & Answers March 7, 2022 By WatElectronics This article lists 100 Varactor Diode MCQs for engineering students. All the Varactor Diode Questions & 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 Varactor Diode. A diode is a semiconductor device designed with 2 terminals with positive and negative polarity. They are classified into a number of types based on the design, properties, and operating parameters. Diodes such as PN, Zener, Varactor, PIN, and more are examples of classification of the diode. A Varactor diode is a 2 terminals anode and cathode with a variable capacitor. A varactor diode is also called varicap, turning diode, resistance diode, or a variable capacitance. The main working of this diode depends on the capacitor operation. The construction of this diode is similar to the PN junction diode. A standard PN diode operates in 2 bias conditions forward and reverse, but a varicap diode operates only in reverse bias conditions with a change in capacitance value. Where the width of the varicap diodes junction in reverse bias is wider. Allowing the capacitor to charge at this biased condition. These diodes are further classified as hyper abrupt, abrupt, and gallium-arsenide. They benefit in terms of low noise, less power, and small size. But limit in terms of operating in reverse bias condition. The application of Varica includes frequency multiplier, VC-oscillator, and parametric amplifier. 1). _____ type of diode exploits reverse bias junction of PN voltage capacitance? Varactor diode Zener diode LED PIN diode None Hint 2). A varactor diode is also called ____? Varicap Variable capacitance Variable resistance All the above None Hint 3). A varicap diode is a ____ type of component? Active Passive Source dependent Both b and c None Hint 4). How many pins do varicap diode consist of? 1 2 3 4 None Hint 5). Identify the diode mentioned in the following diagram? Diode Varactor diode Zener diode LED PIN diode None Hint 6). Identify the anode terminal of varicap diode from the figure below. Diode 1 2 3 4 None Hint 7). Identify the cathode terminal of varicap diode from the figure below. Diode 1 2 3 4 None Hint 8). Identify the capacitor plates in the varicap diode displayed below. Diode 1 2 3 4 None Hint 9). Identify the PN diode in the varicap diode displayed below. Diode 1 2 3 4 None Hint 10). A varicap is used as ___ device? VC-capacitor VC-inductor VC-loader RC-capacitor None Hint 11). Which of the following are the application of Varicap? VC-oscillators Parametric amplifiers Frequency multipliers All the above None Hint 12). Which of the following are the applications of VC-oscillators? FM PLL PM Both a and b None Hint Read more about Frequency Modulator. 13). Which of the following are the applications of PLL? TV Radios Telephones All the above None Hint 14). Who developed varicap device? Intel Corp Pacific Semiconductor Phillips Corp Wipro Corp None Hint 15). A varicap diode operates in ____ bias condition? Forward Reverse Zero Both b and c None Hint 16). Which of the following current type does not flow via varcap diode? AC DC Zero Both a and b None Hint 17). The reverse bias condition in varicap diode controls ___ property of depletion region? Length Width Thickness Both b and c None Hint 18). Capacitance varying in varicap diode depends on _____? Doping Potential difference Voltage difference All the above None Hint Read more about Doping. 19). Which of the following is the formula of depletion region of varicap diode? sqrt[v*c]/t [v*c]/t [v*r]/t [i*c]/t None Hint 20). What is the value of capacitance when depletion region is wider? Increases Decreases Zero Both b and c None Hint 21). What is the value of thickness when depletion region is wider? 2μm 1μm 3μm 5μm None Hint 22). A hyper abrupt type varicap works with _____ voltage? Higher Lower Zero Infinite None Hint 23). The depletion layer in varicap diode is designed using _____? PN MOS Schottky diode All the above None Hint 24). In which of the following technology depletion layer in varcap diode plays a major role? CMOS MMIC NMOS Both a and b None Hint 25). Abbreviate CMOS? Complementary Metal-Oxide Semiconductor Common Metal-Oxide Semiconductor Complementary Metal-Oxide Site Complementary Metal-Oxide Slide None Hint Read more about CMOS. Varactor Diode Interview Questions and Answers 26). MMIC stands for ____? Monolithic microwave integrated circuit Monolithic mini integrated circuit Monolithic marco integrated circuit Moto microwave integrated circuit None Hint 27). Which of the following is the operating frequency of MMIC? 300 MHz to 300 GHz 200 MHz to 300 GHz 200 MHz to 200 GHz 100 MHz to 300 GHz None Hint 28). Which of the following are the functions of MMIC? Power amplification High frequency switching Microwave mixing All the above None Hint 29). CMOS comprises of ___ type of semiconductors? P N PN Both a and b None Hint 30). A P-type semiconductor has ____ as majority carriers? Holes Electrons Neutron Both a and c None Hint 31). A N-type semiconductor has ____ as majority carriers? Holes Electrons Neutron Both a and c None Hint 32). Holes carriers are of ___ polarity? Positive Negative Zero Both a and b None Hint 33). Electrons carriers are of ___ polarity? Positive Negative Zero Both a and b None Hint 34). Which of the following are the digital application of CMOS technology? Memory chips Microprocessor Microcontrollers All the above None Hint Read more about Microprocessor. 35). Which of the following are the analog application of CMOS technology? RF circuits Data converters Image sensors All the above None Hint Read more about RF Circuits. 36). A varicap diode input is connected to ____ type of circuit? Tunner Oscillator Rectifier None Hint 37). The tuned circuit in varicap diode is connected in parallel with ____ components? Resistor Inductor Capacitor Both b and c None Hint 38). To alter which of the following property DC voltage is applied to varicap diode? Inductance Capacitance Resistance All the above None Hint 39). The DC voltage should not be allowed through ____ circuit in varicap diode? Tuned Varicap Load All the above None Hint 40). The capacitor used in tuned circuit compared to varicap diode should be of _____ times greater value? 100 times 50 times 1000 times 10000 times None Hint 41). AC voltage provided to varicap diode should be ___ value while designing varicap with tuned devices? Maximum Minimum Zero Infinity None Hint 42). Which of the following should be varicap diodes voltage to minimize capacitance switching? 10mV 100mV 1000mV 10000mV None Hint 43). Current is measured in terms of ____? Amperes Ohms Volts Watts None Hint 44). Resistance is measured in terms of ___? Amperes Ohms Volts Watts None Hint 45). Voltage is measured in terms of ___? Amperes Ohms Volts Watts None Hint 46). Capacitance is measured in terms of ___? Amperes Ohms Farads Watts None Hint 47). A varicap is a ____ source device? Insulating Conducting Semiconducting All the above None Hint 48). Which of the following are the types of varicap diodes? Hyper abrupt Abrupt Gallium-arsenide All the above None Hint 49). The operation of varicap diode depends on ____? Resistance value Capacitance value Inductance value d. All None Hint 50). The symbol of varicap diode is similar to ____ diode? PIN PN Zener All the above None Hint Varactor Diode MCQs for Exams 51). The noise generated in varicap diode is ____ compared to other diodes? High Less Zero Infinite None Hint 52). A varicap diode characteristic operation is plotted between ________ parameters? VI VC RI RC None Hint 53). Which of the following parameter is plotted on x-axis of varicap diode characteristic operation? V I C R None Hint 54). Which of the following parameter is plotted on y-axis of varicap diode characteristic operation? V I C R None Hint 55). The working principle of varicap diode depends on ____ components function? Capacitor Capacitance Resistor Both a and b None Hint 56). A capacitor is a ____ type of component? Active Passive Source independent All the above None Hint 57). A capacitor is also referred to ____ component? Condenser Defensor Sensor All the above None Hint 58). Which of the following component in capacitor design plays a major role? Capacitor plates Medium used Terminals All the above None Hint 59). In varicap diode, capacitors capacitance is proportional to _____? Terminal region Stored charge Polarity All the above None Hint 60). In reverse bias condition of varicap diode ____ number of regions are available? 1 2 3 4 None Hint 61). Which of the following is the valid point of varicap diode? Available at minimum cost Highly reliable Does not operate in forward bias region All the above None Hint 62). Abbreviate VCO? Voltage Controlled Oscillator Variable Controlled Oscillator Voltage Conduct Oscillator None Hint 63). The VCO frequency obtained at output is proportional to ____ value? Applied input current Applied input voltage Applied input AC Applied input DC None Hint 64). Which of the frequency range of VCO? Hz to 100’s of GHz Hz to 10’s of GHz Hz to 1000’s of GHz Hz to 10000’s of GHz None Hint 65). VCO oscillators are classified in to __ number of types? 2 3 4 5 None Hint 66). Which of the following are the examples of harmonic based oscillator? Tank oscillator Crystal oscillator Saw tooth oscillator Both a and b None Hint Read more about Crystal Oscillator. 67). The output wave obtained from harmonic oscillator is ___ shape? Sinusoidal Triangle Sawtooth Rectangle None Hint 68). The output obtained from relaxation type oscillator is ____ form? Sinusoidal Triangle Sawtooth Both b and c None Hint 69). The output frequency obtained from relaxation type oscillator depends on _____ operation of capacitor? Charging Discharging Zero biasing Both a and b None Hint 70). Which of the following is the purpose of Varicap diode in RF filter? Tune Clamp Clip All the above None Hint 71). Which of the following are the components of RF filter? Microprocessor VCO Filter All the above None Hint 72). Which of the following are the applications of varicap RF filter? Frequency modulators Microwave receivers LC circuits All the above None Hint 73). Terminals of a diode are connected in _____ bias condition? Forward Zero Reverse Both a and c None Hint 74). Which of the following are the examples of semiconductor substances used while manufacturing PN diode? Silicon Germanium Gallium All the above None Hint 75). Which of the following semiconducting substance is used for lower frequency of diode operation? Silicon Germanium Gallium Platinum None Hint Varactor Diode Quiz Questions and Answers. 76). Which of the following semiconducting substance is used for higher frequency of diode operation? Silicon Germanium Gallium Platinum None Hint 77). Which of the following is the function of a capacitor? Store charge Charging Discharging All the above None Hint 78). Which of the following is the equation of capacitance? c=eA/W c=eW/A c=eW+A c=eW-A None Hint 79). Which of the following are the advantages of varicap? Low noise Less power Small size All the above None Hint 80). Which of the following are the disadvantages of varicap? High noise High power dissipation Operates in forward bias condition Operates in reverse bias condition None Hint 81). Which of the following type of varicap diode has inverse square CV function constant? Abrupt diode Hyper abrupt diode Gallium-arsenide Both a and b None 82). Which of the following are the characteristics of abrupt type varicap diode? Constant doping concentration Inverse square of CV function Direct square of CV function Both a and b None Hint 83). Which of the following type of varicap diode has greater value of capacitance with provided input voltage? Abrupt diode Hyper abrupt diode Gallium-arsenide Both a and b None Hint 84). A p-type semiconducting substance is made up of?84. A p-type semiconducting substance is made up of? Trivalent Tetravalent Pentavalent All the above None Hint 85). A n-type semiconducting substance is made up of? Trivalent Tetravalent Pentavalent All the above None Hint 86). A p-type impurities are _____ impurities? Acceptor Rejector Donor Both b and c None Hint 87). A n-type impurities are _____ impurities? Acceptor Rejector Donor Both b and c None Hint 88). A energy band consist of ___ bands? Conduction band Valance band Zero ban Both a and b None Hint 89). Which of the following is the upper band in energy band diagram? Conduction band Valance band Zero ban Both a and b None Hint Read more about Energy Band. 90). Which of the following is the lower band in energy band diagram? Conduction band Valance band Zero band Both b and c None Hint 91). The plates used inn varicap diode is ____ substance? Gold Silver Platinum Both b and c None Hint 92). A capacitor in varicap diode consist of ____ substances? Conducting Insulating Resistive Both a and b None Hint 93). A substance that allows the flow of current freely is called ___? Conducting Insulating Resistive Both a and b None Hint 94). A substance that does not allows the flow of current freely is called ___? Conducting Insulating Resistive Both a and b None Hint 95). A substance that allows the flow of current partially is called ___? Conducting Insulating Resistive Semiconducting None Hint 96). ____ is defined as accumulation of charge? Inductance Conductance Capacitance Resistance None Hint 97). The equivalent circuit of varicap diode consist of ____ components? Resistors Inductors Capacitors Both a and c None Hint 98). The 3 resistors in equivalent circuit of varicap diode are connected in ___? Series Parallel One above the other Both b and c None Hint 99). The 3 resistors and a capacitor in equivalent circuit of varicap diode are connected in ___? Series Parallel One above the other Both b and c None Hint 100). Abbreviate AFC an application of varicap diode? Automatic Frequency Controller Automatic Fast Controller Automatic Frequency Conductor Air Frequency Controller None Hint For More MCQs Zener Diode Questions & Answers Schottky Diode Question & Answers Tunnel Diode Question & Answers Avalanche Photodiode Question & Answers PN Junction Diode Question & Answers Please fill in the comment box below. Time's up
