Varactor Diode Question & AnswersMarch 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 HintA diode used in rectifier, clipper, clammper circuits.2). A varactor diode is also called ____? Varicap Variable capacitance Variable resistance All the above Hint3 names.3). A varicap diode is a ____ type of component? Active Passive Source dependent Both b and c HintWorks with battery.4). How many pins do varicap diode consist of? 1 2 3 4 HintEven number of pins.5). Identify the diode mentioned in the following diagram?Diode Varactor diode Zener diode LED PIN diode HintA diode used in rectifier, clipper, clammper circuits.6). Identify the anode terminal of varicap diode from the figure below.Diode 1 2 3 4 HintLHS.7). Identify the cathode terminal of varicap diode from the figure below.Diode 1 2 3 4 HintRHS.8). Identify the capacitor plates in the varicap diode displayed below.Diode 1 2 3 4 HintOdd number.9). Identify the PN diode in the varicap diode displayed below.Diode 1 2 3 4 HintEven number.10). A varicap is used as ___ device? VC-capacitor VC-inductor VC-loader RC-capacitor HintContains 2 parallel platess.11). Which of the following are the application of Varicap? VC-oscillators Parametric amplifiers Frequency multipliers All the above HintPassive components.12). Which of the following are the applications of VC-oscillators? FM PLL PM Both a and b HintRelated to phase parameter of wave. Read more about Frequency Modulator.13). Which of the following are the applications of PLL? TV Radios Telephones All the above Hint3 applications.14). Who developed varicap device? Intel Corp Pacific Semiconductor Phillips Corp Wipro Corp HintA subsidy of Ramo Wooldridge Corp.15). A varicap diode operates in ____ bias condition? Forward Reverse Zero Both b and c HintWider depletion region.16). Which of the following current type does not flow via varcap diode? AC DC Zero Both a and b HintConstant value of source.17). The reverse bias condition in varicap diode controls ___ property of depletion region? Length Width Thickness Both b and c Hint1 dimension varies.18). Capacitance varying in varicap diode depends on _____? Doping Potential difference Voltage difference All the above HintAdding of impurities to semiconductor is? 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 HintRatio of terms.20). What is the value of capacitance when depletion region is wider? Increases Decreases Zero Both b and c HintDirectly proportional.21). What is the value of thickness when depletion region is wider? 2μm 1μm 3μm 5μm HintLess.22). A hyper abrupt type varicap works with _____ voltage? Higher Lower Zero Infinite HintMinimum value.23). The depletion layer in varicap diode is designed using _____? PN MOS Schottky diode All the above Hint3 types.24). In which of the following technology depletion layer in varcap diode plays a major role? CMOS MMIC NMOS Both a and b Hint2 technology.25). Abbreviate CMOS? Complementary Metal-Oxide Semiconductor Common Metal-Oxide Semiconductor Complementary Metal-Oxide Site Complementary Metal-Oxide Slide HintContains N-type and P-type transistor. Read more about CMOS.Varactor Diode Interview Questions and Answers26). MMIC stands for ____? Monolithic microwave integrated circuit Monolithic mini integrated circuit Monolithic marco integrated circuit Moto microwave integrated circuit HintOperates at microwave frequencies (300 MHz to 300 GHz).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 HintHighest range.28). Which of the following are the functions of MMIC? Power amplification High frequency switching Microwave mixing All the above Hint3 functions.29). CMOS comprises of ___ type of semiconductors? P N PN Both a and b Hint2 impurities.30). A P-type semiconductor has ____ as majority carriers? Holes Electrons Neutron Both a and c HintNon-inverting polarity.31). A N-type semiconductor has ____ as majority carriers? Holes Electrons Neutron Both a and c HintInverting polarity.32). Holes carriers are of ___ polarity? Positive Negative Zero Both a and b HintNon-inverting polarity.33). Electrons carriers are of ___ polarity? Positive Negative Zero Both a and b HintInverting polarity.34). Which of the following are the digital application of CMOS technology? Memory chips Microprocessor Microcontrollers All the above Hint3 applications. 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 Hint3 applications. Read more about RF Circuits.36). A varicap diode input is connected to ____ type of circuit? Tunner Oscillator Rectifier HintA device used by musicians and technicians to measure the pitch of a musical instrument.37). The tuned circuit in varicap diode is connected in parallel with ____ components? Resistor Inductor Capacitor Both b and c HintA component with 2 parallel plates and a component with coil.38). To alter which of the following property DC voltage is applied to varicap diode? Inductance Capacitance Resistance All the above HintThe ratio of the amount of electric charge stored on a conductor to a difference in electric potential.39). The DC voltage should not be allowed through ____ circuit in varicap diode? Tuned Varicap Load All the above HintA device used by musicians and technicians to measure the pitch of a musical instrument to adjust or correct the input signal to the desired pitch.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 Hint10*10=?41). AC voltage provided to varicap diode should be ___ value while designing varicap with tuned devices? Maximum Minimum Zero Infinity HintLess value.42). Which of the following should be varicap diodes voltage to minimize capacitance switching? 10mV 100mV 1000mV 10000mV Hint10*10=?43). Current is measured in terms of ____? Amperes Ohms Volts Watts Hint= 6.241*10^18 electrons (1 Coulomb) .44). Resistance is measured in terms of ___? Amperes Ohms Volts Watts HintEqual to the resistance of a conductor through which a current of one ampere flows when a potential difference of one volt is applied to i45). Voltage is measured in terms of ___? Amperes Ohms Volts Watts HintEqual to the difference in potential between two points in a conductor carrying one ampere current when the power dissipated between the points is one watt.46). Capacitance is measured in terms of ___? Amperes Ohms Farads Watts HintIs defined as when charged with one coulomb, there is a potential difference of one volt.47). A varicap is a ____ source device? Insulating Conducting Semiconducting All the above HintP-type and N-type elements.48). Which of the following are the types of varicap diodes? Hyper abrupt Abrupt Gallium-arsenide All the above Hint3 types.49). The operation of varicap diode depends on ____? Resistance value Capacitance value Inductance value d. All Hint2 parallel plates device.50). The symbol of varicap diode is similar to ____ diode? PIN PN Zener All the above HintStandard diode.Varactor Diode MCQs for Exams51). The noise generated in varicap diode is ____ compared to other diodes? High Less Zero Infinite HintLow.52). A varicap diode characteristic operation is plotted between ________ parameters? VI VC RI RC HintVolts vs Farads.53). Which of the following parameter is plotted on x-axis of varicap diode characteristic operation? V I C R HintVolts units.54). Which of the following parameter is plotted on y-axis of varicap diode characteristic operation? V I C R HintFarads units.55). The working principle of varicap diode depends on ____ components function? Capacitor Capacitance Resistor Both a and b Hint2 functions.56). A capacitor is a ____ type of component? Active Passive Source independent All the above Hint2 parallel plates device.57). A capacitor is also referred to ____ component? Condenser Defensor Sensor All the above HintA heat exchanger device.58). Which of the following component in capacitor design plays a major role? Capacitor plates Medium used Terminals All the above HintOpposes current flow.59). In varicap diode, capacitors capacitance is proportional to _____? Terminal region Stored charge Polarity All the above HintPolarity.60). In reverse bias condition of varicap diode ____ number of regions are available? 1 2 3 4 HintEven number.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 Hint3 points.62). Abbreviate VCO? Voltage Controlled Oscillator Variable Controlled Oscillator Voltage Conduct Oscillator HintA electronic oscillator whose oscillation frequency is controlled by a voltage input.63). The VCO frequency obtained at output is proportional to ____ value? Applied input current Applied input voltage Applied input AC Applied input DC HintVolts.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 HintMinimum range.65). VCO oscillators are classified in to __ number of types? 2 3 4 5 HintEven number.66). Which of the following are the examples of harmonic based oscillator? Tank oscillator Crystal oscillator Saw tooth oscillator Both a and b Hint2 examples. Read more about Crystal Oscillator.67). The output wave obtained from harmonic oscillator is ___ shape? Sinusoidal Triangle Sawtooth Rectangle HintA smooth periodic oscillation.68). The output obtained from relaxation type oscillator is ____ form? Sinusoidal Triangle Sawtooth Both b and c Hint2 waves.69). The output frequency obtained from relaxation type oscillator depends on _____ operation of capacitor? Charging Discharging Zero biasing Both a and b Hint2 operations.70). Which of the following is the purpose of Varicap diode in RF filter? Tune Clamp Clip All the above HintA receiver circuit such as a radio or television.71). Which of the following are the components of RF filter? Microprocessor VCO Filter All the above Hint3 components.72). Which of the following are the applications of varicap RF filter? Frequency modulators Microwave receivers LC circuits All the above Hint3 applications.73). Terminals of a diode are connected in _____ bias condition? Forward Zero Reverse Both a and c Hint2 bias condituion.74). Which of the following are the examples of semiconductor substances used while manufacturing PN diode? Silicon Germanium Gallium All the above Hint3 substances.75). Which of the following semiconducting substance is used for lower frequency of diode operation? Silicon Germanium Gallium Platinum HintAtomic number 14.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 HintAtomic number 31.77). Which of the following is the function of a capacitor? Store charge Charging Discharging All the above Hint3 functions.78). Which of the following is the equation of capacitance? c=eA/W c=eW/A c=eW+A c=eW-A HintRatio of terms.79). Which of the following are the advantages of varicap? Low noise Less power Small size All the above Hint3 advantages.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 HintWider depletion region.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 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 Hint2 characteristics.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 HintUpdate version of basic varicap.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 HintHaving a valency of three.85). A n-type semiconducting substance is made up of? Trivalent Tetravalent Pentavalent All the above HintHaving a valency of four.86). A p-type impurities are _____ impurities? Acceptor Rejector Donor Both b and c HintReceiver.87). A n-type impurities are _____ impurities? Acceptor Rejector Donor Both b and c HintSends charge.88). A energy band consist of ___ bands? Conduction band Valance band Zero ban Both a and b Hint2 bands.89). Which of the following is the upper band in energy band diagram? Conduction band Valance band Zero ban Both a and b HintAllows current flow. 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 Hint2 bands.91). The plates used inn varicap diode is ____ substance? Gold Silver Platinum Both b and c HintAtomic number 79.92). A capacitor in varicap diode consist of ____ substances? Conducting Insulating Resistive Both a and b Hint2 substances.93). A substance that allows the flow of current freely is called ___? Conducting Insulating Resistive Both a and b HintFree movement of current.94). A substance that does not allows the flow of current freely is called ___? Conducting Insulating Resistive Both a and b HintCurrent defensive substances.95). A substance that allows the flow of current partially is called ___? Conducting Insulating Resistive Semiconducting HintP-type and N-type.96). ____ is defined as accumulation of charge? Inductance Conductance Capacitance Resistance HintRatio of the current which flows to the potential difference present.97). The equivalent circuit of varicap diode consist of ____ components? Resistors Inductors Capacitors Both a and c HintA components that opposes current flow and a component that stores charge.98). The 3 resistors in equivalent circuit of varicap diode are connected in ___? Series Parallel One above the other Both b and c HintOutput terminal of one component connected to input of other terminal.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 HintOutput terminal of one component is not connected to input of other terminal.100). Abbreviate AFC an application of varicap diode? Automatic Frequency Controller Automatic Fast Controller Automatic Frequency Conductor Air Frequency Controller HintAlso called Automatic Fine Tuning.For More MCQsZener Diode Questions & AnswersSchottky Diode Question & AnswersTunnel Diode Question & AnswersAvalanche Photodiode Question & AnswersPN Junction Diode Question & Answers Please fill in the comment box below. Time is Up! Time's up
