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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?
HintA diode used in rectifier, clipper, clammper circuits.
2). A varactor diode is also called ____?
Hint3 names.
3). A varicap diode is a ____ type of component?
HintWorks with battery.
4). How many pins do varicap diode consist of?
HintEven number of pins.
5). Identify the diode mentioned in the following diagram?
Diode

Diode

HintA diode used in rectifier, clipper, clammper circuits.
6). Identify the anode terminal of varicap diode from the figure below.
Diode

Diode

HintLHS.
7). Identify the cathode terminal of varicap diode from the figure below.
Diode

Diode

HintRHS.
8). Identify the capacitor plates in the varicap diode displayed below.
Diode

Diode

HintOdd number.
9). Identify the PN diode in the varicap diode displayed below.
Diode

Diode

HintEven number.
10). A varicap is used as ___ device?
HintContains 2 parallel platess.
11). Which of the following are the application of Varicap?
HintPassive components.
12). Which of the following are the applications of VC-oscillators?
HintRelated to phase parameter of wave.
Read more about Frequency Modulator.
13). Which of the following are the applications of PLL?
Hint3 applications.
14). Who developed varicap device?
HintA subsidy of Ramo Wooldridge Corp.
15). A varicap diode operates in ____ bias condition?
HintWider depletion region.
16). Which of the following current type does not flow via varcap diode?
HintConstant value of source.
17). The reverse bias condition in varicap diode controls ___ property of depletion region?
Hint1 dimension varies.
18). Capacitance varying in varicap diode depends on _____?
HintAdding of impurities to semiconductor is?
Read more about Doping.
19). Which of the following is the formula of depletion region of varicap diode?
HintRatio of terms.
20). What is the value of capacitance when depletion region is wider?
HintDirectly proportional.
21). What is the value of thickness when depletion region is wider?
HintLess.
22). A hyper abrupt type varicap works with _____ voltage?
HintMinimum value.
23). The depletion layer in varicap diode is designed using _____?
Hint3 types.
24). In which of the following technology depletion layer in varcap diode plays a major role?
Hint2 technology.
25). Abbreviate CMOS?
HintContains N-type and P-type transistor.
Read more about CMOS.

Varactor Diode Interview Questions and Answers

26). MMIC stands for ____?
HintOperates at microwave frequencies (300 MHz to 300 GHz).
27). Which of the following is the operating frequency of MMIC?
HintHighest range.
28). Which of the following are the functions of MMIC?
Hint3 functions.
29). CMOS comprises of ___ type of semiconductors?
Hint2 impurities.
30). A P-type semiconductor has ____ as majority carriers?
HintNon-inverting polarity.
31). A N-type semiconductor has ____ as majority carriers?
HintInverting polarity.
32). Holes carriers are of ___ polarity?
HintNon-inverting polarity.
33). Electrons carriers are of ___ polarity?
HintInverting polarity.
34). Which of the following are the digital application of CMOS technology?
Hint3 applications.
Read more about Microprocessor.
35). Which of the following are the analog application of CMOS technology?
Hint3 applications.
Read more about RF Circuits.
36). A varicap diode input is connected to ____ type of circuit?
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?
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?
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?
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?
Hint10*10=?
41). AC voltage provided to varicap diode should be ___ value while designing varicap with tuned devices?
HintLess value.
42). Which of the following should be varicap diodes voltage to minimize capacitance switching?
Hint10*10=?
43). Current is measured in terms of ____?
Hint= 6.241*10^18 electrons (1 Coulomb) .
44). Resistance is measured in terms of ___?
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 i
45). Voltage is measured in terms of ___?
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 ___?
HintIs defined as when charged with one coulomb, there is a potential difference of one volt.
47). A varicap is a ____ source device?
HintP-type and N-type elements.
48). Which of the following are the types of varicap diodes?
Hint3 types.
49). The operation of varicap diode depends on ____?
Hint2 parallel plates device.
50). The symbol of varicap diode is similar to ____ diode?
HintStandard diode.

Varactor Diode MCQs for Exams

51). The noise generated in varicap diode is ____ compared to other diodes?
HintLow.
52). A varicap diode characteristic operation is plotted between ________ parameters?
HintVolts vs Farads.
53). Which of the following parameter is plotted on x-axis of varicap diode characteristic operation?
HintVolts units.
54). Which of the following parameter is plotted on y-axis of varicap diode characteristic operation?
HintFarads units.
55). The working principle of varicap diode depends on ____ components function?
Hint2 functions.
56). A capacitor is a ____ type of component?
Hint2 parallel plates device.
57). A capacitor is also referred to ____ component?
HintA heat exchanger device.
58). Which of the following component in capacitor design plays a major role?
HintOpposes current flow.
59). In varicap diode, capacitors capacitance is proportional to _____?
HintPolarity.
60). In reverse bias condition of varicap diode ____ number of regions are available?
HintEven number.
61). Which of the following is the valid point of varicap diode?
Hint3 points.
62). Abbreviate VCO?
HintA electronic oscillator whose oscillation frequency is controlled by a voltage input.
63). The VCO frequency obtained at output is proportional to ____ value?
HintVolts.
64). Which of the frequency range of VCO?
HintMinimum range.
65). VCO oscillators are classified in to __ number of types?
HintEven number.
66). Which of the following are the examples of harmonic based oscillator?
Hint2 examples.
Read more about Crystal Oscillator.
67). The output wave obtained from harmonic oscillator is ___ shape?
HintA smooth periodic oscillation.
68). The output obtained from relaxation type oscillator is ____ form?
Hint2 waves.
69). The output frequency obtained from relaxation type oscillator depends on _____ operation of capacitor?
Hint2 operations.
70). Which of the following is the purpose of Varicap diode in RF filter?
HintA receiver circuit such as a radio or television.
71). Which of the following are the components of RF filter?
Hint3 components.
72). Which of the following are the applications of varicap RF filter?
Hint3 applications.
73). Terminals of a diode are connected in _____ bias condition?
Hint2 bias condituion.
74). Which of the following are the examples of semiconductor substances used while manufacturing PN diode?
Hint3 substances.
75). Which of the following semiconducting substance is used for lower frequency of diode operation?
HintAtomic number 14.

Varactor Diode Quiz Questions and Answers.

76). Which of the following semiconducting substance is used for higher frequency of diode operation?
HintAtomic number 31.
77). Which of the following is the function of a capacitor?
Hint3 functions.
78). Which of the following is the equation of capacitance?
HintRatio of terms.
79). Which of the following are the advantages of varicap?
Hint3 advantages.
80). Which of the following are the disadvantages of varicap?
HintWider depletion region.
81). Which of the following type of varicap diode has inverse square CV function constant?
82). Which of the following are the characteristics of abrupt type varicap diode?
Hint2 characteristics.
83). Which of the following type of varicap diode has greater value of capacitance with provided input voltage?
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?
HintHaving a valency of three.
85). A n-type semiconducting substance is made up of?
HintHaving a valency of four.
86). A p-type impurities are _____ impurities?
HintReceiver.
87). A n-type impurities are _____ impurities?
HintSends charge.
88). A energy band consist of ___ bands?
Hint2 bands.
89). Which of the following is the upper band in energy band diagram?
HintAllows current flow.
Read more about Energy Band.
90). Which of the following is the lower band in energy band diagram?
Hint2 bands.
91). The plates used inn varicap diode is ____ substance?
HintAtomic number 79.
92). A capacitor in varicap diode consist of ____ substances?
Hint2 substances.
93). A substance that allows the flow of current freely is called ___?
HintFree movement of current.
94). A substance that does not allows the flow of current freely is called ___?
HintCurrent defensive substances.
95). A substance that allows the flow of current partially is called ___?
HintP-type and N-type.
96). ____ is defined as accumulation of charge?
HintRatio of the current which flows to the potential difference present.
97). The equivalent circuit of varicap diode consist of ____ components?
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 ___?
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 ___?
HintOutput terminal of one component is not connected to input of other terminal.
100). Abbreviate AFC an application of varicap diode?
HintAlso called Automatic Fine Tuning.

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