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Voltage Controlled Oscillator Question & Answers

September 5, 2022 By WatElectronics

This article lists 75 Voltage Controlled Oscillator MCQs for engineering students. All the Voltage Controlled Oscillator  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 on the fundamentals of Voltage Controlled Oscillator. 

Electronic oscillators whose oscillation frequency is dependent upon the applied input voltages are referred to as Voltage Controlled Oscillators. The instantaneous frequency of oscillators is determined by making use of applied voltages at the input. Based on the controlled inputs applied to the modulated signal Voltage Controlled Oscillators are used for Phase or Frequency modulation.

Voltage Controlled Oscillators are an essential part of PLLs (Phase Locked Loop). These are also utilized as Synthesizers and their pitch gets adjusted based on determined voltages. There are various forms of Voltage Control Oscillators generally could be RC Oscillators, LC Oscillators, or Crystal.

Input voltages and capacitance are inversely in proportion to each other in VCO. An increase in voltage at the input reduces the capacitance whereas the oscillation frequency is in direct proportion to the control voltages. To achieve varying voltages Varactor diodes whose capacitances are variable are used in Voltage Controlled Oscillators.

Further, these VCOs are categorized into two types: Harmonic and Relaxation Oscillators. The electronic equipment of jamming, Function Generators, PLLs, and Synthesizers placed in Communication circuits, etc.… are the various applications where VCOs are used.

1). How is oscillation frequency gets controlled in Voltage Controlled Oscillator?

Hint
2). Output frequency of Voltage Control Oscillator is inversely in proportion to _______?

Hint

Read More About Crystal Oscillators

3). Voltage Control Oscillators frequency is directly in proportion to _________?

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4). What is VFC?

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5). In how many groups, voltage controlled oscillators are categorized?

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6). What are the various types of voltage controlled oscillators?

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7). What type of oscillators generate sinusoidal waves as the outcome?

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8). What does a harmonic oscillator consist of?

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9). Which one is the Harmonic oscillator?

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10). What are the formulae to calculate obtained frequency at the output in voltage controlled oscillator?

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11). Crystal oscillators are ___________?

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12). What type of waveform is produced by Relaxation oscillators?

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13). What kind of oscillators are utilized in Integrated Circuits?

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14). What type of oscillators have minimum components externally?

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15). Relaxation oscillators provides wide ranges of ________?

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16). What isolates the resonator in Harmonic oscillators?

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17). Voltage-Controlled capacitor used in making of ______?

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18). How the frequencies in ring oscillators are controlled?

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19). What are the prominent characteristics of Voltage Control Oscillators?

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20). What is preferred in voltage control oscillators?

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21). What effects phase noise in voltage control oscillators?

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22). What are the various elements that determine Phase noise?

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23). What reduces the effects of Flicker noise?

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24). Flickering noise of low frequencies affect __________ in VCO?

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25). In comparison to Fixed frequency oscillators, VCOs have ______ Q-Factor?

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Voltage Controlled Oscillator MCQs for Interviews

26). Voltage control oscillators doesn’t have __________?

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27). What are the commonly used voltage controlled oscillator circuits?

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28). What is the purpose of a voltage-controlled crystal oscillator?

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29). What is the purpose of the voltage control crystal oscillator clock generator?

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30). What are the design parameters of the voltage control crystal oscillator clock generator?

Hint

Read More About UJT Relaxation Oscillator

31). What is the equation to calculate the time period of the voltage controlled oscillator?

Hint
32). Determine the flow of current in Voltage Control Oscillators. For NE566 resistor connected externally i.e., RT is 200 ohms and voltage at input is 2.5 Volts (Consider VCC= + 5Volts).

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33). What is the frequency at output if there is no voltage signal applied at the input?

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34). Calculate the capacitor value connected externally for no input voltage applied to Voltage Control Oscillator. For Output frequency, 20 kHz & RT is 5 K ohms.

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35). What is the maximum frequency at the output for NE566?

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36). Which of these voltage control oscillators have the highest frequency at the output?

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37). What is meant by Voltage to Frequency Conversion Factor?

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38). Calculate Kv of the Voltage Control Oscillator if fo is 150Hz & VCC is 10 Volts.

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39). What is the equation of frequency changing in the voltage controlled oscillator?

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40). Calculate the resistor value connected externally for no input voltage applied to Voltage Control Oscillator. For Output frequency 20 kHz & CT is 2.5 nF.

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41). What various forms of VCO are obtained?

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42). Which form of VCO offers maximum flexibility in terms of design?

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43). How is frequency controlled is achieved in VCO?

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44). _________ determines the Tuning range of voltage controlled oscillator?

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45). Selection of BJT and varactor in VCO is based on ________?

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46). How the Voltage Control of the Oscillator can be realized?

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47). Which form of VCO takes up more area of PCB?

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48). Input tuned voltage corresponding to voltage swings at input in ________?

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49). What is the indicator of VCO’s purity of signals?

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50). What broadens spectral response in VCO?

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Voltage Controlled Oscillators MCQs for Exams

51). Why is the Phase noise incurred in VCO?

Hint
52). Phase Noise in ________leads to Timing jitter?

Hint
53). What is TIE in VCO?

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54). What represents the upcoming high level of Integration of circuits?

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55). What form of VCO can be used as a component?

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56). In what ranges Modular VCOs are available?

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57). What form of VCO provides the highest density of volume?

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58). MAX2623 is a ______ form of VCO?

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59). What are the examples of Monolithic VCOs?

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60). What does a MAX2623 consist of?

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61). How many pins does a Maxim Integrated (MAX2623) VCO have?

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62). HMC512LP5ETR VCO is used in _______?

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63). Basic VCO circuits are built using _______?

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64). What are the various voltage controlled oscillators?

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65). LM566 VCO can generate _________ waves?

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66). What is the mainly focused parameter of VCO?

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67). Frequency hopping applications use ____________?

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68). What are the various applications of voltage control oscillators?

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69). What converts lower frequency signals to Audio range of frequencies?

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70). What device is utilized in diagnostics and recording?

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71). How the output frequencies in voltage controlled oscillators are changed?

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72). Voltage controlled oscillators are used in ______?

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73). What are the various applications of Voltage Control Crystal Oscillator Clock Generator?

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74). High frequency voltage controlled oscillators are used in _______?

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75). Monolithic Function Generators are _________?

Hint

For More MCQs

  • Oscillators Question & Answers
  • RC Phase Shift Oscillator Question & Answers
  • Hartley Oscillator Question & Answers
  • Colpitts Oscillator Question & Answers
  • Wien Bridge Oscillator Question & Answers

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