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Oscillators Question & Answers

June 5, 2021 By WatElectronics

This article lists 100+ oscillators MCQs for engineering students. All the oscillators Questions & Answers given below include a hint and wherever possible link to the relevant topic. This is helpful for the users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the oscillators topic.

Oscillators are devices known for converting the signals DC into AC. Any amplifier can be converted to an oscillator by giving a feedback connection. An amplifier for amplification prefers negative feedback and provided with positive feedback results in oscillations.

The signal produced at the output is continuous it can be a sine wave, square wave, or triangular wave. Based on frequency these oscillators are classified as Low-frequency oscillators, Audio frequency oscillators, and Radiofrequency oscillators.

The two main classifications of oscillators are Harmonic or linear oscillators and Relaxation or non-linear oscillators. They are used in Clock generators, Calculators, other complex peripherals, and so on.

1). What is the very first practical oscillator based on?

Hint
2). Oscillator circuit built by _______________.

Hint
3). Parametric oscillator circuit is developed by ________.

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4). Arc oscillator rediscovered by _____________.

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5). Vacuum-tube Feedback Oscillators were invented in ___________.

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6). Edwin Armstrong preferred ______________feedback.

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7). _______________ converts Direct Current (DC) signals available from the power supply units to Alternate Current (AC) signals.

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8). A _________ criterion determines mathematical condition to obtain sustained oscillations.

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9). What are the types of oscillators based on frequency as the parameter?

Hint
10). The _____________ feedback is used in oscillators.

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11). Which of the oscillators doesn’t come under the category of low frequency oscillators?

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12). Both negative and the positive feedback is present in _______ oscillator.

Hint
13). The filter in the RC oscillator circuit consists of ___________.

Hint
14). Which of these oscillators doesn’t consists of LC tank circuit?

Hint
15). Positive feedback results in ___________ oscillations.

Hint
16) .Microprocessors uses _________ oscillators.

Hint
17). UJT is a ____________ oscillator.

Hint
18). The very first and the mostly used circuit of Relaxation oscillator is __________.

Hint
19). __________ Circuits are the base for the design of contemporary microwave oscillators.

Hint
20). Multivibrators comes under the category of ___________ oscillators.

Hint
21). Non-sinusoidal oscillators are _____________.

Hint
22). The frequency in the LC oscillator is ____________.

Hint
23). Which is the most stable oscillator?

Hint
24). If the value of capacitor is at maximum in LC tank circuit, the energy at the inductor is ____________.

Hint
25). Hartley oscillator consists of ________ inductors.

Hint

Oscillator MCQs for Interview

26). The phase shift obtained at the feedbacks loop is ____________ degrees.

Hint
27). Theoretically the gain in the oscillator must be equal to _______.

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28). Which oscillator used to generate 1 Mega hertz signal?

Hint
29). Which oscillators are preferred in the Timing elements?

Hint
30). Hartley oscillator has ________ capacitors in its Tank circuit.

Hint
31). Operating range of frequency of Hartley oscillators is _____________.

Hint
32). How many capacitors are present in Colpitts oscillator?

Hint
33). Additional capacitor in series with the inductor is placed in which oscillator?

Hint
34). The flow of energy is unidirectional in which oscillators?

Hint
35). In which oscillators the energy can be exchanged between passive and the active components?

Hint
36). The oscillations frequency in harmonic oscillator can be determined by ______________.

Hint
37). Oscillations frequency of relaxation oscillators can be determined by ___________.

Hint
38). Harmonic oscillators generate _______ waveforms as output.

Hint
39). Relaxation oscillators generate _______ waveforms as output.

Hint
40). The device active in the LC oscillator of transistor is _________.

Hint
41). The drawback of LC oscillators are _____________.

Hint
42). Inductors used in LC oscillators makes the circuit bulky and ____________.

Hint
43). RC oscillators are also known as __________________

Hint
44). Total phase shift in the RC oscillators is _______.

Hint
45). The frequency in the Phase shift oscillators can be determined by __________ components.

Hint
46). Which oscillators has fixed set of frequencies?

Hint
47). What is the reason of failure of Crystal oscillators?

Hint
48). The Q factor of the Crystal oscillator is ____________.

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49). The network of RC in the Wien bridge oscillators is known as ___________.

Hint
50). The increase in the frequency makes the phase-shift ____________ in the Wien bridge oscillator.

Hint

Oscillator Multiple Choice Question and Answers

51). The decrease in the frequency makes the phase-shift ___________ in the Wien bridge oscillator.

Hint
52). How many RC networks present in Twin-T oscillators?

Hint
53). Feedback in the colpitts oscillator is by __________ component.

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54). Tank circuits in Colpitts oscillator possess ________ capacitors.

Hint
55). Improved performance of Colpitts oscillator in comparison to the Hartley oscillator is because of _________ components.

Hint
56). Gain device of Colpitts oscillators behaves as _______ filter.

Hint
57). Which feedback is present in Colpitts oscillator?

Hint
58). What is the active element of the Colpitts oscillator?

Hint
59). The circuit of Colpitts oscillator is capacitive and improves the __________.

Hint
60). Oscillations classified as sustained and damped based on ___________.

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61). Colpitts oscillator’s frequency is ________.

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62). For the feedback component used in Hartley oscillators are _____________.

Hint
63). Number of capacitors in Hartley oscillator is _______.

Hint
64). Number of inductors in Hartley oscillators are _________.

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65). Difference between Hartley and the Colpitts oscillators is _________.

Hint
66). Self-limiting oscillators are ___________.

Hint
67). The voltage divided in the Clapps oscillator is due to _________.

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68). Which effect is present in Crystal oscillators?

Hint
69). Threshold voltage is pre-determined in ______________.

Hint
70). Relaxation oscillator made up of op-amp circuit is referred to as ____________.

Hint
71). Relaxation oscillator’s op-amp circuit generates ________ signal.

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72). Possibility of signaling of internal clock in the digital circuits is by ____________.

Hint
73). VCO stands for ________________.

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74). The frequency of oscillations in the VCO is controlled by __________.

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75). Phase-shift at the tank circuit of Hartley oscillators is ____________ degrees.

Hint

Oscillators Important Questions with Answers

76). An LC circuit in the oscillator is known as ____________.

Hint
77). RFC stands for ______________.

Hint
78). Clapp Oscillator preferred above __________ for the construction of Variable frequency oscillators.

Hint
79). How many capacitors are present in the Clapp oscillators?

Hint
80). Which type of feedback is present in Clapp oscillators?

Hint
81). The amount or the value of the feedback applied as the input at transistor is determined by ________ in the Clapp oscillators.

Hint
82). _____________ oscillator has the constant frequency in the output.

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83). If there is no signal at input applied what triggers the operation of oscillators?

Hint
84). Harmonic oscillators are ________.

Hint
85).Which of these is not considered as non-sinusoidal oscillators?

Hint
86). If the value of capacitor is tends to be maximum the energy at the inductor reaches ___________ in LC oscillators.

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87). If the frequency of the crystal tends to change with temperature, the crystal is said to have __________ coefficient of temperature.

Hint
88). Basic difference between oscillators and amplifiers is ___________.

Hint
89). What is the limitation of Crystal oscillator?

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90). Ocxo is an acronym for ___________.

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91). Which oscillator is known as Meissner oscillator?

Hint
92). __________ oscillators have transformer coupling.

Hint
93). Practically a circuit for triangular-wave is a combination of __________.

Hint
94). __________ oscillators frequency gets varied by varying DC control voltage.

Hint
95). Crystal oscillators are mostly found in ___________.

Hint
96). A GPS unit uses __________ oscillators.

Hint
97). Radio receivers use ___________ oscillators.

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98). Phase-Locked loop (PLL) uses ________ oscillators.

Hint
99). Digital systems prefer _____________ oscillators.

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100). The signal generators utilized in the general laboratories are _______ oscillators.

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101). 555 Timer consists of ________.

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102). The crystal in crystal oscillator acts as __________.

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Read More About Colpitts Oscillator

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