Oscillators Question & Answers September 1, 2021 By Wat Electrical Leave a Comment This article lists 100 Oscillators MCQs for engineering students. All the Oscillators Questions & Answers given below includes solution and link wherever possible to the relevant topic. Oscillators are AC signal generators that are used in laboratories for producing sine waves. The sine wave is a type of wave that is used as a test signal for many applications. Electronic oscillators are used in a wide range of applications. The oscillators are used in laptop and smartphone processors for generating clock signals, in radio and mobile receivers the oscillators are used for generating the local carrier, and even they are used in the signal generators which are used in the lab to test the circuits. 1). How many types of oscillators are there? One Two Three Four Hint 2). Which one of the following is an LC oscillator? Hartley Wein bridge Phase shift All of the above Hint 3). Which one of the following is an RC oscillator? Colpitts Wein bridge Clapps All of the above Hint 4). The crystal oscillator is categorized into __________ types One Two Three Four Hint 5). The LC oscillators used in ________ Frequency synthesizers TV Radio All of the above Hint 6). What are the advantages of crystal oscillators? Q is very high Frequency stability is very high Both a and b None of the above Hint 7). In a feedback network the crystal oscillators use ________ material Crystal Silicon Germanium All of the above Hint 8). The frequency range of the audio frequency oscillator is _______ 20Hz-200KHz 2Hz-2KHz 20Hz-20KHz 200Hz-200KHz Hint 9). Which one of the following oscillators is a type of sinusoidal oscillator? RC LC Crystal All of the above Hint 10). The frequency range of the radiofrequency oscillator is _______ 20Hz-200KHz 2Hz-2KHz 20Hz-20KHz 200Hz-200KHz Hint 11). Which one of the following have infinite gain? Amplifiers Oscillators Both a and b None of the above Hint 12). Which one of the following uses positive feedback? Amplifiers Oscillators Both a and b None of the above Hint 13). Which one of the following is a non-sinusoidal oscillator? UJT relaxation LC oscillator RC oscillator All of the above Hint 14). The frequency range of a very high-frequency oscillator is _______ 30MHz-300MHz 2Hz-2KHz 20Hz-20KHz 200Hz-200KHz Hint 15). Which one of the following are self-generating circuits? Amplifiers Oscillators Both a and b None of the above Hint 16). Which one of the following gives an oscillatory signal? Amplifiers Oscillators Both a and b None of the above Hint 17). The frequency range of microwave oscillator is __________ 30MHz-300MHz 2Hz-2KHz 20Hz-20KHz 3GHz-30GHz Hint 18). __________ oscillator, oscillations depends on the positive feedback Feedback Relaxation Both a and b None of the above Hint 19). Which one of the following circuits gives a low-frequency oscillator? RC LC Both a and b None of the above Hint 20). Which one of the following operates as a source? Amplifiers Oscillators Both a and b None of the above Hint 21). The input signal is not required in __________ Amplifiers Oscillators Both a and b None of the above Hint 22). Which one of the following circuits gives a high-frequency oscillator? RC LC Both a and b None of the above Hint 23). Which one of the following oscillators was invented by Ralph Hartley? Colpitts Claps Hartley None of the above Hint 24). Which one of the following doesn’t require a resonant circuit? Amplifiers Oscillators Both a and b None of the above Hint 25). ___________ operates as a multiplier Amplifiers Oscillators Both a and b None of the above Hint Oscillators Important MCQ's with Hints 26). Which one of the following has poor stability? Amplifiers Oscillators Both a and b None of the above Hint 27). Which one of the following oscillators has a limited tuning range? Harmonic Non-linear Both a and b None of the above Hint 28). The ring oscillator is an example for _____ oscillators Linear Non-linear Both a and b None of the above Hint 29). The frequency range of ultra-high frequency oscillator is _______ 300MHz-3GHz 2Hz-2KHz 20Hz-20KHz 200Hz-200KHz Hint 30). Which one of the following oscillator was developed by Max Wein? Colpitts Claps Hartley Wein bridge Hint 31). The RC oscillator produces an output signal in _________ wave Square Triangular Sine None of the above Hint 32). What is the standard form of VFO? Variable Frequency Oscillator Voltage Frequency Oscillator Vertical Frequency Oscillator None of the above Hint 33). What is the physical quantity of candela? Luminous intensity Electric current Amount of substance None of the above Hint 34). What is the physical quantity of mole? Luminous intensity Electric current Amount of substance None of the above Hint 35). Which one of the following is an active device in an LC transistor oscillator? Transistor Biasing and LC tank circuit Both a and b None of the above Hint 36). The inductor energy in the LC circuit is ___________ when the capacitor is max Minimum Maximum Infinity Zero Hint 37). The frequency in the LC oscillator is inversely proportional to the square root of ________ Inductor Capacitor Inductor or capacitor None of the above Hint 38). How many RC sections do we use in the phase shift oscillator? One Two Three Four Hint 39). __________ are the frequency-determining elements in a phase shift oscillator Resistor Capacitor Both a and b None of the above Hint 40). The frequency range of the millimeter-wave oscillator is _______ 300MHz-3GHz 30GHz-300GHz 20Hz-20KHz 200Hz-200KHz Hint 41). Which one of the following oscillators is a fixed frequency oscillator? Phase shift Crystal Colpitts None of the above Hint 42). The frequency range of low-frequency oscillator is _______ 300MHz-3GHz 30GHz-300GHz 20Hz-100KHz 200Hz-200KHz Hint 43). The frequency range of high-frequency oscillator is _______ 300KHz-2GHz 30GHz-300GHz 20Hz-100KHz 200Hz-200KHz Hint 44). The impedance of a crystal series resonance is _______________ Minimum Maximum Infinity Zero Hint 45). The impedance of a crystal is ____________ at parallel resonance Minimum Maximum Infinity Zero Hint 46). The approximate frequency range of the crystal oscillator is _____________ Fixed 1Hz to 1MHz 1Hz to 1GHz None of the above Hint 47). The multivibrator oscillator also called a ___________ oscillator Relaxation Astable Relaxation or astable None of the above Hint 48). Which one of the following is an LC-type oscillator? SAW oscillator Two integrator Ring All of the above Hint 49). Which one of the following is an RC-type oscillator? Ring SAW Crystal All of the above Hint 50). How many resonant frequencies does crystal has? One Two Three Four Hint Oscillators MCQ's for Interviews 51). Which resonant frequency in the crystal has low impedance? Series Parallel Both a and b None of the above Hint 52). The Gunn oscillators used as ________ Radio receivers Radio transmitters Radar sources All of the above Hint 53). The resonant frequency in Gunn oscillator is expressed as _________ f=2nc/L f=nc/2L f=nc/4L f=nc8/L Hint 54). Based on the feedback mechanism the oscillators are categorized into ________ One Two Three Four Hint 55). __________ are the type of oscillators based on the output waveform Sweep Sinewave Rectangular All of the above Hint 56). The approximate frequency range of the tickler feedback oscillator is _____________ Fixed 1Hz to 1MHz 1Hz to 1GHz Nearly fixed Hint 57). __________ are the type of oscillators based on the output signal frequency Radiofrequency Ultra high frequency High-frequency oscillator All of the above Hint 58). Which resonant frequency in the crystal has high impedance? Series Parallel Both a and b None of the above Hint 59). ____________ are the type of oscillators based on the type of frequency control we use LC RC Crystal All of the above Hint 60). Which oscillator uses a tuned circuit in the feedback? Tuned Untuned Both a and b None of the above Hint 61). _____________ feedback is used in an unturned oscillator Linear Non-linear Both a and b None of the above Hint 62). __________ are the tuned oscillators RC, SC LC Crystal All of the above Hint 63). __________ are the untuned oscillators Relaxation Ring Both a and b None of the above Hint 64). Which oscillator is controlled by power supply or current? Ring LC RC None of the above Hint 65). Which oscillator is controlled by the voltage-dependent capacitance? Ring LC RC None of the above Hint 66). The approximate frequency range of the Wein bridge oscillator is _____________ Fixed 1Hz to 1MHz 1Hz to 1GHz Nearly fixed Hint 67). Which one of the following oscillatosr doesn’t require inductors? RC LC Both a and b None of the above Hint 68). The frequency of oscillation in LC oscillator is given by _________ 1/LC 1/2LC 1/4LC 1/√LC Hint 69). The RC oscillators operates at ___________ frequency range 1-10MHZ 1-30MHZ 1-50MHZ 1-100MHZ Hint 70). What are the specifications of VCO? High-frequency Low noise Low power All of the above Hint 71). The voltage control oscillator consists __________ Tuning range Oscillation frequency Power consumption and phase noise All of the above Hint 72). What are the advantages of waveform oscillators? Low power Easy to fabricate Both a and b None of the above Hint 73). The frequency range of the Gunn oscillator is from _______ 5 to 65GHz 5 to 6GHz 5 to 50GHz 5 to 80GHz Hint Read more about Gunn Diode 74). Which oscillator is used to generate the low-frequency signal? RC LC Op-amp All of the above Hint 75). Which oscillator is used to generate the high-frequency signal? RC LC Op-amp All of the above Hint Oscillators MCQ's for Quiz 76). The approximate frequency range of the phase shift oscillator is _____________ Fixed 1Hz to 1MHz 1Hz to 1GHz 1Hz to 10MHz Hint 77). Which oscillator generates stable frequency? Op-amp based oscillators LC oscillators RC oscillators None of the above Hint 78). What are the applications of oscillators? Metal detectors Radiofrequency applications Video and audio systems All of the above Hint 79). Which one of the following oscillator is invented by Edwin H. Colpitts? Wein bridge Phase shift Colpitts None of the above Hint 80). The Colpitts oscillator generates frequency in the range of _________ 20KHz to 300MHz 1Hz to 1MHz 1Hz to 1GHz 1Hz to 10MHz Hint 81). The voltage control oscillators have _______ High packing density Low packing density Very high packing density Doesn’t have a packing density Hint 82). In which year the Wein bridge oscillator is developed? 1891 1997 2000 2016 Hint 83). In which year Colpitts oscillator is invented? 1891 1918 2000 2016 Hint 84). What are the advantages of the Wein bridge oscillator? Frequency stability is good Distortion is less High oscillator gain All of the above Hint 85). How many elements does the LC oscillator consist of? One Two Three Four Hint 86). How many elements does the RC oscillator consists of? One Two Three Four Hint 87). The approximate frequency range of hartley’s oscillator is _____________ Fixed 10KHz to 100MHz 1Hz to 1GHz 1Hz to 10MHz Hint 88). The output of an oscillator should be __________ Sinusoidal Non-sinusoidal Sinusoidal or non-sinusoidal None of the above Hint 89). What are the waves oscillators can produce? Square Sine Sawtooth All of the above Hint 90). The Wein bridge oscillator frequency is given by ____________ 1/2RC 1/2πRC 1/4RC 1/RC Hint 91). The Wein bridge oscillator is a type of _____________ oscillator Microwave b)c) d VHF Audio frequency None of the above Hint 92). Which feedback does the Wein bridge oscillator use? Positive Negative Both a and b None of the above Hint 93). The RC elements in a Wein bridge oscillator provides _____________ feedback Positive Negative Both a and b None of the above Hint 94). In radio receivers ___________ oscillators are used Wein bridge Colpitts Both a and b None of the above Hint 95). An ideal oscillator gain is _______ Zero One Infinity Finite Hint 96). The phase shift oscillator contains three stages of ___________ circuit RC LC Both a and b None of the above Hint 97). The approximate frequency range of the Colpitts oscillator is _____________ Fixed 10KHz to 100MHz 1Hz to 1GHz 1Hz to 10MHz Hint 98). An undamped oscillations require _________ Feedback amplifier Tuned circuit Both a and b None of the above Hint 99). The variable frequency oscillators are categorized into _________ One Two Three Four Hint 100). What is the standard form of DDS? Direct Digital Synthesis Digital Direct Synthesis Indirect Digital Synthesis None of the above Hint Read more about Oscillators One Two Three Four Hint Radio receivers Radio transmitters Radar sources All of the above Hint One Two Three Four Hint Time is Up! Time's up
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