114 + Interview Questions in Oscillators in Analog Circuits Page 1 InterviewSolution

1.	Oscillators are used to ______ AC voltage.(a) Prevent(b) Generate(c) Amplify(d) RectifyI had been asked this question by my school principal while I was bunking the class.I want to ask this question from Introduction to Oscillator topic in section Oscillators of Analog Circuits
Answer» Correct choice is (B) Generate Easy explanation: Oscillators are used for GENERATING AC voltage. They are OFTEN characterized by the frequency of the OSCILLATIONS PRODUCED. There are two main types of electronic oscillators, linear/harmonic and nonlinear/relaxation oscillator.

Discussion

2.	Oscillator __________ an AC input for giving an AC output.(a) Doesn’t need(b) Need(c) Doesn’t need at lower frequencies(d) Doesn’t need at higher frequenciesThe question was posed to me in an interview.My question is taken from Introduction to Oscillator in chapter Oscillators of Analog Circuits
Answer» Right option is (a) Doesn’t need For EXPLANATION I would say: An oscillator is an AMPLIFIER with positive feedback. It usually has a NOISE which is an amplifier as an oscillating OUTPUT. They do not require any type of specific input to function properly.

Discussion

3.	For accomplishing negative resistance in oscillator we use _____________(a) Voltage divider circuit(b) Negative feedback(c) Positive feedback(d) Current divider circuitThe question was posed to me in a national level competition.My query is from Introduction to Oscillator topic in portion Oscillators of Analog Circuits
Answer» RIGHT answer is (c) POSITIVE feedback Easiest explanation: The input or output impedance of an amplifier with positive feedback APPLIED, can be negative. When loop gain is greater than 1, the input impedance is a negative value, over a linear range. These are also called ACTIVE resistors.

Discussion

4.	Negative resistance are incorporated in oscillator for ___________(a) Sustained oscillation(b) Damped oscillation(c) Biasing the oscillator(d) Increasing amplitude of oscillationI got this question in a job interview.This intriguing question comes from Introduction to Oscillator in division Oscillators of Analog Circuits
Answer» Correct ANSWER is (a) Sustained oscillation The EXPLANATION: Negative RESISTANCE are incorporated in oscillator for sustained oscillation. Negative resistance will CANCEL the damping by positive (NORMAL) resistance.

Discussion

5.	Primary trigger for oscillation is obtained from ___________(a) DC voltage(b) Noise voltage(c) External trigger voltage(d) No trigger is requiredI got this question by my school teacher while I was bunking the class.This intriguing question comes from Introduction to Oscillator topic in chapter Oscillators of Analog Circuits
Answer» The correct answer is (b) Noise VOLTAGE To EXPLAIN I would say: The primary TRIGGER for oscillation is OBTAINED from noise voltage.

Discussion

6.	The AC power of output signal is obtained by ___________(a) Input AC voltage(b) Input DC voltage(c) DC biasing voltage(d) Power is generated by transistor itselfI had been asked this question in unit test.My doubt is from Introduction to Oscillator in section Oscillators of Analog Circuits
Answer» The correct choice is (c) DC BIASING voltage Best explanation: The AC POWER of OUTPUT signal is obtained by DC biasing voltage of amplifier.

Discussion

7.	The output of a stable oscillator have ___________(a) Constant amplitude(b) Varying amplitude(c) Constant amplitude at high frequencies only(d) Constant amplitude at low frequencies onlyThe question was posed to me in an international level competition.The doubt is from Introduction to Oscillator topic in division Oscillators of Analog Circuits
Answer» The correct answer is (a) Constant AMPLITUDE The explanation is: Output of a stable OSCILLATOR have constant amplitude and FREQUENCY. A common CRITERIA is the Barkhausen STABILITY criteria, wherein it states that loop gain should be unity and feedback should be positive.

Discussion

8.	In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called ___________(a) Positive feedback(b) Negative feedback(c) Cannot be predicted(d) Either positive or negative depending upon frequencyThe question was posed to me in an interview for job.My question is taken from Introduction to Oscillator in section Oscillators of Analog Circuits
Answer» Correct CHOICE is (a) Positive FEEDBACK Explanation: In an oscillator if phase of feedback is same as that of OSCILLATION WAVEFORM then feedback is CALLED positive feedback.

Discussion

9.	The output waveform of a stable oscillator have ___________(a) Constant frequency at low amplitude only(b) Constant frequency at high amplitude only(c) Variable frequency(d) Constant frequencyThe question was posed to me during an online interview.This is a very interesting question from Introduction to Oscillator in chapter Oscillators of Analog Circuits
Answer» RIGHT ANSWER is (d) Constant frequency To ELABORATE: Output of a stable oscillator have constant amplitude and frequency.

Discussion

10.	The output of oscillator will not depend upon ___________(a) Feedback(b) Amplifier(c) Both feedback and amplifier(d) Input voltageThis question was posed to me in an interview for internship.My doubt is from Introduction to Oscillator in division Oscillators of Analog Circuits
Answer» Correct option is (d) Input VOLTAGE Explanation: The OUTPUT of the OSCILLATOR will not depend upon input voltage. There is no input voltage for an oscillator.

Discussion

11.	Frequency of oscillation of alternator is ___________(a) 100Hz(b) 50Hz(c) 1KHz(d) 200HzThe question was asked during an interview for a job.My question is from Classification of Oscillator-1 in section Oscillators of Analog Circuits
Answer» The correct choice is (b) 50Hz Best explanation: Alternator frequency depends upon the speed of rotation and the number of PAIRS of ROTOR poles. When connected to a power system, ALTERNATORS are synchronized with the grid frequencies which is either 50/60Hz depending on the GEOGRAPHICAL LOCATION.

Discussion

12.	Oscillation can be classified as damped and sustained on the basis of varying.(a) Input power(b) Frequency(c) Amplitude(d) Noise marginThe question was asked in quiz.The query is from Classification of Oscillator-1 in division Oscillators of Analog Circuits
Answer» The CORRECT option is (c) AMPLITUDE For EXPLANATION I would SAY: Oscillation can be CLASSIFIED as damped and sustained on the basis of varying amplitude.

Discussion

13.	Damped oscillations are those oscillations which ___________ continuously with time.(a) Increasing(b) Decreasing(c) Increasing or decreasing(d) Neither increasing nor decreasingI got this question during a job interview.My query is from Classification of Oscillator-1 in portion Oscillators of Analog Circuits
Answer» Right CHOICE is (c) Increasing or decreasing Explanation: DAMPED OSCILLATIONS are those oscillations which DECREASE or INCREASES continuously with time.

Discussion

14.	Mark-to-space ratio is related with ___________(a) Saw-tooth generator(b) LC oscillator(c) RC oscillator(d) Crystal oscillatorI got this question during an online exam.My question comes from Classification of Oscillator-1 topic in chapter Oscillators of Analog Circuits
Answer» Right choice is (a) Saw-tooth generator Explanation: MSR or Mark-to-space ratio is related with saw-tooth generator. It is the ratio of WIDTH of pulse to TIME between pulses.

Discussion

15.	If the oscillation amplitude decreases continuously it is called ___________(a) Overdamped(b) Underdamped(c) Sustained(d) No specific nameThe question was posed to me in exam.The question is from Classification of Oscillator-1 topic in section Oscillators of Analog Circuits
Answer» The CORRECT answer is (b) Underdamped The explanation: If the oscillation amplitude DECREASES continuously it is CALLED underdamped oscillation.

Discussion

16.	Which of the following is not an example of sinusoidal oscillator?(a) RC phase shift oscillator(b) Weinbridge oscillator(c) Crystal oscillator(d) Blocking oscillatorI had been asked this question in class test.I'd like to ask this question from Classification of Oscillator-1 in section Oscillators of Analog Circuits
Answer» The correct choice is (d) Blocking oscillator Easy explanation: A blocking oscillator is a non-sinusoidal oscillator. It produces a FREE running signal-square SHAPED and requires only a RESISTOR, transformer and one amplifying element to work. The transistor is blocked off for most of the duty cycle, producing periodic PULSES.

Discussion

17.	The ratio of width of pulse to time between pulses are called ___________(a) PSRR(b) PSR(c) MSR(d) CMRRThis question was addressed to me in unit test.Enquiry is from Classification of Oscillator-1 topic in section Oscillators of Analog Circuits
Answer» Right answer is (c) MSR The EXPLANATION: The ratio of the WIDTH of pulse to time between PULSES is called MSR (Mark-to-Space ratio). Other abbreviation denotes PSRR (Power Supply Rejection Ratio), PSR (Power Supply Rejection), CMRR (Common Mode Rejection Ratio).

Discussion

18.	The time between one pulse to another is known as ___________(a) MSR(b) PRF(c) Time delay(d) PRTThis question was posed to me in an interview.My question comes from Classification of Oscillator-1 topic in chapter Oscillators of Analog Circuits
Answer» The correct ANSWER is (d) PRT Best explanation: The TIME between one PULSE to another is known as PRT (Power Repetition Time), other abbreviations denote PRF (Power Repetition Frequency), MSR (Mark-to-Space RATIO).

Discussion

19.	The inverse of pulse repetition time gives _____________(a) PRF(b) PRT(c) MSR(d) PSRThe question was posed to me in an online interview.Query is from Classification of Oscillator-1 in division Oscillators of Analog Circuits
Answer» The correct answer is (a) PRF Easy explanation: The inverse of pulse repetition time gives the PRF- pulse repetition frequency. MSR means mark to space RATIO, PRT means power repetition time, PSR is power supply rejection.

Discussion

20.	Which of the following is not an example of non-sinusoidal oscillator?(a) Sawtooth Generators(b) Blocking oscillators(c) Multivibrator(d) Crystal oscillatorsI have been asked this question in examination.My question is based upon Classification of Oscillator-2 in division Oscillators of Analog Circuits
Answer» The correct answer is (d) Crystal oscillators The explanation is: The sawtooth generator generates an output resembling the teeth of a plain toothed SAW. A blocking OSCILLATOR is a FREE running generator, used to PRODUCE narrow trigger pulses. A multivibrator is used to produce an output varying between 2 STATES- a high and low, producing square waves of a different duty cycle. A crystal oscillator is the only one of all used to produce sinusoidal signals.

Discussion

21.	Which of the following is not an LC oscillator?(a) Hartley Oscillator(b) Colpitts oscillator(c) Crystal oscillator(d) Clapp oscillatorThe question was posed to me during an internship interview.I want to ask this question from Classification of Oscillator-2 topic in section Oscillators of Analog Circuits
Answer» RIGHT choice is (C) Crystal oscillator Explanation: Crystal oscillator is not an LC oscillator because it does not CONTAIN any L or C.

Discussion

22.	The sinusoidal oscillator is also called ___________(a) LC oscillator(b) Harmonic oscillator(c) RC oscillator(d) Crystal oscillatorsThe question was posed to me in an international level competition.My enquiry is from Classification of Oscillator-2 in section Oscillators of Analog Circuits
Answer» Correct choice is (B) Harmonic oscillator The BEST I can EXPLAIN: SINUSOIDAL oscillators are called harmonic oscillators.

Discussion

23.	Low frequency oscillators have a frequency range of ___________(a) 20 Hz-20K Hz(b) 20 Hz -100k Hz(c) 1 Hz -20k Hz(d) 50 Hz -100k HzI got this question in semester exam.The origin of the question is Classification of Oscillator-2 topic in portion Oscillators of Analog Circuits
Answer» RIGHT answer is (B) 20 HZ -100k Hz To explain I would say: Low frequency oscillators are also CALLED Audio frequency oscillators. It operates in low frequencies, that is from 20Hz to 100-200KHz.

Discussion

24.	Which of the following oscillator is not using a feedback network for its oscillation?(a) LC oscillator(b) RC oscillator(c) Crystal oscillator(d) Relaxation oscillatorsI had been asked this question in my homework.My doubt is from Classification of Oscillator-2 topic in section Oscillators of Analog Circuits
Answer» Right answer is (d) Relaxation oscillators Best EXPLANATION: UJT relaxation oscillator doesn’t have a feedback system for oscillation.

Discussion

25.	Which type of oscillators is used in timing elements?(a) RC oscillator(b) LC oscillator(c) Crystal oscillator(d) Weinbridge oscillatorsThis question was posed to me in an online quiz.My question comes from Classification of Oscillator-2 topic in section Oscillators of Analog Circuits
Answer» Right ANSWER is (c) Crystal oscillator The explanation: Crystal oscillators are best SUITABLE for the USE in TIMING elements because of its high frequency stability. We can obtain PRECISE, high and stable frequency of operation. There is very low frequency drift over time.

Discussion

26.	High frequency oscillators have a frequency range of ___________(a) 300K Hz-2G Hz(b) 100k Hz-500k Hz(c) 8k Hz-800K Hz(d) 4K Hz-1G HzI had been asked this question in an interview for job.The above asked question is from Classification of Oscillator-2 in section Oscillators of Analog Circuits
Answer» Correct OPTION is (a) 300K Hz-2G Hz To elaborate: High frequency oscillators are also called RADIO frequency oscillators. It has a range of 300KHz to several MEGAHERTZ.

Discussion

27.	Which of the following oscillator is will give the most stable output oscillation frequency?(a) Colpitts oscillator(b) Clapp oscillator(c) Wein bridge oscillator(d) Crystal oscillatorThe question was asked by my school teacher while I was bunking the class.Enquiry is from Classification of Oscillator-2 topic in portion Oscillators of Analog Circuits
Answer» The CORRECT choice is (d) CRYSTAL oscillator To explain: Crystal oscillator gives the most stable oscillation. It is the only ONE not consisting of R, L, C elements and does not DETERIORATE over time easily. It provides high stability and precision over a range of frequencies.

Discussion

28.	Which of the following oscillator cannot be used in low frequency oscillations?(a) Wein bridge oscillators(b) RC phase shift oscillators(c) Colpitts oscillators(d) RC oscillatorsI got this question at a job interview.My doubt stems from Classification of Oscillator-2 in portion Oscillators of Analog Circuits
Answer» Correct ANSWER is (C) Colpitts oscillators The best explanation: Since Colpitts OSCILLATOR is an LC oscillator it cannot be used as a low frequency oscillator. Capacitor present provides a low reactance path to HF SIGNALS and thus provides excellent performance in the high frequency region, even in microwave.

Discussion

29.	RC phase shift oscillators contain a minimum of _________ Phase shift network.(a) 1(b) 2(c) 3(d) 0This question was posed to me in final exam.This intriguing question originated from RC Phaseshift Oscillator topic in division Oscillators of Analog Circuits
Answer» Correct answer is (c) 3 The explanation: RC phase shift oscillator contains a minimum of three phase shift NETWORKS. There can be also four and it increases the STABILITY of oscillation. They yield a pure SINE WAVE for a variety of loads.

Discussion

30.	Relaxation oscillators are also known as ___________(a) Multivibrator(b) Phase shift oscillators(c) Blocking oscillators(d) Saw tooth generatorI have been asked this question in an internship interview.My question is based upon Classification of Oscillator-2 in division Oscillators of Analog Circuits
Answer» CORRECT ANSWER is (a) Multivibrator Easy EXPLANATION: Relaxation OSCILLATORS are also called MULTIVIBRATORS.

Discussion

31.	One phase shift network of an RC phase shift oscillator contain __________ capacitor.(a) 1(b) 2(c) 3(d) 0The question was asked during an interview for a job.The doubt is from RC Phaseshift Oscillator in division Oscillators of Analog Circuits
Answer» RIGHT answer is (a) 1 To EXPLAIN I would say: One phase shift network of an RC phase shift oscillator contains one capacitor and one resistor. This single network causes a phase shift of 60° and a TOTAL of 180° through the amplifier stage and 180° through the second INVERTING stage, a total of 0.

Discussion

32.	The phase shift network will produce a phase shift of 180 degrees at ___________(a) Three different frequencies(b) One frequency(c) Two different frequencies(d) Infinitely many frequenciesI had been asked this question at a job interview.My question is based upon RC Phaseshift Oscillator in section Oscillators of Analog Circuits
Answer» Right option is (b) ONE frequency To explain: The phase SHIFT oscillator will produce a phase shift of 180 degrees only at a particular frequency by which it is MEANT to oscillate.

Discussion

33.	One phase shift network of an RC phase contain __________ resistor.(a) 1(b) 2(c) 3(d) 0The question was asked during an online interview.The query is from RC Phaseshift Oscillator topic in chapter Oscillators of Analog Circuits
Answer» The CORRECT answer is (a) 1 Easy EXPLANATION: One phase shift network of an RC phase shift oscillator contains one capacitor and one resistor. This single network causes a phase shift of 60° and a total of 180° through the AMPLIFIER stage and 180° through the SECOND inverting stage, a total of 0.

Discussion

34.	One phase shift network of an RC phase contain _________ inductor.(a) 1(b) 2(c) 3(d) 0This question was posed to me during a job interview.This interesting question is from RC Phaseshift Oscillator in chapter Oscillators of Analog Circuits
Answer» The correct option is (d) 0 Easy explanation: One phase SHIFT NETWORK of an RC phase shift oscillator CONTAINS one CAPACITOR and one resistor. There is no need of an inductor.

Discussion

35.	Total phase shift provided by all phase shift networks in RC phase shift oscillator is ___________(a) 180 degrees(b) 60 degrees(c) 120 degrees(d) 360 degreesThe question was posed to me during an interview.My enquiry is from RC Phaseshift Oscillator topic in chapter Oscillators of Analog Circuits
Answer» Correct answer is (a) 180 degrees For explanation I would SAY: To satisfy BARKHAUSEN’s CRITERIA total phase shift should be 360 degrees. 180 degrees is PRODUCED by amplifier and rest by phase shift network even it is three stage or four stage.

Discussion

36.	Phase shift provided by one phase shift network in RC phase shift oscillator in 3 stage is ___________(a) 180 degrees(b) 60 degrees(c) 120 degrees(d) 90 degreesThis question was posed to me in an interview for job.This intriguing question comes from RC Phaseshift Oscillator topic in section Oscillators of Analog Circuits
Answer» The correct choice is (B) 60 degrees To EXPLAIN: Phase shift provided by one phase shift oscillator in RC phase shift oscillator in 3 STAGE is 60 degrees. It is 180/number of STAGES.

Discussion

37.	Amplifier gain for RC phase shift oscillation, to obey Barkhausen’s criteria should be minimum of ___________(a) 43(b) 4(c) 10(d) 29I had been asked this question by my school principal while I was bunking the class.My question is based upon RC Phaseshift Oscillator in chapter Oscillators of Analog Circuits
Answer» Right ANSWER is (d) 29 To EXPLAIN: Amplifier GAIN should be a MINIMUM of 29 or else Aβ will be LESS than one.

Discussion

38.	Which of the following is not a reason for beginning oscillations in RC phase shift oscillator?(a) Phase shift network(b) Noise inherent in transistor(c) Minor variations in the voltage DC source(d) Square wave signalThis question was addressed to me during an interview.My query is from RC Phaseshift Oscillator topic in section Oscillators of Analog Circuits
Answer» Right option is (a) Phase shift network For explanation: Phase shift network doesn’t INITIALIZE the oscillation it just phase shift a given FREQUENCY. Oscillation will start by noise inherent of transistor or by minor VOLTAGE variations in DC source.

Discussion

39.	Frequency of oscillation for three section RC phase shift network is given by ___________(a) 1/(ᴨ√6 RC)(b) 2/(ᴨ√6 RC)(c) 1/(2ᴨ√6 RC)(d) 1/(2√6 RC)The question was posed to me in final exam.I need to ask this question from RC Phaseshift Oscillator in portion Oscillators of Analog Circuits
Answer» RIGHT choice is (c) 1/(2ᴨ√6 RC) For explanation: For an RC PHASE SHIFT oscillator the frequency formula is 1/2πRC√2N where N is the total number of RC stages. For a 3 stage CIRCUIT, the frequency is 1/2πRC√6.

Discussion

40.	Distortion level in the output of RC phase shift network will be less than ___________(a) 1%(b) 2%(c) 5%(d) 10%This question was addressed to me in examination.Enquiry is from RC Phaseshift Oscillator topic in portion Oscillators of Analog Circuits
Answer» Correct choice is (C) 5% For EXPLANATION: Distortion in the output of phase SHIFT OSCILLATOR is less 5%.

Discussion

41.	Phase shift provided by one phase shift network in RC phase shift network in 4-stage will be ___________(a) 180 degrees(b) 45 degrees(c) 60 degrees(d) 90 degreesI have been asked this question during an interview for a job.I want to ask this question from RC Phaseshift Oscillator in division Oscillators of Analog Circuits
Answer» RIGHT choice is (b) 45 degrees To EXPLAIN: PHASE SHIFT provided by one phase shift oscillator in RC phase shift oscillator in 4 stage is 45degrees. It is 180/number of stages.

Discussion

42.	The feedback factor for RC phase shift oscillator is ___________(a) 1/18(b) 1/29(c) 1/11(d) 1/33The question was posed to me in class test.This interesting question is from RC Phaseshift Oscillator topic in chapter Oscillators of Analog Circuits
Answer» The correct CHOICE is (b) 1/29 The explanation: The feedback factor for RC phase shift oscillator is 1/29 and to satisfy BARKHAUSEN’s criteria amplifier gain should be greater than 29.

Discussion

43.	What will be oscillator frequency, if phase shift network of 3stages of RC phase shift oscillator contains a capacitor of 7nF and a resistance of 10K in each stage?(a) 928 Hz(b) 1KHz(c) 1.2KHz(d) 895HzI have been asked this question in an interview for internship.Asked question is from RC Phaseshift Oscillator topic in division Oscillators of Analog Circuits
Answer» CORRECT OPTION is (a) 928 Hz To explain I WOULD say: OSCILLATOR frequency can be given by the equation .

Discussion

44.	Which of the following is not true for an RC phase shift oscillator?(a) Not Bulky(b) Less costly(c) Effective for oscillation less than 10KHz(d) Pure sine wave output is possibleI have been asked this question in an interview.Question is from RC Phaseshift Oscillator topic in portion Oscillators of Analog Circuits
Answer» Correct option is (d) PURE sine wave OUTPUT is possible The BEST I can explain: Since only ONE frequency can fulfill barkhausen’s criteria requirement POSITIVE feedback occurs only for one frequency. Hence pure sine wave is not possible.

Discussion

45.	Which of these is incorrect for a Wien Bridge oscillator?(a) Low distortion(b) Good stability at the resonant frequency(c) Difficult to tune(d) Based on frequency selective form of a Wheatstone bridgeI got this question in an interview for internship.I need to ask this question from Weinbridge Oscillator in chapter Oscillators of Analog Circuits
Answer» Right ANSWER is (C) Difficult to TUNE Easiest explanation: A Wien Bridge OSCILLATOR is a two-stage RC coupled AMPLIFIER circuit that has good stability at the resonant frequency. It has low distortion and is easy to tune. It is called so because the circuit is based on a frequency-selective form of the Wheatstone bridge.

Discussion

46.	At the resonant frequency, what is the phase shift for the output in a Wien Bridge oscillator?(a) 0°(b) 45°(c) 90°(d) 180°I had been asked this question during an interview for a job.I'm obligated to ask this question of Weinbridge Oscillator topic in portion Oscillators of Analog Circuits
Answer» Right choice is (a) 0° The best explanation: The Wien BRIDGE oscillator USES a feedback circuit which consists of a SERIES RC circuit which is connected with a parallel RC network, producing a PHASE delay or phase advance circuit depending on the frequency, which is however 0° at the resonant frequency.

Discussion

47.	Recommended frequency range of Harley oscillator is __________(a) 30KHz-30MHz(b) 1KHz-10MHz(c) 2Hz-3MHz(d) 0.5KHz-40MHzI got this question during an interview for a job.Enquiry is from Hartley Oscillator-1 topic in section Oscillators of Analog Circuits
Answer» The CORRECT choice is (a) 30KHz-30MHz Easiest EXPLANATION: RECOMMENDED frequency range of the Hartley oscillator is 30KHz-30MHz. FREQUENCIES higher or lower than this range will cause distortion.

Discussion

48.	Which of these is a disadvantage of the Wien Bridge oscillator?(a) It cannot fabricate a pure tune(b) Distortion observed in output is high(c) It cannot be used for high resistance values(d) There is no automatic gain controlThis question was addressed to me by my school teacher while I was bunking the class.This intriguing question originated from Weinbridge Oscillator in division Oscillators of Analog Circuits
Answer» Right choice is (c) It cannot be used for high resistance values To EXPLAIN I WOULD say: A Wien Bridge oscillator provides a stable low distortion output over a WIDE range of frequency. However, the number of components required is high and the WHEATSTONE bridge APPLIED cannot be used for high resistance values.

Discussion

49.	In a Wien bridge oscillator, it is found that at the frequency ωO there is no phase shift in RF/R gain loop and the phase shift of the amplifier is also zero. Then what is the equation for the radian frequency, given R1, C1 is the series network of bridge and R2, C2 is the parallel network?(a) ωO=1/R1C1(b) ωO=1/R2C2(c) ωO=1/R1R2C1C2(d) ωO=1/RFC1RC2This question was posed to me in final exam.This intriguing question comes from Weinbridge Oscillator topic in division Oscillators of Analog Circuits
Answer» The correct choice is (C) ωO=1/R1R2C1C2 For EXPLANATION: For no phase SHIFT for the AMPLIFIER, the FREQUENCY of the output is given by ωO = 1/R1R2C1C2 and RF/R = C1/C2 + R2/R1. When R1=R2 and C1=C2 then RF = 2R.

Discussion

50.	For any Wien Bridge oscillator, R1 = R2 and C1 = C2 always in the bridge, provided the phase shift through the amplifier is zero.(a) True(b) FalseThis question was posed to me in a job interview.Enquiry is from Weinbridge Oscillator in chapter Oscillators of Analog Circuits
Answer» Right OPTION is (b) False Easy explanation: The bridge circuit is USED as feedback for the oscillator, provided that phase SHIFT through the amplifier is zero. At this point the bridge has to be balanced, HOWEVER not NECESSARILY that R1 = R2 and C1 = C2. This condition is just a case of the bridge being balanced.

Discussion

Explore topic-wise InterviewSolutions in .

Oscillators are used to ______ AC voltage.(a) Prevent(b) Generate(c) Amplify(d) RectifyI had been asked this question by my school principal while I was bunking the class.I want to ask this question from Introduction to Oscillator topic in section Oscillators of Analog Circuits

The AC power of output signal is obtained by ___________(a) Input AC voltage(b) Input DC voltage(c) DC biasing voltage(d) Power is generated by transistor itselfI had been asked this question in unit test.My doubt is from Introduction to Oscillator in section Oscillators of Analog Circuits

The output of oscillator will not depend upon ___________(a) Feedback(b) Amplifier(c) Both feedback and amplifier(d) Input voltageThis question was posed to me in an interview for internship.My doubt is from Introduction to Oscillator in division Oscillators of Analog Circuits

Frequency of oscillation of alternator is ___________(a) 100Hz(b) 50Hz(c) 1KHz(d) 200HzThe question was asked during an interview for a job.My question is from Classification of Oscillator-1 in section Oscillators of Analog Circuits

Oscillation can be classified as damped and sustained on the basis of varying.(a) Input power(b) Frequency(c) Amplitude(d) Noise marginThe question was asked in quiz.The query is from Classification of Oscillator-1 in division Oscillators of Analog Circuits

Mark-to-space ratio is related with ___________(a) Saw-tooth generator(b) LC oscillator(c) RC oscillator(d) Crystal oscillatorI got this question during an online exam.My question comes from Classification of Oscillator-1 topic in chapter Oscillators of Analog Circuits

If the oscillation amplitude decreases continuously it is called ___________(a) Overdamped(b) Underdamped(c) Sustained(d) No specific nameThe question was posed to me in exam.The question is from Classification of Oscillator-1 topic in section Oscillators of Analog Circuits

The ratio of width of pulse to time between pulses are called ___________(a) PSRR(b) PSR(c) MSR(d) CMRRThis question was addressed to me in unit test.Enquiry is from Classification of Oscillator-1 topic in section Oscillators of Analog Circuits

The time between one pulse to another is known as ___________(a) MSR(b) PRF(c) Time delay(d) PRTThis question was posed to me in an interview.My question comes from Classification of Oscillator-1 topic in chapter Oscillators of Analog Circuits

The inverse of pulse repetition time gives _____________(a) PRF(b) PRT(c) MSR(d) PSRThe question was posed to me in an online interview.Query is from Classification of Oscillator-1 in division Oscillators of Analog Circuits

The sinusoidal oscillator is also called ___________(a) LC oscillator(b) Harmonic oscillator(c) RC oscillator(d) Crystal oscillatorsThe question was posed to me in an international level competition.My enquiry is from Classification of Oscillator-2 in section Oscillators of Analog Circuits

Low frequency oscillators have a frequency range of ___________(a) 20 Hz-20K Hz(b) 20 Hz -100k Hz(c) 1 Hz -20k Hz(d) 50 Hz -100k HzI got this question in semester exam.The origin of the question is Classification of Oscillator-2 topic in portion Oscillators of Analog Circuits

Which type of oscillators is used in timing elements?(a) RC oscillator(b) LC oscillator(c) Crystal oscillator(d) Weinbridge oscillatorsThis question was posed to me in an online quiz.My question comes from Classification of Oscillator-2 topic in section Oscillators of Analog Circuits

High frequency oscillators have a frequency range of ___________(a) 300K Hz-2G Hz(b) 100k Hz-500k Hz(c) 8k Hz-800K Hz(d) 4K Hz-1G HzI had been asked this question in an interview for job.The above asked question is from Classification of Oscillator-2 in section Oscillators of Analog Circuits

RC phase shift oscillators contain a minimum of _________ Phase shift network.(a) 1(b) 2(c) 3(d) 0This question was posed to me in final exam.This intriguing question originated from RC Phaseshift Oscillator topic in division Oscillators of Analog Circuits

One phase shift network of an RC phase shift oscillator contain __________ capacitor.(a) 1(b) 2(c) 3(d) 0The question was asked during an interview for a job.The doubt is from RC Phaseshift Oscillator in division Oscillators of Analog Circuits

One phase shift network of an RC phase contain __________ resistor.(a) 1(b) 2(c) 3(d) 0The question was asked during an online interview.The query is from RC Phaseshift Oscillator topic in chapter Oscillators of Analog Circuits

One phase shift network of an RC phase contain _________ inductor.(a) 1(b) 2(c) 3(d) 0This question was posed to me during a job interview.This interesting question is from RC Phaseshift Oscillator in chapter Oscillators of Analog Circuits

Total phase shift provided by all phase shift networks in RC phase shift oscillator is ___________(a) 180 degrees(b) 60 degrees(c) 120 degrees(d) 360 degreesThe question was posed to me during an interview.My enquiry is from RC Phaseshift Oscillator topic in chapter Oscillators of Analog Circuits

Distortion level in the output of RC phase shift network will be less than ___________(a) 1%(b) 2%(c) 5%(d) 10%This question was addressed to me in examination.Enquiry is from RC Phaseshift Oscillator topic in portion Oscillators of Analog Circuits

The feedback factor for RC phase shift oscillator is ___________(a) 1/18(b) 1/29(c) 1/11(d) 1/33The question was posed to me in class test.This interesting question is from RC Phaseshift Oscillator topic in chapter Oscillators of Analog Circuits

At the resonant frequency, what is the phase shift for the output in a Wien Bridge oscillator?(a) 0°(b) 45°(c) 90°(d) 180°I had been asked this question during an interview for a job.I'm obligated to ask this question of Weinbridge Oscillator topic in portion Oscillators of Analog Circuits

Recommended frequency range of Harley oscillator is __________(a) 30KHz-30MHz(b) 1KHz-10MHz(c) 2Hz-3MHz(d) 0.5KHz-40MHzI got this question during an interview for a job.Enquiry is from Hartley Oscillator-1 topic in section Oscillators of Analog Circuits

For any Wien Bridge oscillator, R1 = R2 and C1 = C2 always in the bridge, provided the phase shift through the amplifier is zero.(a) True(b) FalseThis question was posed to me in a job interview.Enquiry is from Weinbridge Oscillator in chapter Oscillators of Analog Circuits