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101.	The measure of frequency change due to non- ideal load is called ____________(a) Frequency pulling(b) Frequency ratio(c) Output ratio(d) Frequency pushingThe question was posed to me by my college professor while I was bunking the class.The question is from Crystal Oscillator-2 in section Oscillators of Analog Circuits
Answer» The correct answer is (a) Frequency PULLING To elaborate: The MEASURE of frequency change due to NON- ideal load is called frequency pulling.

102.	The crystal resonator frequency will change according to operating time, this phenomenon is termed as ___________(a) Magnus effect(b) Retrace(c) Aging(d) Moore’s effectI got this question in my homework.Question is taken from Crystal Oscillator-2 topic in portion Oscillators of Analog Circuits
Answer» Right choice is (c) Aging The best I can explain: Aging is the LONG term FREQUENCY drift of an OSCILLATOR. It occurs DUE to its operation circumstances and duration of power off storage. Contamination of the mass of the crystal affects the aging, as WELL as excess mechanical stress on the crystal over time.

103.	The frequency variation error occurred when crystal is re-powered after several hours is termed as ___________(a) Magnus effect(b) Retrace(c) Aging(d) Moore’s effectThis question was posed to me in an interview for job.This intriguing question comes from Crystal Oscillator-2 topic in division Oscillators of Analog Circuits
Answer» CORRECT ANSWER is (b) RETRACE Best EXPLANATION: When power is removed from an oscillator for several hours, then re-applied on it again, the frequency of this oscillator will STABILIZE at a slightly different value. This frequency variation error is called retrace error.

104.	Measure of sensitivity of crystal oscillator output frequency to supply voltage is called ___________(a) Frequency pulling(b) Frequency ratio(c) Output ratio(d) Frequency pushingThis question was posed to me by my school teacher while I was bunking the class.Asked question is from Crystal Oscillator-2 in chapter Oscillators of Analog Circuits
Answer» The correct answer is (d) Frequency pushing Explanation: Every oscillator NEEDS a supply and the operating frequency is DEPENDENT on that voltage. As the DC supply changes, the output frequency may ALSO change and this is called frequency pushing. Frequency pulling is the change in output frequency DUE to change in APPLIED load.

105.	Which of the following parameter refer to maximum available tuning voltage to the required tuning-frequency range?(a) Oscillator turning port noise(b) Oscillator reference noise(c) Power supply noise(d) Vibration induced noiseI have been asked this question in an interview for internship.I'm obligated to ask this question of Crystal Oscillator-2 topic in chapter Oscillators of Analog Circuits
Answer» Right CHOICE is (a) Oscillator TURNING PORT noise To explain I would say: maximum available TUNING voltage to the required tuning-frequency range Is indicated by Oscillator turning port noise.

106.	Which of the following noise is caused due to sensitivity to an acceleration of crystal?(a) Oscillator reference noise(b) Oscillator turning port noise(c) Power supply noise(d) Vibration induced noiseThe question was asked during a job interview.My enquiry is from Crystal Oscillator-2 topic in chapter Oscillators of Analog Circuits
Answer» CORRECT ANSWER is (d) Vibration induced noise The explanation is: Quartz crystal oscillator frequency changes slightly when accelerated. This means that random and periodic MECHANICAL vibrations in the DEVICE can cause significant PHASE noise in the outpu

107.	Clapp oscillator is an ___________(a) LC oscillator(b) RC oscillator(c) RL oscillator(d) Crystal oscillatorThis question was addressed to me by my college director while I was bunking the class.This intriguing question originated from Clapp Oscillator topic in chapter Oscillators of Analog Circuits
Answer» The CORRECT answer is (a) LC oscillator The EXPLANATION is: Clapp oscillator is a COLPITTS oscillator which has an extra capacitor series with an inductor. Hence it is an LC oscillator, with 3 CAPACITORS and one single inductor to set its frequency,and the clap circuit is often used as a variable frequency oscillator, by MAKING one capacitor variable.

108.	Which type of feedback is used in clapp oscillator?(a) Positive feedback(b) Negative feedback(c) No feedback is used(d) Both positive and negative feedbackThis question was addressed to me in a job interview.I'd like to ask this question from Clapp Oscillator topic in division Oscillators of Analog Circuits
Answer» Right OPTION is (a) Positive feedback Easy explanation: Positive feedback is present in the clap oscillator, where in the three capacitors form a VOLTAGE DIVIDER which determines amount of feedback being APPLIED to transistor input.

109.	When constructing variable frequency oscillator among clapp oscillator and colpitts oscillator which one is preferred?(a) Colpitts oscillator(b) Clapp oscillator(c) Both of them have equal preference(d) None of them prefferedI got this question by my school principal while I was bunking the class.Question is taken from Clapp Oscillator topic in section Oscillators of Analog Circuits
Answer» Correct answer is (b) Clapp oscillator Explanation: The STRAY third capacitor in the clap oscillator doesn’t have a negative EFFECT and the frequency OBTAINED is instead more stable and accurate than COLPITT oscillator, hence the clap oscillator is preferred for a VARIABLE frequency oscillator.

110.	In clapp oscillator voltage is divided by using __________(a) Resistors(b) Capacitors(c) Inductors(d) Voltage dividing circuits are not usedThis question was addressed to me in class test.Question is taken from Clapp Oscillator in division Oscillators of Analog Circuits
Answer» RIGHT answer is (b) Capacitors Explanation: In CLAP capacitor voltage divider CIRCUIT is achieved by capacitor because it is a modified VERSION of COLPITTS oscillator.

111.	In a clapp oscillator with three capacitor C1, C2, C3, C1 is used as upper capacitor in voltage divider, C2 is used as lower capacitor in voltage divider and C3 is the third capacitor. For perfect operation which of these capacitor should have minimum value?(a) C1(b) C2(c) C3(d) All of them are equalI have been asked this question in exam.The doubt is from Clapp Oscillator topic in section Oscillators of Analog Circuits
Answer» Right ANSWER is (C) C3 Best explanation: In a Clapp oscillator C3 is much smaller than C1 and C 2as a result, the equivalent CAPACITANCE C is APPROXIMATELY EQUAL to C3. For perfect operation C3 should have minimum value.

112.	In a clapp oscillator with three capacitor C1, C2, C3, C1 is used as upper capacitor in voltage divider, C2 is used as lower capacitor in voltage divider and C3 is the third capacitor. For perfect operation of clapp oscillator value of C3 should be __________(a) Equal to C1(b) Equal to C2(c) Equal to C1 parallel C2(d) Very smallThe question was asked during an online interview.This key question is from Clapp Oscillator topic in section Oscillators of Analog Circuits
Answer» Correct choice is (c) Equal to C1 PARALLEL C2 Easy explanation: For perfect operation of clapp oscillator VALUE of C3 should be C1 parallel C2.

113.	In the following oscillator which one is more accurate?(a) Colpitts oscillator(b) Clapp oscillator(c) Hartley oscillator(d) Simple LC oscillatorThe question was posed to me during an interview for a job.The question is from Clapp Oscillator in section Oscillators of Analog Circuits
Answer» Right answer is (b) Clapp OSCILLATOR For explanation: The STRAY third capacitor in the clap oscillator doesn’t have a NEGATIVE EFFECT and the FREQUENCY obtained is instead more stable and accurate than colpitt oscillator.

114.	What will be the clapp oscillator frequency if the C1, C2, C3 of clap oscillator is 1μF, 1μF, 2μF respectively and inductance is 1μH?(a) 0.1MHz(b) 0.4MHz(c) 1MHz(d) 4MHzI had been asked this question by my school teacher while I was bunking the class.My doubt is from Clapp Oscillator in section Oscillators of Analog Circuits
Answer» Right answer is (b) 0.4MHz Explanation: FREQUENCY of CLAP OSCILLATOR is= 3.9 x 10^5ie approximately 0.4MHz. Therefore, frequency is equal to .

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