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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An electrical signal can be represented in either Thevenin form or Norton From. However, Thevenin representation is preferred when(a) The load resistance is very large as compared to the source resistance(b) The load resistance is very low compared to the source resistance(c) There is no preferred case.(d) Both of the cases mentioned are the preferred caseI got this question in final exam.I'd like to ask this question from Signals in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» CORRECT answer is (a) The load resistance is very LARGE as compared to the source resistance For explanation I WOULD say: a is preferred in Thevenin’s CASE and b in Norton’s case |
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| 2. |
Consider an N-bits ADC (Analog to Digital Converter) whose analog input varies from 0 to Vmax, then which of the following is not true?(a) The least significant bit correspond to a change of Vmax/2^N -1 in the analog signal(b) The resolution of the ADC is Vmax/2^N -1(c) The maximum error in the conversion (or quantization error) is Vmax/2(2^N -1)(d) None of the mentionedThe question was posed to me by my school principal while I was bunking the class.Enquiry is from Signals topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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| 3. |
Which of the following is not a classification of amplifiers on the basis of their frequency response?(a) Capacitively coupled amplifier(b) Direct coupled amplifier(c) Bandpass amplifier(d) None of the mentionedThe question was asked during a job interview.Question is taken from Frequency Response of Amplifier topic in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct OPTION is (d) NONE of the mentioned |
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| 4. |
Which is the Most Significant Bit and Least Significant Bit in this case?(a) MSB: bN, LSB: bN(b) MSB: bN, LSB: b1(c) MSB: b1, LSB: bN(d) MSB: b1, LSB: b1The question was asked during an interview.The question is from Signals in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» CORRECT ANSWER is (b) MSB: BN, LSB: b1 For explanation I WOULD say: LSB will have maximum resistance (hence least CONTRIBUTION to the total current) and MSB will have least resistance (Hence maximum contribution to the total current). |
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| 5. |
You are given two amplifiers, A and B, to connect in cascade between a 10-mV, 100-kΩ source (S) and a 100-Ω load (L). The amplifiers have voltage gain, input resistance, and output resistance as follows: for A, 100 V/V, 10 kΩ, 10 kΩ, respectively; for B, 1 V/V, 100 kΩ, 100 Ω, respectively. Your problem is to decide how the amplifiers should be connected so that the voltage gain is maximum.(a) SABL(b) SBAL(c) Both have the same voltage gain(d) None as neither combination is able to amplify the input signalI got this question in exam.My question comes from Circuit Models for Amplifier in division Signals and Amplifiers of Electronic Devices & Circuits |
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| 6. |
Which of the following isn’t true?(a) Both transformer and amplifier can provide voltage gain(b) Both transformer and amplifier can provide current gain(c) Both transformer and amplifier can provide power gain(d) None of the mentionedThe question was asked during an interview.My doubt stems from Amplifiers topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right option is (c) Both TRANSFORMER and amplifier can provide power gain |
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| 7. |
In a two element series circuit, the applied voltage and the resulting current are v(t) = 60 + 66 sin (1000t) V, i(t) = 2.3sin (1000t + 68.3) 3 A. The nature of the elements would be(a) RC(b) LC(c) RL(d) RRI had been asked this question in homework.This intriguing question comes from Sinusoidal Steady State Analysis topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT option is (a) RC To EXPLAIN I would SAY: RC circuit CAUSES a POSITIVE shift in the circuit. |
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| 8. |
Statement 1: Voltage gain of -5 means that the output voltage has been attenuated.Statement 2: Voltage gain of -5db means that the output voltage has been attenuated.(a) Statement 1 and Statement 2 are true(b) Statement 1 and Statement 2 are false(c) Only Statement 1 is true(d) Only Statement 2 is trueThe question was asked during an interview.The origin of the question is Amplifiers topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct choice is (d) Only STATEMENT 2 is true |
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| 9. |
What is the binary representation of 57?(a) 0011 1101(b) 0101 1001(c) 0111 1001(d) 0011 1001The question was posed to me in a national level competition.This interesting question is from Signals topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct ANSWER is (d) 0011 1001 |
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| 10. |
For vref = 10V, n = 6, and R= 5000 ohm, which of the following is true?(a) The maximum value of the output current is 1.9375 mA(b) The change in the output current if the LSB is changed from 0 to 1 is 0.03125 mA(c) The change in the output current is the MSB is change from 0 to 1 is 0.5 mA(d) None of the mentionedThe question was asked during an interview.This intriguing question comes from Signals in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct choice is (b) The CHANGE in the output current if the LSB is CHANGED from 0 to 1 is 0.03125 mA |
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| 11. |
Q = 2000 VAR, pf = 0.9 (leading). The power in complex form is(a) 4129.8j2000 VA(b) 2000j4129.8 VA(c) 2000j41.29.8 VA(d) 4129.8j2000 VAThe question was asked during an online interview.The above asked question is from Sinusoidal Steady State Analysis in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The CORRECT ANSWER is (d) 4129.8j2000 VA |
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| 12. |
Buffer amplifier needs to have(a) Low input resistance and low output resistance(b) High Input resistance and high output resistance(c) Low input resistance and high output resistance(d) High input resistance and low output resistanceI have been asked this question in an interview.This interesting question is from Circuit Models for Amplifier in chapter Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct option is (d) High input resistance and low output resistance |
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| 13. |
In compact disc (CD) audio technology, the signal is sampled at 44kHz. Each sample is represented by 16bits. What is the speed of the system in bits/second?(a) 1.34 bits/second(b) 2,750 bits/second(c) 704,000 bits/second(d) 1,441,792,000 bits/secondI have been asked this question in an online interview.Question is taken from Signals in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct option is (C) 704,000 bits/second |
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| 14. |
Consider a voltage amplifier having a frequency response of the low-pass STC type with a dc gain of 60 dB and a 3-dB frequency of 1000 Hz. Then the gain db at(a) f = 10 Hz is 55 db(b) f = 10 kHz is 45 db(c) f = 100 kHz is 25 db(d) f =1Mhz is 0 dbI have been asked this question in an internship interview.My question is based upon Frequency Response of Amplifier in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct answer is (d) F =1Mhz is 0 db |
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| 15. |
The signal to be amplified is current signal and the output desired is a voltage signal. Which of the following amplifier can perform this task?(a) Voltage amplifier(b) Current amplifier(c) Transconductance amplifier(d) Transresistance amplifierThe question was asked during an online interview.The origin of the question is Circuit Models for Amplifier in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct answer is (d) TRANSRESISTANCE AMPLIFIER |
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| 16. |
Symmetrically saturated amplifiers operating in clipping mode can be used to convert a sine wave to a(a) Square wave(b) Pseudo Square wave(c) Sawtooth wave(d) Triangular waveThe question was asked during a job interview.This interesting question is from Amplifiers topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right choice is (b) Pseudo Square wave |
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| 17. |
What will be the value of the output current io, if the digital signal is in the form of b1b2b3…bn(a) Vref/2R (b1/2+b2/4+ b3/8….+bn/(2^N))(b) 2Vref/R (b1/2+b2/4+ b3/8….+bn/(2^N))(c) Vref/R (b1/2+b2/4+ b3/8….+bn/(2^N))(d) none of the aboveThis question was posed to me in a job interview.My question is from Signals topic in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right OPTION is (C) Vref/R (b1/2+b2/4+ b3/8….+bn/(2^N)) |
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| 18. |
Which of the following is a characteristic of digital signal?(a) It takes quantized value(b) Its waveform is a continuous function(c) The maximum number of signals that can be produced by N bits is2^N-1(d) There is no loss of value after converting an analog signal to digital signalI have been asked this question in an internship interview.My question is from Signals in chapter Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT option is (a) It TAKES quantized VALUE To explain I would SAY: Digital signal is non continuous and has discrete sets of POSSIBLE value which it can take. |
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| 19. |
The voltage gain of the amplifier is 8 and the current gain is 7. The power gain of the amplifier is(a) 56 db(b) 17.481 db(c) 34.963 db(d) 1 dbThe question was asked in an internship interview.My query is from Amplifiers in chapter Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct choice is (b) 17.481 db |
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| 20. |
P = 269 W, Q = 150 VAR (capacitive). The power in the complex form is(a) 150 – j269 VA(b) 150 + j269 VA(c) 269 – j150 VA(d) 269 + j150 VAThis question was posed to me during an interview for a job.Origin of the question is Sinusoidal Steady State Analysis topic in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct option is (C) 269 – J150 VA |
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| 21. |
Under what condition can the circuit shown be called a compensated attenuator.(a) C1R1 = C2R2(b) C1R2 = C2R1(c) C1C2 = R1R2(d) R1 = 0I had been asked this question in class test.I would like to ask this question from Frequency Response of Amplifier topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right answer is (a) C1R1 = C2R2 |
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| 22. |
When a circuit is called compensated attenuator?(a) Transfer function is directly proportional to the frequency(b) Transfer function is inversely proportional to the frequency(c) Transfer function is independent of the frequency(d) Natural log of the transfer function is proportional to the frequencyThe question was asked in examination.I'd like to ask this question from Frequency Response of Amplifier topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» CORRECT ANSWER is (c) Transfer function is independent of the FREQUENCY Best explanation: Transfer function does not has frequency in its mathematical FORMULA. |
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| 23. |
An amplifier has a voltage gain of 40db. The value of AVO is(a) 10(b) 100(c) 20(d) 200The question was asked during an interview.This key question is from Circuit Models for Amplifier in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right option is (b) 100 |
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| 24. |
Which of the following is true?(a) Monolithic IC amplifiers are directly coupled or dc amplifiers(b) Televisions and radios use tuned amplifiers(c) Audio amplifiers have coupling capacitor amplifier(d) All of the mentionedI had been asked this question in an interview for internship.Query is from Frequency Response of Amplifier in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The CORRECT CHOICE is (d) All of the mentioned |
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| 25. |
The units of voltage gain is(a) It has no units, it is a ratio(b) Decibels (db)(c) All of the mentioned(d) None of the mentionedI have been asked this question in a job interview.My enquiry is from Amplifiers topic in chapter Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct OPTION is (a) It has no units, it is a ratio |
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| 26. |
A cosine wave voltage signal has a 10V RMS value and 60Hz frequency. Also at time, t=0, the value of the voltage signal is equal to its RMS value. Which of the following is the correct mathematical representation of the voltage signal?(a) 10 cos(60t)(b) 10 cos (120πt)(c) 14.14 cos(60t + π/4)(d) 14.14 cos(120πt + π/4)The question was asked in a job interview.My doubt is from Signals in portion Signals and Amplifiers of Electronic Devices & Circuits |
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| 27. |
If Av, Ai and Ap represents the voltage gain, current gain and power gain ratio of an amplifier which of the below is not the correct expression for the corresponding values in decibel?(a) Current gain: 20 log Ai db(b) Voltage gain: 20 log Av db(c) Power gain: 20 log Ap db(d) Power gain: 10 log ApThis question was posed to me by my school principal while I was bunking the class.My enquiry is from Amplifiers topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right option is (c) POWER GAIN: 20 log Ap db |
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| 28. |
The signal whose waveform is not effected by a linear circuit is(a) Triangular Waveform signal(b) Rectangular waveform signal(c) Sine/Cosine wave signal(d) Sawtooth waveform signalThis question was posed to me by my college director while I was bunking the class.Origin of the question is Frequency Response of Amplifier in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct ANSWER is (C) Sine/Cosine WAVE signal |
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| 29. |
The ideal values for the input resistance (Ri) and the output resistance (Ro) of a transconductance amplifier are(a) Ri = 0 and Ro = 0(b) Ri = ∞ and R0 = ∞(c) Ri = 0 and R0 = ∞(d) Ri = ∞ and Ri = 0This question was addressed to me in an interview for job.My enquiry is from Circuit Models for Amplifier in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT option is (B) Ri = ∞ and R0 = ∞ The explanation is: It is a DESIRED characteristics of TRANSCONDUCTANCE AMPLIFIER ideally. |
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| 30. |
An amplifier has a voltage gain of 100 V/V and a current gain of 1000A/A. the value of the power gain decibel is(a) 30 db(b) 40 db(c) 50 db(d) 60 dbI have been asked this question in an international level competition.The query is from Amplifiers topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct answer is (c) 50 db |
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| 31. |
An electrical signal can be represented in either Thevenin form or Norton From. However, Norton representation is preferred when(a) The load resistance is very large as compared to the source resistance(b) The load resistance is very low as compared to the source resistance(c) There is no preferred case(d) Both of the cases mentioned are the preferred caseI had been asked this question by my college director while I was bunking the class.My question is from Signals topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct choice is (b) The load RESISTANCE is very low as compared to the source resistance |
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| 32. |
In order to prevent distortion in the output signal after amplification, the input signal must be(a) Higher than the positive saturation level of the amplifier(b) Lower than the negative saturation level of the amplifier(c) Must lie with the negative and the positive saturation level of the amplifier(d) Both higher than the positive saturation level of the amplifier and lower than the negative saturation level of the amplifierI have been asked this question during an interview.My question is based upon Amplifiers topic in chapter Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct CHOICE is (c) Must lie with the negative and the positive saturation LEVEL of the amplifier |
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| 33. |
Single-time-constant (STC) networks are those networks that are composed of, or can be reduced to(a) One reactive component (L or C) and a resistance (R)(b) Only capacitive component (C) and resistance (R)(c) Only inductive component (L) and resistance (R)(d) Reactive components (L, C or both L and C) and resistance (R)I got this question in final exam.Query is from Frequency Response of Amplifier in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT choice is (a) One REACTIVE component (L or C) and a resistance (R) The EXPLANATION: STC has only one reactive component and one resistive component. |
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| 34. |
STC networks can be classified into two categories: low-pass (LP) and high-pass (HP). Then which of the following is true?(a) HP network passes dc and low frequencies and attenuate high frequency and opposite for LP network(b) LP network passes dc and low frequencies and attenuate high frequency and opposite for HP network(c) HP network passes dc and high frequencies and attenuate low frequency and opposite for LP network(d) LP network passes low frequencies only and attenuate high frequency and opposite for HP networkI got this question during an internship interview.The above asked question is from Frequency Response of Amplifier topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT option is (b) LP network passes dc and low FREQUENCIES and attenuate HIGH FREQUENCY and opposite for HP network To explain I would say: By definition a LP network allows dc current (or low frequency current) and an LP network does the opposite, that is, allows high frequency AC current. |
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| 35. |
The ratio of the open circuit voltage of a voltage amplifier (AV) to the short circuit transconductance of a (Gm) of a transconductance amplifier, given that both have the same value of the internal resistance (Ri) and the output resistance (R0), is(a) Ri(b) R0(c) 1/Ri(d) 1/R0This question was addressed to me in final exam.The origin of the question is Circuit Models for Amplifier in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT OPTION is (b) R0 Explanation: It is a STANDARD MATHEMATICAL relation. |
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| 36. |
What is meant by stability of the an amplified signal?(a) The amplified signal must have a finite amplitude(b) The amplified signal should not have self oscillation(c) The input and the output signal must be proportional(d) The ratio of the input and the output signal must be finiteI have been asked this question in an online quiz.My question is based upon Amplifiers in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Right answer is (b) The AMPLIFIED signal should not have self oscillation |
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| 37. |
Which of the following is true?(a) Coupling capacitors causes the gain to fall off at high frequencies(b) Internal capacitor of a device causes the gain to fall off at low frequencies(c) All of the mentioned(d) None of the mentionedThe question was posed to me in an online quiz.The query is from Frequency Response of Amplifier topic in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT CHOICE is (d) NONE of the mentioned To explain: Both the STATEMENTS are false. |
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| 38. |
The output voltage of a voltage amplifier has been found to decrease by 20% when a load resistance of 1 kΩ is connected. What is the value of the amplifier output resistance?(a) 50Ω(b) 200Ω(c) 250Ω(d) 350ΩI got this question during an interview for a job.I would like to ask this question from Circuit Models for Amplifier topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» The correct answer is (c) 250Ω |
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| 39. |
General representation of the frequency response curve is called(a) Bode Plot(b) Miller Plot(c) Thevenin Plot(d) Bandwidth PlotThe question was asked in semester exam.The doubt is from Frequency Response of Amplifier in division Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» Correct choice is (a) Bode PLOT |
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| 40. |
The ratio of the short circuit current gain of a current amplifier (Ai) to the open circuit voltage gain of a voltage amplifier (AV), given that both amplifiers have the same value of the input resistance (Ri) and output resistance (R0), is(a) Ri(b) Ro(c) Ri / R0(d) Ro / RiThe question was posed to me in homework.Asked question is from Circuit Models for Amplifier in section Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» RIGHT answer is (c) RI / R0 The explanation is: It is a STANDARD MATHEMATICAL relation. |
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| 41. |
In the bridge shown, Z1 = 300 ohm, Z2 = 400 – j300 ohm, Z3 = 200 + j100 ohm. The Z4 at balance is(a) 400 + j300 ohm(b) 400 – j300 ohm(c) j100 ohm(d) -j900 ohmI had been asked this question by my college director while I was bunking the class.This interesting question is from Sinusoidal Steady State Analysis topic in portion Signals and Amplifiers of Electronic Devices & Circuits |
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Answer» CORRECT answer is (b) 400 – j300 ohm To explain I would SAY: Use Z1 X Z4 = Z2 x Z3. |
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