InterviewSolution
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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. |
Which of the following requires a synchronizing signal?(a) Single channel PPM system(b) PAM(c) DM(d) All of the mentionedThe question was posed to me during an online interview.Enquiry is from PAM,PWM and TDM in section Modulation and Coding Trade-off of Digital Communications |
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Answer» The CORRECT option is (b) PAM |
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| 2. |
The use of non uniform quantization leads to(a) Reduction in transmission bandwidth(b) Increase in maximum SNR(c) Increase in SNR for low level signals(d) Simplification of quantization processThe question was asked in final exam.This intriguing question originated from PAM,PWM and TDM in section Modulation and Coding Trade-off of Digital Communications |
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Answer» Right option is (c) Increase in SNR for LOW LEVEL SIGNALS |
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| 3. |
QAM uses ______ as the dimensions.(a) In phase(b) Quadrature(c) In phase & Quadrature(d) None of the mentionedI have been asked this question during an online exam.The question is from Modulation Techniques topic in division Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT option is (C) In PHASE & QUADRATURE Explanation: QAM uses in phase and quadrature which is cosine and sine respectively as the dimensions. |
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| 4. |
Which system uses QAM?(a) Digital microwave relay(b) Dial up modem(c) Digital microwave relay & Dial up modem(d) None of the mentionedI got this question in an online quiz.Origin of the question is Modulation Techniques topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» Correct answer is (c) DIGITAL microwave RELAY & DIAL up modem |
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| 5. |
Which is called as on-off keying?(a) Amplitude shift keying(b) Uni-polar PAM(c) Amplitude shift keying & Uni-polar PAM(d) None of the mentionedThe question was posed to me in examination.This intriguing question comes from Modulation Techniques in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct option is (c) AMPLITUDE SHIFT keying & Uni-polar PAM |
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| 6. |
Simulation is used to determine(a) Bit error rate(b) Symbol error rate(c) Bit error(d) Symbol errorThe question was asked in class test.Question is taken from Modulation Techniques topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» Right answer is (a) BIT error rate |
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| 7. |
If we correlate the received signal with both orthogonal function the inner product will be(a) In phase(b) Quadrature(c) In phase and quadrature(d) UnityThe question was asked in an internship interview.I need to ask this question from Modulation Techniques in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» The CORRECT answer is (c) In phase and quadrature |
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| 8. |
Matched filter is a _____ technique.(a) Modulation(b) Demodulation(c) Modulation & Demodulation(d) None of the mentionedI have been asked this question during an online exam.This question is from Modulation Techniques topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» The CORRECT ANSWER is (B) Demodulation |
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| 9. |
Every frequency has ____ orthogonal functions.(a) One(b) Two(c) Four(d) SixI have been asked this question during an online interview.My question comes from Modulation Techniques topic in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct CHOICE is (b) Two |
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| 10. |
If we correlate the received signal with any one of the two orthogonal function, the obtained inner product will be(a) In phase(b) Quadrature(c) Zero(d) Cannot be determinedThis question was posed to me in an interview for job.This question is from Modulation Techniques in division Modulation and Coding Trade-off of Digital Communications |
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Answer» Right answer is (c) Zero |
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| 11. |
In non coherent reception _____ is measured.(a) Phase(b) Energy(c) Power(d) None of the mentionedThe question was asked during an interview.I need to ask this question from Modulation Techniques topic in division Modulation and Coding Trade-off of Digital Communications |
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| 12. |
FSK reception uses(a) Correlation receiver(b) PLL(c) Correlation receiver & PLL(d) None of the mentionedThis question was posed to me in unit test.My query is from Modulation Techniques topic in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» Right answer is (c) Correlation RECEIVER & PLL |
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| 13. |
FSK reception is(a) Phase Coherent(b) Phase non coherent(c) Phase Coherent & non coherent(d) None of the mentionedThe question was posed to me in examination.This question is from Modulation Techniques topic in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT option is (C) Phase Coherent & NON coherent Easiest explanation: RECEPTION of FSK can be either phase coherent or phase non coherent. |
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| 14. |
Which FSK has no phase discontinuity?(a) Continuous FSK(b) Discrete FSK(c) Uniform FSK(d) None of the mentionedThe question was asked in an interview for job.Origin of the question is Modulation Techniques in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» RIGHT option is (a) Continuous FSK To EXPLAIN I would SAY: Continuous frequency shift KEYING has no phase DISCONTINUITY between symbols. |
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| 15. |
Average energy per bit is given by(a) average energy symbol/log2 M(b) average energy symbol * log2 M(c) log2 M/ Average energy symbol(d) none of the mentionedI got this question during an interview.Query is from Modulation Techniques topic in division Modulation and Coding Trade-off of Digital Communications |
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Answer» Right option is (a) average energy symbol/LOG2 M |
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| 16. |
Entropy of N random variables is the _____ of the entropy of individual random variable.(a) Sum(b) Product(c) Sum of squares(d) AverageThe question was posed to me in an interview for job.The origin of the question is Modulation and Entropy in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» Right ANSWER is (a) Sum |
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| 17. |
Entropy calculation returns(a) Random variable(b) Deterministic number(c) Random number(d) None of the mentionedI had been asked this question in homework.Question is from Modulation and Entropy topic in section Modulation and Coding Trade-off of Digital Communications |
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Answer» Correct answer is (b) DETERMINISTIC number |
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| 18. |
In TDM, at the receiver end, ____ filter is used.(a) Low pass(b) High pass(c) Band pass(d) Band stopThis question was addressed to me in final exam.My query is from Modulation and Entropy in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» RIGHT choice is (a) Low PASS For explanation: In TDM, at the receiver END low pass FILTERING is done to obtain individual signals. |
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| 19. |
Which provides more secure communication?(a) CDMA(b) FDMA(c) TDMA(d) None of the mentionedThe question was asked by my college director while I was bunking the class.Asked question is from Modulation and Entropy in division Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT choice is (a) CDMA For EXPLANATION I would SAY: CDMA PROVIDES more secure COMMUNICATION than TDMA and FDMA. |
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| 20. |
Time division multiplexing uses(a) High pass filter(b) Commutator(c) High pass filter & Commutator(d) None of the mentionedI had been asked this question in an international level competition.This interesting question is from Modulation and Entropy in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT answer is (B) Commutator Best EXPLANATION: Time division multiplexing uses low pass filter and commutator. |
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| 21. |
Which has higher error probability performance?(a) Uni-polar base-band signalling(b) Bipolar base-band signalling(c) ASK(d) FSKI got this question by my school teacher while I was bunking the class.Enquiry is from Modulation and Entropy in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct choice is (b) Bipolar base-band SIGNALLING |
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| 22. |
Which has same probability of error?(a) ASK and FSK(b) ASK and PSK(c) PSK and FSK(d) None of the mentionedI had been asked this question in an interview for job.This intriguing question originated from Modulation and Entropy in section Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT answer is (C) PSK and FSK Best explanation: Uni-polar base-band signalling, PSK and FSK has same probability of error. |
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| 23. |
Modulation process corresponds to ______ the amplitude, frequency or phase.(a) Switching(b) Keying(c) Switching or keying(d) None of the mentionedThis question was addressed to me during an internship interview.I want to ask this question from Modulation and Entropy topic in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» Right OPTION is (C) Switching or keying |
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| 24. |
Matched filter(a) Is a non linear filter(b) Produces maximum output SNR(c) All of the mentioned(d) None of the mentionedThe question was posed to me in unit test.I would like to ask this question from Modulation and Entropy topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» Right choice is (b) PRODUCES MAXIMUM output SNR |
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| 25. |
For which quantization process is used?(a) Amplitude discretization(b) Time discretization(c) Amplitude & Time discretization(d) None of the mentionedThe question was posed to me in quiz.The question is from Modulation and Entropy topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT OPTION is (a) Amplitude discretization The BEST explanation: Sampling process is USED for time discretization and QUANTIZATION process is used for amplitude discretization. |
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| 26. |
PCM includes the process of(a) Amplitude discretization(b) Time discretization(c) Amplitude & Time discretization(d) None of the mentionedThis question was addressed to me in a national level competition.This key question is from Modulation and Entropy in division Modulation and Coding Trade-off of Digital Communications |
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Answer» Right option is (C) Amplitude & TIME DISCRETIZATION |
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| 27. |
Operations performed by switching system(a) Path establishment(b) Information exchange(c) Tariff computation(d) All of the mentionedThis question was posed to me in an international level competition.I'm obligated to ask this question of Modulation and Multiplexing in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» Right ANSWER is (d) All of the mentioned |
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| 28. |
Analogue switches provides(a) Good bandwidth(b) Low distortion(c) Low cost(d) All of the mentionedThis question was posed to me during a job interview.I need to ask this question from Modulation and Multiplexing topic in section Modulation and Coding Trade-off of Digital Communications |
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| 29. |
In time division, connection is established using(a) Data exchange(b) Galvanic connection(c) Data exchange & Galvanic connection(d) None of the mentionedThe question was asked during an interview.Origin of the question is Modulation and Multiplexing topic in division Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct choice is (a) DATA EXCHANGE |
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| 30. |
In time division system, the actual switch is called as(a) Speech memory(b) Cross point(c) Connecting point(d) None of the mentionedI had been asked this question in a job interview.My question is taken from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications |
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| 31. |
Space division has dedicated(a) Paths(b) Time slots(c) Paths & Time slots(d) None of the mentionedI got this question in an interview for internship.Question is taken from Modulation and Multiplexing topic in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT option is (a) Paths Explanation: Space DIVISION has DEDICATED paths and time division has dedicated time slots. |
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| 32. |
Switching exists in(a) Point to point communication(b) Broadcast communication(c) Point to point & Broadcast communication(d) None of the mentionedI got this question in class test.The question is from Modulation and Multiplexing topic in section Modulation and Coding Trade-off of Digital Communications |
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Answer» The CORRECT choice is (a) Point to point communication |
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| 33. |
In channel encoding procedure(a) Redundancy bits are added(b) Errors are corrected(c) Redundancy bits are added & Errors are corrected(d) None of the mentionedThis question was addressed to me in an interview.Enquiry is from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications |
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Answer» RIGHT answer is (C) Redundancy BITS are added & Errors are corrected The explanation is: In channel encoding includes addition of redundancy to the SIGNAL such that any BIT errors can be corrected. |
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| 34. |
When probability of receiving a symbol is 1 then how much information will be obtained?(a) Little information(b) Much information(c) No information(d) None of the mentionedThis question was addressed to me in exam.My enquiry is from Modulation and Multiplexing topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» The CORRECT ANSWER is (C) No information |
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| 35. |
Modulation process includes(a) Analog to digital conversion(b) Digital to analog conversion(c) All of the mentioned(d) None of the mentionedThe question was posed to me in my homework.The question is from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications |
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Answer» Correct answer is (b) Digital to analog conversion |
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| 36. |
Source of noise in delta modulation is(a) Granularity(b) Slope overload(c) Granularity & Slope overload(d) None of the mentionedThe question was posed to me in an internship interview.This intriguing question originated from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications |
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Answer» RIGHT answer is (c) GRANULARITY & Slope overload The explanation is: Sources of NOISE in delta MODULATION are granularity and slope overload. |
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| 37. |
The demodulator in delta modulation technique is(a) Differentiator(b) Integrator(c) Quantizer(d) None of the mentionedThis question was posed to me in final exam.I'm obligated to ask this question of Modulation and Multiplexing topic in section Modulation and Coding Trade-off of Digital Communications |
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Answer» The CORRECT option is (b) Integrator |
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| 38. |
Delta modulation is ______ conversion.(a) Analog to digital(b) Digital to analog(c) Analog to digital and digital to analog(d) None of the mentionedThis question was posed to me in semester exam.My doubt stems from Modulation and Multiplexing in division Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct answer is (C) Analog to DIGITAL and digital to analog |
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| 39. |
In bipolar codes, pulses can be(a) Positive(b) Negative(c) Absent(d) All of the mentionedI got this question in a job interview.The above asked question is from Modulation and Multiplexing in section Modulation and Coding Trade-off of Digital Communications |
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Answer» Correct answer is (d) All of the mentioned |
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| 40. |
To achieve high signal to noise ratio, delta modulation must use(a) Under sampling(b) Over sampling(c) Aliasing(d) None of the mentionedI got this question in final exam.This interesting question is from Modulation and Multiplexing topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT option is (B) Over sampling Easiest explanation: To achieve high signal to noise ratio, delta modulation MUST USE over sampling techniques. |
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| 41. |
Properties used to determine stream’s fidelity(a) Sampling rate(b) Bit depth(c) Sampling rate & Bit depth(d) None of the mentionedThe question was asked by my college director while I was bunking the class.Question is from Modulation and Multiplexing topic in division Modulation and Coding Trade-off of Digital Communications |
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| 42. |
Which has the maximum power efficiency?(a) Class A(b) Class B(c) Class C(d) Class ABThe question was asked during an online interview.Origin of the question is M-ary Modulation and Amplifiers in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» Right option is (C) Class C |
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| 43. |
Class B linear amplifiers have maximum power efficiency of(a) 50%(b) 75%(c) 78.5%(d) None of the mentionedThe question was posed to me during a job interview.This interesting question is from M-ary Modulation and Amplifiers in division Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct choice is (c) 78.5% |
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| 44. |
An amplifier uses ______ to take input signal.(a) DC power(b) AC power(c) DC & AC power(d) None of the mentionedThis question was addressed to me in semester exam.This interesting question is from M-ary Modulation and Amplifiers topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT choice is (a) DC POWER To explain I would say: An amplifier USES DC power to take an input signal and increase its AMPLITUDE at the OUTPUT. |
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| 45. |
Which generates high distortion?(a) Class A(b) Class B(c) Class C(d) Class ABI have been asked this question during an interview.Enquiry is from M-ary Modulation and Amplifiers in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» Correct option is (c) Class C |
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| 46. |
Which has 50% maximum power efficiency?(a) Class A(b) Class B(c) Class AB(d) None of the mentionedI had been asked this question in an online quiz.My question comes from M-ary Modulation and Amplifiers topic in division Modulation and Coding Trade-off of Digital Communications |
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Answer» RIGHT CHOICE is (a) Class A Explanation: Class A AMPLIFIERS have 50% maximum POWER efficiency. |
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| 47. |
TDM requires(a) Constant data transmission(b) Transmission of data samples(c) Transmission of data at random(d) Transmission of data of only one measuredThis question was posed to me in an interview for job.My question comes from PAM,PWM and TDM in chapter Modulation and Coding Trade-off of Digital Communications |
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Answer» Correct OPTION is (B) TRANSMISSION of data samples |
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| 48. |
Which modulation technique have the same bit and symbol error probability?(a) BPSK(b) DPSK(c) OOK(d) All of the mentionedThis question was addressed to me during an online exam.This key question is from M-ary Modulation and Amplifiers topic in division Modulation and Coding Trade-off of Digital Communications |
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| 49. |
For non coherent reception of PSK _____ is used.(a) Differential encoding(b) Decoding(c) Differential encoding & Decoding(d) None of the mentionedThe question was posed to me in semester exam.This interesting question is from M-ary Modulation and Amplifiers topic in section Modulation and Coding Trade-off of Digital Communications |
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Answer» CORRECT answer is (c) Differential encoding & DECODING Easiest explanation: For non coherent RECEPTION of PSK, differential encoding is USED at the transmitter and decoding is used at the receiver. |
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| 50. |
In M-ary FSK as M tends to infinity, probability of error tends to(a) Infinity(b) Unity(c) Zero(d) None of the mentionedI had been asked this question in a job interview.The origin of the question is M-ary Modulation and Amplifiers topic in portion Modulation and Coding Trade-off of Digital Communications |
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Answer» The correct ANSWER is (C) Zero |
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