2025 question paper
Principles of Communication Engineering
26 questions
Q1a. In amplitude modulation, the total bandwidth required is (i) fm (ii) 2fm (iii) fc + fm (iv) fc - fm20252m
Module 1: Analog Modulation
View this question on its own page →In amplitude modulation, the total bandwidth required is
(i) fm
(ii) 2fm
(iii) fc + fm
(iv) fc - fmQ1b. In FM, the parameter varied in proportion to the message signal is (i) Amplitude (ii) Frequency (iii) Phase only (iv) Amplitude and phase20252m
Module 1: Analog Modulation
View this question on its own page →In FM, the parameter varied in proportion to the message signal is
(i) Amplitude
(ii) Frequency
(iii) Phase only
(iv) Amplitude and phaseQ1c. SSB modulation saves (i) Power (ii) Bandwidth (iii) Both power and bandwidth (iv) Only modulation index20252m
Module 1: Analog Modulation
View this question on its own page →SSB modulation saves
(i) Power
(ii) Bandwidth
(iii) Both power and bandwidth
(iv) Only modulation indexQ1d. VSB modulation is mainly used in (i) AM radio (ii) FM radio (iii) TV video transmission (iv) Satellite uplink20252m
Module 1: Analog Modulation
View this question on its own page →VSB modulation is mainly used in
(i) AM radio
(ii) FM radio
(iii) TV video transmission
(iv) Satellite uplinkQ1e. BER stands for (i) Binary error range (ii) Bit energy ratio (iii) Bit error rate (iv) Bandwidth efficiency rate20252m
Module 2: Digital Modulation
View this question on its own page →BER stands for
(i) Binary error range
(ii) Bit energy ratio
(iii) Bit error rate
(iv) Bandwidth efficiency rateQ1f. The power spectral density of white noise is (i) Zero (ii) Constant (iii) Exponential (iv) Parabolic20252m
Module 3: Probability & Random Processes
View this question on its own page →The power spectral density of white noise is
(i) Zero
(ii) Constant
(iii) Exponential
(iv) ParabolicQ1g. Cyclic codes are represented using (i) Frequency response (ii) Generator polynomial (iii) Trellis diagram (iv) Fourier series20252m
Module 6: Information Coding and Decoding
View this question on its own page →Cyclic codes are represented using
(i) Frequency response
(ii) Generator polynomial
(iii) Trellis diagram
(iv) Fourier seriesQ1h. Error detection in block coding is based on (i) Modulation index (ii) Parity checking and syndrome (iii) Quantization noise (iv) Clock synchronization20252m
Module 6: Information Coding and Decoding
View this question on its own page →Error detection in block coding is based on
(i) Modulation index
(ii) Parity checking and syndrome
(iii) Quantization noise
(iv) Clock synchronizationQ1i. The minimum Hamming distance required for single-bit error correction is (i) 1 (ii) 2 (iii) 3 (iv) 420252m
Module 6: Information Coding and Decoding
View this question on its own page →The minimum Hamming distance required for single-bit error correction is
(i) 1
(ii) 2
(iii) 3
(iv) 4Q1j. Which modulation uses the position of a pulse to convey information? (i) PAM (ii) PCM (iii) PPM (iv) PWM20252m
Module 4: Pulse Modulation-I
View this question on its own page →Which modulation uses the position of a pulse to convey information?
(i) PAM
(ii) PCM
(iii) PPM
(iv) PWMQ2a. Explain in detail the frequency-domain representation of signals.20257m
Module 1: Analog Modulation
View this question on its own page →Explain in detail the frequency-domain representation of signals.
Q2b. Discuss Single Sideband (SSB) and Vestigial Sideband (VSB) modulation in detail.20257m
Module 1: Analog Modulation
View this question on its own page →Discuss Single Sideband (SSB) and Vestigial Sideband (VSB) modulation in detail.
Q3a. Explain Angle Modulation with representation of FM and PM signals.20257m
Module 1: Analog Modulation
View this question on its own page →Explain Angle Modulation with representation of FM and PM signals.
Q3b. Describe the generation and detection of FM.20257m
Module 1: Analog Modulation
View this question on its own page →Describe the generation and detection of FM.
Q4a. Explain the fundamentals of a digital communication system with a neat block diagram.20257m
Module 2: Digital Modulation
View this question on its own page →Explain the fundamentals of a digital communication system with a neat block diagram.
Q4b. Compare analog and digital communication systems.20257m
Module 2: Digital Modulation
View this question on its own page →Compare analog and digital communication systems.
Q5a. Describe the basic nomenclature used in digital communication.20257m
Module 2: Digital Modulation
View this question on its own page →Describe the basic nomenclature used in digital communication.
Q5b. Define power spectral density and bandwidth efficiency. Explain their importance in digital modulation.20257m
Module 2: Digital Modulation
View this question on its own page →Define power spectral density and bandwidth efficiency. Explain their importance in digital modulation.
Q6a. Explain the basics of probability and random processes used in communication systems.20257m
Module 3: Probability & Random Processes
View this question on its own page →Explain the basics of probability and random processes used in communication systems.
Q6b. What are pre-emphasis and de-emphasis networks? Explain their need in communication systems.20257m
Module 3: Probability & Random Processes
View this question on its own page →What are pre-emphasis and de-emphasis networks? Explain their need in communication systems.
Q7a. Explain the generation and detection of Pulse Amplitude Modulation (PAM).20257m
Module 4: Pulse Modulation-I
View this question on its own page →Explain the generation and detection of Pulse Amplitude Modulation (PAM).
Q7b. Compare PAM, PPM, and PCM in terms of bandwidth, noise immunity, complexity, and applications.20257m
Module 4: Pulse Modulation-I
View this question on its own page →Compare PAM, PPM, and PCM in terms of bandwidth, noise immunity, complexity, and applications.
Q8a. Explain Differential Pulse Code Modulation (DPCM) with a neat block diagram.20257m
Module 5: Pulse Modulation-II
View this question on its own page →Explain Differential Pulse Code Modulation (DPCM) with a neat block diagram.
Q8b. Describe Adaptive Delta Modulation (ADM) and explain how it reduces distortion.20257m
Module 5: Pulse Modulation-II
View this question on its own page →Describe Adaptive Delta Modulation (ADM) and explain how it reduces distortion.
Q9a. Explain the need for error detection and correction in digital communication systems.20257m
Module 6: Information Coding and Decoding
View this question on its own page →Explain the need for error detection and correction in digital communication systems.
Q9b. Describe Shannon-Fano and Huffman coding techniques. Compare their coding efficiencies.20257m
Module 6: Information Coding and Decoding
View this question on its own page →Describe Shannon-Fano and Huffman coding techniques. Compare their coding efficiencies.