B.TechSemester 42022-23Communication EngineeringKEC-401

Communication Engineering (KEC-401) - AKTU Question Paper 2022-23

B.Tech · Semester 4 · Free PDF Download

This is the official AKTU Communication Engineering Previous Year Question Paper for B.Tech Semester 4, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 4

Session:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Communication Engineering (KEC-401) — extracted question text

Section AAttempt all questions in brief. 2 x 10 = 20

a
Explain need of modulation in communication
b
Write down time convolution property of Fourier transform
c
Define frequency modulation and draw its output wa veform
d
Find the bandwidth of a frequency modulated signal having frequency deviation 30kHz and maximum message frequency is 500Hz
e
Define term Figure of merit
f
Draw characteristic curve of Additive white Gaussi an noise (AWGN)
g
Write down difference between DPCM and PCM
h
Find the Nyquist rate and Nyquist interval for sig nal: (i). X(t) = 8 sin(70πt) + 9cos(75 πt) (ii). X(t) = 30sin(100πt) cos(200 πt) (i) Discuss the reason why non -coherent demodulation is not possible for BPSK . (j) Write different types of digital modulation techni ques

Section BAttempt any three of the following: 10x3=30

a
Determine the Fourier transform of rectangular puls e and draw its magnitude spectrum
b
Illustrate Narrow Band Frequency Modulation with mathematical expression
c
Define threshold effect in angle modulation. Illustrate the relation between the transfer function of Pre-emphasis and De- emphasis for frequency modulation
d
State and prove the sampling theorem and explain how you will recover the original signal from its samples
e
Construct and explain the block diagram of Transmitter and receiver for a QAM

Section CAttempt any one part of the following: 10x1=10

a
Draw and explain the modulator and demodulator of DSB-SC
b
Derivethe mathematical expression for SSB-SC Modulation
a
Illustrate Wide Band Frequency Modulation with its spectrum and mathematical expression
b
Define phase modulation. Demonstrate the fundamenta l of the generation of FM with the help of PM and similarly the generation of PM with the help of
a
Derive the expression for probability of Error for binary phase shift keying
b
Write down the difference between Probability Density function and Cumulative Distribution Function with their properties
a
Define delta modulation. If a baseband analog messa ge is converted into PCM with a maximum message frequency 40 Hz. If this sig nal is sampled and encoded by 8-bit encoder, then obtained the bandwidth of PCM
b
Draw and explain the block diagram of transmitter, channel, and receiver of PCM system
a
Write down the difference between BPSK and QPSK. Explain QPSK generation and detection with its signal constellation diagram
b
Draw the block diagram of Transmitter and Receiver of BFSK. Explain its working

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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