Communication Engineering (KEC401) - AKTU Question Paper 2021-22
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 2021-22. 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:2021-22
University:AKTU / UPTU
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Questions Asked in 2021-22
Communication Engineering (KEC401) — extracted question text
Section AAttempt all q u e s t i o n s i n b r i e f . 2*10 = 20
- aDefine the bandwidth of a system and compare the bandwidth of DSB- C, DSB-SC and SSB-SC
- bIllustrate transmission eff iciency of DSB-C, DSB-SC, and SSB-SC. 1
- cDefine Phase modulation a nd draw its output waveform. 2
- dIllustrate the concept of Car son’s rule for BW calculation. 2
- eDefine Noise Factor for a system. 3
- fInterpret the noise perform ance of an amplitude modulated w ave in terms of noise figure
- gElaborate the term TDM with example. 4
- hFind Nyquist rate & Interval f or signal: x(t) = 4sin(30πt) +3cos(70πt). 4 (i) Discuss the reason why non-c oherent demodulation is not possible for BPSK. (j) Explain and draw the signa l space diagram for FSK. 5
Section BAttempt any three o f t h e f o l l o w i n g : 10*3 = 30
- aIllustrate the idea of havi ng modulation index for an AM si gnal equal to 1, greater than 1, and less than 1
- bDemonstrate Frequency Modulat ion technique with its expression and output
- cExplain the properties of Probability Density function and Cumulative Distribution Function
- dExplain the following in refe rence to the delta modulation (DM)
- aGranular Noise and b. Slope overload Provide the quantization noise for the DM with a step size Δ (Delta)
- eIllustrate the Modulator and Demodulator for Amplitude Shif t Keying. 5
Section CAttempt any one p a r t o f t h e f o l l o w i n g : 10*1 = 10
- aDraw and explain the modulat or and demodulator of DSB-SC. 1
- bFind out the Continuous time Fourier transform of rectangul ar pulse. Also draw the magnitude spectrum of the output
- aDemonstrate Phase Modulati on with mathematical expression a nd its output
- bDerive and explain Narrow Ba nd Frequency Modulation with FM generator
- aIllustrate the Noise factor for coherent demodulation of a DSB-SC signaling
- bIllustrate the relation betw een the transfer function of Pr e-emphasis and De-emphasis for frequency modulation
- aEvaluate the sampling theorem for a low pass analog message signal with an explanation of the mathematical expression for the sampling process
- bDraw and explain the block diag ram of transmitter, channel and receiver of PCM system
- aIllustrate the concept of QPSK with its modulator and demod ulator. Also draw the signal space diagram for the QPSK
- bIllustrate the concept of MSK with its modulator and demodu lator. Also draw the signal space diagram for the MSK
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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