Communication Engineering (BEC401) - AKTU Question Paper 2023-24
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 2023-24. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
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Questions Asked in 2023-24
Communication Engineering (BEC401) — complete question paper · 70 marks · 3 Hours
- aState the need of modulati on in communication system
- bIf modulation percentage of an a mplitude modulated system is 1 00 %, then determine its efficiency
- cWhat is the effect of modulati ng signal’s amplitude on bandwidth of FM system?
- dDefine the term figure of merit
- eState two disadvantages of delta modulation
- fFind the Nyquist rate and N yquist interval for the signal x(t) = 20sin(100πt) cos(200πt)
- gState difference between convent ional phase shift keying and d ifferential phase shift keying
- aDraw the block diagram of a co mmunication system. The antenna current of an AM broadcast transmitter, modulated to a depth of 30 % by an audio sine wave is 10 A. It increases to 12 A as a result of sinusoidal modulation by another audio sine wave. What is the modulation index due to second wave?
- bWith the help of block diagram, explain the demodulation of FM wave using Phase Locked Loop (PLL)
- cDetermine the figure of merit for Double Side Band Suppressed Carrier (DSBSC) system
- dWith help of a neat block diagr am, discuss transmitter and receiver of PCM system
- eDiscuss Quadrature Amplitude Modulation (QAM) in detail
- aAn Audio frequenc y signal 40 Sin (6π × 500 t) is used to amplitude modulate a carrier of 200 Sin (6 π × 106 t). Calculate: (i)Amplitude of message signal (ii)Amplitude of each side band (iii)Total power delivered to the load of 5 KΩ (iv) Carrier Power (v) Transmission efficiency
- bWith help of neat diagram, illustrate the working of ring m odulator as DSB-SC Modulator
- aWhy Pre-emphasis and De-emphasis is done in frequency modul ation. Discuss in detail
- bWith help of neat block diagram, discuss how FM wave is gen erated using AM wave and its vice-versa
- aWith help of a block diagr am, discuss time division multiplexing
- bWith help of neat diagram, e xplain the working of delta modulator
- aState various types of noise s that are encountered in a communication system
- bProve that for a PCM signal, Signal to Quantization Noise R atio (SQNR) in dB is given as 1.8+6R, where R represents no. of bits per sample
- aWith help of wave forms, explain amplitude shift keying. Al so draw the block diagram of its modulator and demodulator
- bWrite a short note on Mi nimum Shift Keying (MSK)
Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.
Repeated Questions — BEC401
Questions that appeared in more than one session, found by comparing 3 years of Communication Engineering papers (2023-24, 2024-25, 2025-26)
State the need of modulati on in communication system
Appeared in: 2023-24 · 2024-25 · 2025-26
Draw the block diagram of a co mmunication system. The antenna current of an AM broadcast transmitter, modulated to a depth of 30 % by an audio sine wave is 10 A. It increases to 12 A as a result of sinusoidal modulation by another audio sine wave. What is the modulation index due to second wave?
Appeared in: 2023-24 · 2025-26
Determine the figure of merit for Double Side Band Suppressed Carrier (DSBSC) system
Appeared in: 2023-24 · 2025-26
State various types of noise s that are encountered in a communication system
Appeared in: 2023-24 · 2025-26
Communication Engineering — Other Year Papers
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