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FUNDAMENTALS OF COMMUNICATION SYSTEMS — Major (End Semester) 2026 question paper

MMMUT Electronics and Communication Engineering previous year question paper for FUNDAMENTALS OF COMMUNICATION SYSTEMS (BEC 152), semester 2, Major (End Semester) 2026. All 26 questions are listed below, each with a written answer on Nexsus.

Paper details

  • Subject: FUNDAMENTALS OF COMMUNICATION SYSTEMS (BEC 152)
  • Branch: Electronics and Communication Engineering
  • Semester: 2
  • Exam: Major (End Semester) 2026
  • Questions: 26

Questions asked in FUNDAMENTALS OF COMMUNICATION SYSTEMS Major (End Semester) 2026

  1. Q1(a). Draw the block diagram of a communication system and explain the function of each block. [2 marks]
  2. Q1(b). An FM radio link has a frequency deviation of 30 kHz. The modulating frequency is 3 kHz. Calculate the bandwidth needed for the link. What will be the bandwidth if the deviation is reduced to 15 kHz? [2 marks]
  3. Q1(c). What are the different types of signals? Differentiate between periodic and aperiodic signal. [2 marks]
  4. Q1(d). What is Nyquist rate? Discuss aliasing effect. [2 marks]
  5. Q1(e). What is Time division multiplexing? Differentiate between Synchronous and asynchronous TDM. [2 marks]
  6. Q2(a). Discuss DSB-SC-AM with diagram & drive the mathematical expression for bandwidth and power for the wave. [5 marks]
  7. Q2(b). When the percentage modulation is 75, an AM transmitter produces 10kW. How much of this is carrier power?. What would be the percentage saving in power if the carrier & one of the sidebands were suppressed before transmission took place? [5 marks]
  8. Q2(c). Explain the VSB-SC with its frequency spectrum. Mention Some of its advantages, disadvantages & applications. [5 marks]
  9. Q3(a). An angle modulated signal has the form v(t) = 100cos[2πfc t + 4sin 2000πt] where fc = 5MHz [5 marks]
  10. Q3(a)(i). Determine the average transmitted power
  11. Q3(a)(ii). Determine the peak phase deviation
  12. Q3(a)(iii). Determine the peak frequency deviation
  13. Q3(a)(iv). Is this FM or a PM signal? Explain
  14. Q3(b). Discuss the indirect methods for generation a wide-band FM signal. [5 marks]
  15. Q3(c). Discuss phase modulation (PM) signal with suitable diagram. Drive the equation for phase and frequency deviation for PM signal. [5 marks]
  16. Q4(a). State Sampling theorem with suitable figure. Further Determine the Nyquist sampling rate and the Nyquist sampling interval for the following signals. i. sin(2000πt) ii. sin(4000πt) + sin(6000πt) [5 marks]
  17. Q4(b). Discuss pulse width modulation (PWM) with diagram. Compare PAM, PWM and PPM pulse modulation techniques. [5 marks]
  18. Q4(c). Explain pulse code modulation (PCM) with suitable block diagram. Also elaborate each component of PCM systems. [5 marks]
  19. Q5(a). What are the different types of noise in signal? Define (i) Signal to noise ratio (ii) Figure of Merits [5 marks]
  20. Q5(b). Discuss the evolution of mobile communication from 1G to 5G. [5 marks]
  21. Q5(c). Discuss the following: i. CDMA ii. GSM iii. LAN [5 marks]
  22. QQ.1. Attempt any Five parts of the following.
  23. QQ.2. Attempt any Two parts of the following.
  24. QQ.3. Attempt any Two parts of the following.
  25. QQ.4. Attempt any Two parts of the following.
  26. QQ.5. Attempt any Two parts of the following: