Communication Engineering-I 2018 Question Paper — Government College…
The 2018 Communication Engineering-I previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: Communication Engineering-I
- Course: Communication Engineering
- Branch: COMPUTER ENGINEEERING
- Year: 2018
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all selecting at least two questions from each Section.
- Each question carries 20 marks.
- Assume necessary data if required.
Questions
Section - A
selecting at least two questions from each Section. Each question carries 20 marks.
- Q1. (a) What is the function of communication channel? Explain how modulation helps in reducing antenna size in wireless communication with the help of examples. (b) Give comparison between power spectral density and energy spectral density. [20 marks]
- Q2. (a) Explain in detail the classification of signals with the help of examples. (b) Explain the demodulation of FM by slope detector method. [20 marks]
- Q3. (a) For single tone AM, derive the expression for total transmitted power $P_t$ in terms of $P_c$ and m. (b) With the help of neat diagram explain the operation of switching modulator. [20 marks]
- Q4. (a) What is Pre-emphasis? Why it is used? Sketch the circuit of pre-emphasis. Explain why de-emphasis must also be used. (b) Briefly discuss Varactor diode modulator. [20 marks]
Section - B
selecting at least two questions from each Section. Each question carries 20 marks.
- Q5. (a) With the help of suitable waveform, explain clearly difference between ideal, natural and flat top sampling. (b) Give comparison between TDM and FDM. [20 marks]
- Q6. (a) Explain in detail with the help of block diagram the generation and reconstruction of PCM signal. (b) Briefly describe Aliasing. [20 marks]
- Q7. (a) Explain with block schematic the generation and detection of BFSK. (b) Show that the entropy to be maximum when all messages are equiprobable. [20 marks]
- Q8. Write short notes on any two: (a) Delta Modulation. (b) Generation of PAM. (c) Shannon - Fano coding. [20 marks]