Communication Engineering-I 2022 Question Paper — Government College…
The 2022 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 - 1
- Branch: ELECTRONICS & COMMUNICATION ENGINEERING
- Year: 2022
- 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.
Questions
Section -A
- Q1. I) A town has a population of 8000. Out of these, 4800 are males and 3200 females. Also, 400 males and 500 females are unemployed. A person is chosen at random. What is the probability that he is male and unemployed? (10 marks) ii) Find mean and variance for the Probability Density function of a random variable which is given by $F_x(x) = \frac{1}{2} e^{-|x|}; -\infty < x < \infty$. (10 marks) [20 marks]
- Q2. i) An urn contains two white, three red and five black balls. If three balls are drawn in succession. Find the probability that they will be of different colors. (08marks) ii) State and prove Tchebvcheff's theorem in detail. (12 marks) [20 marks]
- Q3. i) What is matched filter? Find its probability of error. (15 marks) ii) What is noise figure? Give its importance. (05 marks) [20 marks]
- Q4. i) Explain the following terms: (4x3=12 marks) a) White noise b) Noise bandwidth c) Resistor noise d) S/N ratio ii) Discuss different types of sources of noise. (08 marks) [20 marks]
Section B
- Q5. i) In the FM system, Modulating frequency is 400 Hz and voltage is 4.8 V, the modulation index is 80. Calculate the maximum deviation. If the frequency is reduced to 300 Hz, and voltage raised to 5.6v, what is the modulation index. (10 marks) ii) Explain the generation of AM SSB (10 marks) [20 marks]
- Q6. i) Explain the functioning of superhetrodyne receiver with the help of block diagram. (15 marks) ii) What is Pre-emphasis and De-emphasis? (05 marks) [20 marks]
- Q7. i) State and prove the Nyquist theorem for Sampling the signal. (10 marks) ii) What is quantization error and find its relation with step size. (10 marks) [20 marks]
- Q8. Write short notes on: (10x2=20 marks) i) Pulse code modulation ii) Adaptive Delta modulation [20 marks]