Subject 2018 Question Paper — Government College of Engineering and T…
The 2018 Subject 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
- Course: Analog Communication
- Branch: ELECTRONICS & COMMUNICATION ENGINEERING
- 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.
Questions
Section -A
- QQ1. (a) Draw the block diagram of communication system and explain the function of each block. (15) (b) Explain the fundamental limitation of communication system. (5) [20 marks]
- QQ2. (a) Prove that balanced modulator produces output of sidebands only. (10) (b) An AM transmitter radiates 9KW power when carrier is unmodulated and 10.125 when sinusoidally modulated. Find the modulation index. If modulated with another sinewave to depth of 40 percent, calculate the transmitted power and effective modulation index. (10) [20 marks]
- QQ3. (a) With aid of neat diagrams explain working of Phase discriminator as FM demodulator (15) (b) Differentiate between narrow band and wide band FM (5) [20 marks]
- QQ4. (a) What are the advantages a superheterodyne receiver has over TRF. (5) (b) Define Intermediate frequency and image frequency. What is the relation between them (5) (c) Explain: Shot noise, transit noise, Signal to noise ratio, Noise figure (10) [20 marks]
Section -B
- QQ5. (a) State and prove sampling theorem (15) (b) What is aliasing and how can it be reduced. (5) [20 marks]
- QQ6. (a) With aid of neat diagram explain the generation of PWM signal. (10) (b) What is quantization and quantization error. How can this error be reduced. (10) [20 marks]
- QQ7. (a) What are the short comings of LDM and how can ADM overcome these problems. (15) (b) Explain TDM in brief. Can TDM be used for continuous signals (5) [20 marks]
- QQ8. (a) What is ISI. Explain the factors responsible for Intersymbol interference (10) (b) Give an analysis about Nyquist criteria for distortionless basband binary Transmission (10) [20 marks]