COMMUNICATION ENGINEERING utu previous year question papers

communication eng.
sem 4th
utu previous year question paper

Time: 3 hours

Total marks: 100

Note: Draw diagrams and waveform wherever needed.

Attempt any three:

1. What is amplitude modulation? Explain its generation.
2. Explain DSBSC with its generation.
3. What is super heterodyne receiver?
4. With the help block diagram explain working of automatic frequency control unit.

Attempt any four:

1. Derive expression for  frequency modulation and draw its modulated waveform.
2. Describe the relationhip between FM and PM.
3. What is the basic principle of PM generation?
4. Discuss various internal noises present in communication systems?
5. Derive noise for resistors connected in series.
6. Derive the expression for noise temperature using Friss formula.

Attempt any four:

1. Differentiate between natural sampling and flat top sampling technique.
2. What is PAM and explain its generation.
3. Explain demodulation of PWM with proper block diagram and waveform.
4. What is PSK? Explain with proper waveform.
5. What is delta modulation? Write the advantages of adaptive delta modulation over delta modulation.
6. Compare the waveforms of FSK and PSK. Also explain FSK generation using 2 ASK inputs.

 Attempt any two:

1. Differentiate between GEO, MEO and LEO systems. Also write the Kepler's law for planetary motion.
2. Briefly explain:
   (i) Satellite Transponders
   (ii) Skip distance
   (iii) Fading
   (iv) Critical angle
   (v) PCS
3. Explain sky wave propagation. Also further explain line of sight (space wave) propagation in detail.

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