Question Paper: Fundamentals of Communication Engg Question Paper - May 2016 - Electronics Engineering (Semester 4) - Mumbai University (MU)
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## Fundamentals of Communication Engg - May 2016

### MU Electronics Engineering (Semester 4)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

### Answer the following (Any four)

1(a) Explain the concept of equivalent noise temperature. 5 marks

1(b) Explain the distortions in diode detector in AM receiver. 5 marks

1(c) Explain noise triangle concept in Fm. 5 marks

1(d) Explain the sampling theorem & aliasing error. 5 marks

1(e) Explain the need of Modulation in analog communication. 5 marks

2(a) Explain the direct and indirect method of generation of FM signal. 5 marks

2(b) Explain the different method of generation of SSB. 5 marks

3(a) In superheterodyne receiver having no RF amplifier the loaded Q of the antenna coupling circuit is 100. If the IF is 455kHz, calculate:
1) The image frequency and its rejection ratio for tunning at 100kHz.
2) The image frequency and its rejection ratio for tuning at 25MHz.
5 marks

3(b) Explain TRF receiver with block diagram also explain TRF sensitivity and TRF selectivity characteristics. 5 marks

4(a) Explain the process of quantization in PCM. Determine the signal to noise ratio at the output. 5 marks

4(b) 'In PCM, SNR can be controlled by transmission bandwidth' Justify. Compare PCM and Delta modulation. 5 marks

5(a) Explain the ratio detector with the help of circuit diagram and explain its merits. 5 marks

5(b) Explain PAM, PWM, PPM generation and detection. 5 marks

6(a) Compare digital signal and analog signal transmission. 5 marks

6(b) Derive Friis formulas for noise. 5 marks

6(c) Explain the slope overload and granular noise in Delta modulation. 5 marks

6(d) Explain FDM with neat block digram 5 marks