Question Paper: Communication System Question Paper - December 2015 - Instrumentation Engineering (Semester 4) - Mumbai University (MU)
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## Communication System - December 2015

### MU Instrumentation 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

### Attempt any four questions:-

1 (a) Explain in brief:
i) Signal to noise ratio
ii) Noise figure
5 marks

1 (b) Discuss general telemetry system. 5 marks

1 (c) With neat block diagram explain the operation of Basic communication system. 5 marks

1 (d) Compare TDM and FDM. 5 marks

1 (e) Derive Friis formula. 5 marks

2 (a) Define AM and explain High Level Collector Modulator along wiht circuit diagram and waveform. 5 marks

2 (b) The antenna current of an AM broadcast transmitter modulated to a depth 40% by an audio sine wave is 11A. It increases to 12A as a result of simultaneous modulation by another audio sine wave. What is modulation index due to second wave. 5 marks

3 (a) Explain any one method of F.M. generation. 5 marks

3 (b) In FM broadcasting, What should be the maximum frequency deviation? Who has laid down this constraint? How bandwidth requirement of FM wave are calculate? Explain Carson's rule. 5 marks

4 (a) What is pulse amplitude modulation? Explain modulation and demodulation process. 5 marks

4 (b) Explain, why it is essential to use radio frequency (RF) telemetry. Describe it with some relevant example. 5 marks

### Explain briefly:

5 (a) (i) Amplitude shift keying (ASK). 5 marks

5 (a) (ii) Frequency shift keying (FSK). 5 marks

5 (b) Explain with a neat block diagram Delta modulation transmitter and receiver system. 5 marks

### Write short notes on any four:

6 (a) PCM transmitter system. 5 marks

6 (b) OSI reference model. 5 marks

6 (c) Modes of communication. 5 marks

6 (d) Practical diode detector. 5 marks

6 (e) Superheterodyne receiver. 5 marks

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