MU Analog Communication - May 2014 Exam Question Paper

MU Electronics and Telecom Engineering (Semester 5)
Analog Communication
May 2014

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 :

1 (a) What is Quantization? Explain types of quantization

5 M

1 (b) AM is the waste of power and bandwidth. Justify the statement

5 M

1 (c) Explain why FM is more immune to noise

5 M

1 (d) Explain double spotting in radio receivers

5 M

2 (a) State advantages of SSB over DSB. Explain any one method generate SSB

10 M

2 (b) Explain the following with reference o radio receivers :-
(i) Sensitivity (ii) Fidelity
(iii) Selectivity (iv) Dynamic Range

10 M

3 (a) Derive Mathematical expression for FM wave and its modulation index

10 M

3 (b) One input to a conventional AM modulator is 500 KHz carrier eith amplitude of 20 Vp. The second input is 10 KHz modulation signal that is of sufficeint amplitude to cause a change in output wave of ± 7.5 Vp. Determine :
(i) Upper and lower sideband frequencies.
(ii) Modulation co-efficient and percentage modulation
(iii) Expression of modulated wave
(iv) Draw output spectrum
(v) Sketch output envelope

10 M

4 (a) Explain indirect method of FM generation

10 M

4 (b) With the help of neat circuit diagram explain the generation and detection of Pulse Position Modulation (PPM) signal

10 M

5 (a) What are the drawbacks of delta modulation? How adaptive delta modulation solve these problem?

10 M

5 (b) State and prove sampling theorem for low pass signal

10 M

6 (a) Draw the following data waveform for the bit stream 11010010 :
(i) Unipolar NRZ
(ii) Bipolar RZ
(iii) Bipolar NRZ
(iv) Bipolar RZ-AMI
(v) Unipolar RZ

10 M

6 (b) Draw the block diagram of Pulse code modulation and explain each block

10 M

Answer the following (any four) :-

7 (a) Automatic Gain Control

5 M

7 (b) Pre-emphasis and De-emphasis

5 M

7 (c) Squetch Circuit

5 M

7 (d) Comparison of Narrowband and Wideband FM

5 M

7 (e) Adjacent channel and co-channel Interface

5 M

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