MU Analog Communication - May 2013 Exam Question Paper

MU Electronics and Telecom Engineering (Semester 5)
Analog Communication
May 2013

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 Tracking in AM receiver

5 M

1 (b) What are the causes of fold over distortion? How can it overcome

5 M

1 (c) Explain how PPM is generated from PWM

5 M

1 (d) List the advantages of digital communication over analog communication system. Explain in brief

5 M

1 (e) Explain pre-emphasis and De-emphasis in brief with the help of circuit diagram.

5 M

2 (a) Why is frequency modulation preferred for stereophonic broadcasting? Explain in brief

5 M

2 (b) An AM broad casting operates at its maximum allowed total output of 100 kW at 90% modulation. How much of this power is the intelligence signal?

5 M

2 (c) Explain high power AM-DSBFC modulator with schematic diagram

10 M

3 (a) Explain measurements of Receiver Performance in detail

10 M

3 (b) What is noise? List the types of noise and explain each in brief

10 M

4 (a) Explain in detail pulse width modulation (PWM) with the help of circuit diagram

10 M

4 (b) Explain Delta modulation. Draw the output signal waveform? Also differentiate Delta modulation and Adaptive Delta Modulation

10 M

5 (a) The Signal to Noise ratio of an AM system is 25dB. The highest audio frequency transmitted is 30 KHz. If the trasnmitted carrier power is reduced by one-tenth and FM with a deviation of ± 15 KHz is employed, what signal to noise ratio is obtained

10 M

5 (b) Explain foster Seeley discriminator with the help of schematic diagram

10 M

6 (a) Explain VSB transmission

5 M

6 (b) What is superheterodyne dune tracking. Explain in brief

5 M

6 (c) The output voltage of a tranmitter is given by 500(1+0?4 sin 3140 t) sin6.28t. This voltage is fed to be load of 600 ? resistance . Then calculate -
(i) Carrier frequency
(ii) Modulation frequency
(iii) Carrier Power
(iv) Mean power output
(v) Peak power output

10 M

Write short notes (any four) :-

7 (a) FM noise triangle

5 M

7 (b) Ratio Detector

5 M

7 (c) Squetch Circuit

5 M

7 (d) Primam causes of ISI

5 M

7 (e) AVC and AGC

5 M

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