IT 09 404-PRINCIPLES OF COMMUNICATION ENGINEERING APRIL 2013 (2009 Scheme)

SUBJECT - PRINCIPLES OF COMMUNICATION ENGINEERING

CODE -  09 404

SEMESTER - FOURTH

BRANCH - IT

UNIVERSITY - CALICUT

YEAR - 2013

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Part A

1. Define Modulation.

2. A carrier wave of 2.5 kW is amplitude modulated by a message signal of 1 kHz to a depth of 50%.What is the total power of the amplitude modulated wave?

3. The following signals are passed as an Input to the Product modulator :

   v1=vm CosWmt

   V2=Vc CosWct

   What is the output of the product modulator?

4. What is a quantization error ?

5. What is heterodyning?

(5x2=10 marks)

Part B

6. Give the frequency bands of electromagnetic spectrum and its applications.

7. What is the need for modulation?

8. Briefly explain the operation of a collector modulation.

9. What is a Ratio detector ? Explain.

10. What is diversity reception ? Name the various types of diversity reception techniques.

11. Compare low level and high level modulation systems.

(4x5=20 marks)

Part C

12. Derive an expression for the AM wave and its power relations.

Or

13. Derive an expression for the FM wave. Prove that it has Infinite number of sidebands using Bessel Functions.

14. Explain the operation of a Square Law Modulator.

Or

15. Explain the generation of :

(a) PWM wave.

(b) PAM wave.

16. Explain the operation of a Foster-Seeley Discriminator.

Or

17. Explain the demodulation of :

    (a) PAM Wave.

    (b) PWM wave.

18. With block diagram, explain the Am transmitter.

Or

19. Explain the operation of a super heterodyne receiver.

(4x10 = 40 marks)

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