Punjab Technical University 2006 M.C.A MODERN COMMUNICATION - Question Paper

MCA exam 2006 MODERN COMMUNICATION ques. paper


Elective - MODERN COMMUNICATION

Time: 3 hours Maximum: 100 marks

PART A ans ALL ques.. (8 x five = 40 marks)

1. (a) Why we need for modulation? discuss AM. Or
(b) Briefly discuss the single - sideband modulation and demodulation.

2. (a) Compare AM with FM. Or
(b) discuss directly modulated FM transmitters. discuss AGC and AFC

3. (a) discuss AGC and AFC Or
(b) discuss single tone and multi tone FM

4. (a) discuss in detail about PCM. Or
(b) discuss in detail about PAM sampling.

5. (a) discuss in detail Flat-topped PAM sampling. Or
(b) Compare the FSK with ASK.

6. (a) discuss in detail about microwave communication. Or
(b) define in detail about mobile dispatch system.

7. (a) explain about the Losses in Fibers Or
(b) discuss the p-n photo diode detectors

8. (a) discuss the basic principles of television Or
(b) explain about the generation of composite receivers.

PART B ans ALL ques.. (5 x 12 = 60 marks)

9. (a) Briefly discuss the balanced modulator circuit. Or
(b) Draw and discuss the block diagram of AM transmitters.

10. (a) Sketch the graphs and discuss equivalent frequency deviation and avg. noise power
output for noise in FM receiver. Or
(b) explain about the narrow band FM and wide band FM.

11. (a) discuss the pulse transmission system and encoding system. Or
(b) Briefly discuss the digital modulation techniques

12. (a) discuss in detail about Satellite Communication system Or
(b) describe orbit and Station keeping. discuss the detail about transmission path in Satellite
system.

13. (a) What is the advantage of using a graded index core in a fiber? discuss how energy is
lost from fiber at a sharp bend. Or
(b) Briefly discuss the block diagram of black and white television receiver.

Earning:   Approval pending.