Friday, November 30, 2012


Anna University, Chennai Nov/Dec 2012 Examinations Important Questions
Common To III Sem IT
Unit I-V
1.     Derive an expression for the Amplitude modulated signal and draw its frequency  spectrum
2.     Derive an expression for the AM power calculation, current calculation & modulation by a complex information signal
3.     Compare FM & AM.
4.     Describe the frequency analysis of Angle modulated waves. Explain their Bandwidth requirements
5.     Draw FSK Transmitter and explain. Describe its Bandwidth Considerations
6.     Define FSK and give the symbols of BFSK and explain the modulation mechanism with relevant waveforms and expressions
7.      Explain the QPSK system with appropriate expressions and diagrams
8.     Compare the various types of digital modulation techniques
9.     Explain the modulation and demodulation process of PCM in detail Discuss on companding
10.With a block diagram, explain the adaptive Delta Modulation technique
11. Describe the operation of DPCM system with neat block diagram
12.Determine 12-bit linear code, 8-bit compressed code, the decoded 12- bit code, the c quantization error and compression error for a resolution of 0.01 voltage for analog  sample voltages of a) 0.083V b) -0.398Vc) +9.234V d) -20.124 V
13. Explain TDMA system with its frame structure, features, efficiency
14.Explain CDMA System with its features. Explain the various problems available in CDMA system. Compare TDMA & FDMA
15. Give a detail account of the different types of multiple access techniques
16.Explain the principle and operation of direct sequence spread spectrum system in detail with an appropriate example
17. Explain the principles and operation of LEO, MEO and GEO satellites
18.Describe in detail the operations of various types of optical detectors
19.Enumerate the elements of an optical fiber transmission link
20.           Draw the neat diagram of satellite system link model. Explain its each part in detail