Download AKTU B-Tech 7th Sem 2018-2019 NEC 702A Analog And Digital Communication Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 7th Semester (Seventh Semester) 2018-2019 NEC 702A Analog And Digital Communication Question Paper

Printed Pages: 02 Subject Code: NEC702A
Paper Id: 190056 Roll No:
Time:
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B.TECI-I
(SEM VII) THEORY EXAMINATION 2018-19
ANALOG AND DIGITAL COMMUNICATION
3 Hours Total Marks: 100
1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
Attempt all questions in brief. 2 1110 = 20
Draw the Basic block diagram of analog communication system.
Explain the advantage of SSB-SC over DSB-SC.
Explain transmission bandwidth of FM signals.
De?ne angle modulation.
Describe quantization noise.
What are Wavefomi coding Techniques?
Compare digital modulation and pulse modulation. , / .
Explain coherent and non-coherent methods. ?w.
State and explain the Hartley Shaman law. f" "r
Explain bit interleaving.
SECTION B
Attempt any three of the rouomg "3113? 3= 30
Describe the elements of commcation system and describe its l1muations features,
applications and advantag?k?
De?ne and explain 35%|???) noise ratio Describe methods to cal?ulate Noise in AM
and FM systems. 6
Explain and differenflate between PAM & PCM systems vCompare their advantages
over other
Compare and describe the digital modulation techniques of ASK FSK and PSK
Describe the Basics of Information Theory Explain how information is measured
Describe Entropy, channel capacity & Infori'nziiim rate.
SECTJON C
Attempt any one part of the following 10 x l - 10
Explain the functioning of aswer hetrodyne receiver Describe IF ampli?ers and its
applications
Describe Frequency Dms10n multiplexing Explain Amplitude modulation and
describe its detection process.
Attempt any one part of the following: 10 x l = 10
Explain Nanow band and wideband frequency modulation. Explain the working of 21
Frequency Division Multiplexed System (FDM).
Explain the Generation and detection of frequency modulation Noise. Explain
different type of internal and external noises.

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Attempt any one part of the following: 10 x l = 10
Explain the functioning of modulation and demodulation. Describe Quardrature
Amplitude Modulation (QAM).
Draw and explain the block diagram of Differential Pulse code Modulation with
transmitter and receiver.
Attempt any one part of the following: 10 x 1= 10
Explain with the help of block diagram, the working of Delta modulation. Explain
How Adaptive Delta modulator ihiproves the performance of Delta modulator.
Explain the need of digital modulation. Describe the types of digital modulation.
Draw and explain the waveforms for amplitude, frequency and phase shift keying
methods.
Attempt anv one part of the following: 10 x l = 10
Describe the fundamental concepts of Time DlVlSlO?yMl?llplcxmg Explain the
functioning of TI carrier system
Determine the Huffman code for the followmgsnIessage with their probabilities giv en a. .,
Also calculate the entropy, redundancy and'ef?ciency of the codes generated.
X : x1 x2 x3?- -33 x6 x7
P: 0.04 0.25 100.03: 0.1 0,3 0.2
wt ?3
t. w? .
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