Download AKTU B-Tech 6th Sem 2014-2015 ADC Eec 609 Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2014-2015 ADC Eec 609 Question Paper

Printed Pages _: 4
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PAPER ID : 1211531
Roll No.1 ~
B. Tech.
(SEM. VI) THEORY EXAMNATION, 2014-15
Time : 3 Hours] ' [Total Marks : 100
Note .: Answer 31] th? questions.-
1 Answer any four parfs :? 5X4=20
(a) ? Explain the Wodang of Phase inn: method for ssn.
(b)
(C)
(d)
(e)
?1216011
SC generwon with block diagram. Draw the spectmm
of 888-50
Den've an exprw?sion fo?r e'???ctive t?bdulation index of
a multi tom modulated AM.
The equatic?ih 15f an AM: 'wave is
x (t) =100 {14: 2003 (628m)]?00'8'62 a?oat) ??nd all the
freque?cy main '
De?nevestxgm?lmdebam modula??m Dmibetheworldng
of frequency dhcmnma?cnmethod ?o?r VSB generation
and cala?ateih? ba?t'iWidth 6m modl?a?on.
Describe brie?y the operation of super heterodytie
receiver mpmpec block diagram. What is drawback
of timed radio ??qumcy receiver? ?
'1 [Contd...

(80
121601]
Answer any four parts :- 5X,4=20
2
(a) A single tone FM is represented by the voltage eqtiation
as v(t) = 25ccs[ 951107 t + Ssin1650 t]. Find the
following:
(i) Cartier frequency.
('11) Modulating Frequency
(iii) Modulatibn index
(iv) Maadnmm deviation
(b) What is the difference between direct and indirect
methods 'of FM generation? Explain the working of
varactor diode method for FM generation.
(a) De?ne signal to noise ratio and noise ?gure of a receiver.
Derive a relation between noise ?gure and equivalent
noise temperature. '
(d) TWO resistors 20 k ohm and 50 k ohm are at room
temperature. Calculate the thermal noise voltage, for
bandwidth of 100 kHz. ?
(1) For two resistors in series.E
(11) For two resistors 'in parallel.
(e) Write comparis?oii?betw'ec?n AM. ?and FM. and derive
the equation for F.M.wave.
3 Answer any two parts : 10X2=20
In what way a pulse code modulation in di?eren?t from
other modulation system. What makes it a digital
system? What are the advantages and application of
PCM?
2 [ Contd...
(b)
(0)
(d)
4
(a)
1 (b)
(6)
121601]
Answer any two parts :
Describe delta madulation systems. What are its
limitations? How can they be overcome? Compare it
v with di??erential PCM.
Write short n?tes on-
(i) Granularity & slope-overload error in delta
modl?a?on
(ii) Non uniform quantization and its applications.
A Television signal having a bandwidth of 4.2 MHz is
transmitted using binary PCM system. Given that the
number of quantization levels is 512. Determine:
(i) Code ward length.
(?11) Tranmission Bandwidth
(in) Final bit rate ?
(iv) Output SIN ratio.
10X2=20
Explain the working of the coherent ASK receiver and
obtain the expression for probability of error,
Draw the block diagram of Transmitter and Receiver
of BPSK. Explain its working-and also calculate
probability of error.
Why FSK is preferred over ASK? Give reason, How
FSK is generated and obtain the expression for its
bandwidth. Brie?y discuss regarding its frequency
spectrum
[ Contd...

5 Answer any two parts : lOXZ=20
(a)
(1))
Symbol
Probability
(C)
121601]
Design binary Huffman code for a discrete source of
?ve independent symbols A, B, C, D and E with-
probabilities 0.4, 0.2, 0.3, 0.08 and 0.02 respectively
such that the variance of code word length is minimum. .
Consider a sequence of symbols generated by a source
with their probabilities of occurrence as given below
$1 82 S3 S4 SS S6 S7 SS S9
0.22 0.19 0.15 0.12 0.08 0.06 0.067 0.07 0.05
Determine the code words of the s?yn'lbols using
Shannon- Fano coding'techi?qUe. Also determine the
average code word length. '
De?ne information and entropy. Find an expression'for
the channel capacity of a continuous channel.
4 [6375]