raper/Subject Code: 40905/ Principles of Communication Engineering

S.E Scm V Chci ce Baed Eletumscs NUVD2019.

(3 Hours) Total Marks:80

N. B.: 1)
Question No. 1 is compulsory.
2) Attempt any three questions out of the
remaining five questions.
3) Assume suitable data wherever
necessary

Answer the 20
following (any four
a) Explain granular noise and slope overload error in delta modulation.
b) Explain image frequency and double spotting in AM receivers.
c) Compare wideband and narrowband FM.
d) Determine the second, third and fith harmonics for a 2kHz repetitive wave. Also find out t
total harmonic distortion if the fundamental frequency amplitude is 10Vms, a S

harmonic amplitude is 0.2 Vms S, and a third harmonic amplitude is 0.1 Vmb
A Certain transmitter radiates 9k W with the carrier unmodulated, and 10.125kW when the
)
carrier Is Sinusoidally modulated. Calculate the modulation index. If another sine wave,

the total power

corresponding to 40% modulation, is transmitted simultaneously, determine
radiated.

With the help of a neat bock diagram explain the third method for SSB generation.
a) find the upper
sideband
For AM v(t)=500(1+0.4sin(3140t)sin(6.28x10't) volt
signal
b) an
the frequency
modulation index. Draw
frequency, lower sideband frequency, bandwidth, and

spectrum for the AM wave.

receiver. State its
merits 10

a neat block diagram explain the working of superheterodyne

c)With
and demerits.
10
and de-emphasis.
in FM. Hence explain pre-emphasis and vector 10
a) Explain noise triangle giving proper
block diagram
method of FM generation
b) Explain the Armstrong
diagram. 10
with waveforms. 10
and PPM generation
Explain PAM, PWM neat block diagram.
a) division multiplexing with a
b) Explain frequency
PCM.
for companding in 5
state the laws
companding and diode detectors
a) Explain and diagonal clipping in 10
clipping block diagram.
Explain negative
peak Modulation giving proper
b) Variable Slope Delta
Continuously 10
) Explain
error?
What is aliasing 5
and flat top
sampling. is 4V and
w a v e . If
the carrier voltage
natural sampling sine the
and PM. If
Explain 40OHz audio
a) is m o d u l a t e d by a
modulation
index for FM
carrier
A 25MHz find the for FM and index
b) deviation is 10kHz,
calculate the new
modulation
maximum
the 2kHz,
is changed to
frequency if 5
modulating
RF amplifier
and an IF of 450kHz,
an 20MHz.
having kHz and i)
PM rejection
of a
receiver
frequency of
i)1200
the image at an incoming
c)Calculate
coils are 65,
relevant both frequencies.
the Qs of the rejection at
frequency
Comment on
the image
**
*******

7592
 Subject Cho
Paper |/ Subi
Code:
aned)
291s I201 40905/Principles Communi
TR
eation
of
Fng
ol9
eering

NB:attempt
1.Question number 1
is
(3hours)
questions compulsory
2.
any 3 Total Marks:80
3. Assume suitable data from the remaining five
wherever questionsneeded
Q. Answer any 4
questions:
With a neat circuit
a)
What are its merits diagram and waveforms, explain the (20)
and working of envelope
demerits?
hExplain double spotting. How it detector
c) Define the can be overcome in AM
following terms with receivers?
Selectivity, Sensitivity, respect to Radio Receivers
d) A single tone FM signal is Fidelity, AGC
given by eru ()=20 Cos (16
Find the modulation
index,
r 10f 1+ 25 Sin 2m 10
modufating frequency, deviatíon, carrier.
power in the FM signal. fréquency.an
e) What is Coherent
detection? Explain the method of Coherent detection of
signal. SSB-SC

0.2 a) An AM signal is próduced by modulating a cariersignalwitipeakvoltage of 10V and ()

frequency of 100KHzby:.a sinusoidal signal ofamplitude4V and frequency

4 kHz. Determine:
a) thémodulation index änd Write its mathematicaléxpression
b) Bandwidth ofAM and sketch
' ,
itstwosided _pectrum
across load resistance,
o)Total power ofthemodulated wave developed carrier.
and
RL=50Nand powercontent in each sideband
the third method
of SSB (8)
employed forgeneration of
SSB? Explain
bWhatarethe methods
adyantagesanddisadyantages.
generátion.withits can generate a DSB- (6
based / BJT based)
modulator.circait(diode
cProye that Balanced
SCsigríal t
with NBFM (
WBFM signal
Compare
generation.
Armstrong.method ofFM
Explain the t. find (8)
Q3a) ,

modulates a
carrier A Cos a

angle
signal 15 Cos(2n
15x10°t)

modulating
sígnal for FM
system.
modulating
FM, if
bandwidth
b)A
fmodulation
indexand the modulation
index for

the BW and
in the KHz2V.

Determine thechange Assume

Kf= 15
to half.
() reduced to
5 KHz
amplitude
is
reduced

Signalfreqis ,if
index
m o d u l a t i o n

and
bandwidth
(i)find
Page
1 of2

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 SE Sem iv
Cc8SGS) ETRX Nov - Oe

Fundamentals of Communicalion 93 0.P. Code26508

Q.P. Code c26 .
1312l2o1a ITime: 3 Hours]
1
tMárks:80
Please check whether you have got the right
N.B:1) Question is compulsory and Solve any three
qyestionpapg
2) Assume suitable data if necessary.
rom tig romainihg tivgqufe
3) Figures to the right indicate full marks.

Q.1 Answer any four questions from the

following:
a)
b)
Explain the advantages and disadvantages of TRFTOtel"
What is multiplexing? TDM with
Compare FDM
FD9EOES
Discuss the need for modulation in
What is AGC? Why is AGC needed in
wireless.fomntiiDcatiorn
d) super heterodyge
e) Compare AM and FM.

Q.2 a) With a neat circuit diagram and wávef 04

What are its merits and
demerits
explan ne
b) A sinusoidal carrier has
amplitidof 0y and frequene 06
modulated by a sinusoidal yoltagogf amplitnde 3v ndegiency RTZModlated voltage is
developed across a 50.Nre_istanee Wte theegustionoTmodilateg waye
and draw he modulategsyaeindating max Vanid )Diternine nodiation Index.
And calculate total power the modulated wave i P wthespeerum of modulated
wave.
c) Explain anyone týpg b diàgráms 10

Q.3 a) With the helFfaieasut dagt w StFoster Seeley discriminator. What is 10

its disadvantage?S
b) With ageat blogk dia elta modulation, its advantages and 10
disadyajtages
Q.4 a) Wth gh block of Super heterodyne AM receiver. 10
kngtechniques. What is aliasing eror? How is it 10

Q Scceivers: Selectivity, Sensitivity, Fidelity and Double 10

poting
Discuss
199
799BITT8
afionof PWM signal. For a sinusoidal modulating signal, draw 10

otes
FMdggeneration using Atmstrong method d) Skywave Propagation
ISB Traisthis51 oaK e) Noise triangle
FABA
omghasis circuits with wayeforms
367F
ABAP
L) Vre urnha sis e

83579 BlTT. Page 1 of 1

 21 6
SES VETRY C84S
undamauml 4 C nurah on b 3

QP Code : 548203

TotalMarks 80
3 Hours)
N.B.(1) Question No. 1 is compulsory.
(2) Solve any four questions out of remaining six.
(3) Assume suitable data if required
(4) Figures to the right indicate full marks
the following
20
Answer any four questions from
modulated wave to a
(a) Calculate the percentage power saving in AM
are
one of the sidebands
depth of 100 percent, when the carrier and
Suppressed.
(b) Describe briefly the forms of various noises.
(c)Explain natural and flat top sampling compare the
two.

(d) Explain companding and its need in communication. wave

(e) What is ionosphere? How does it help in Electromagnetic
propagation.
Receiver. 10
2. (a) With the help of Block diagram explain superheterodyne sin
sin 3140 t) 10
(6) The output voltage of a transmitter is given by 500 (1-0.4
resistance Determine
6.28 t. This voltage is fed to a load of 600 2
(ii) Modulating frequency
i) Carrier frequency
Mean Power output
(ii) Carrier power (iv)
(v) Peak Power output

limitations? How can be 100

Describe delta modulation system. What
are its
3. (a)
they overcome?
block 10
with the help of a neat
(6) Explain Armstrong method of FM generation
diagram and phasor diagram.
communication. 10
Explain the following terms as applied to wireless
4. (a)
i) Signal to -noise ratio
(i) noise figure circuit diagram 10
the operation of the balanced slope
detector using a
(b) Explain
waveformns. 10
of PAM, PPM and PWM with
5. (a) Explain generation of radio receiver. 10
(b) State and explain important parameters
20
6. Write short notes on any three :-
(b)
(b) FM noise triangle
(a) AGC
Pre-emphasis and De-emphasis
FDM and TDM (d)
(c)
 S..Sem V ETRX CBGS Nay DeeLO IG.
Hundameudals Cmmumicah on ba
QP Code: 548203

(3 Hours)
N.B.: (l) Total Marks : 80
Question 1 is
(2) Solve any No.
four compulsory.
(3) Assume suitablequestions out of remaining six.
(4) Figures to the data if required.
right indicate full marks.
1. Answer any four
a) Calculate the questions from the following
20
aepth of l00 percentage power saving in AM modulated wave a
percent, when the carrier and one of the to
suppressed. sidebands are
(b) Describe
briefly the forms of various
C) Explain natural
and flat noises.
(d)Explain companding andtopits sampling
need in
compare the two.
(e)What ionosphere? How does communication.
is
it help in
propagation. Electromagnetic wave
2.
(a)With the help of Block diagram
explain
of a transmitter is superheterodyne Receiver.
(6) The output 10
6.28 t. This
voltage given by 500 (1+0.4 sin 3140 t) sin 10
voltage is fed to a load of 600 2 resistance Determine
Carrier frequency )
(ii) Carrier power Modulating frequency
(iv) Mean Power output
(v) Peak Power output

3.
(a)Describe delta modulation system. What are its limitations? How can be
10
they overcome?
(b) Explain Armstrong method of FM generation with the
help of a neat block 10
diagram and phasor diagram.

4. (a) Explain the following terms as applied to wireless communication.

10
Signal to -noise ratio
noise figure
(b) Explain the operation of the balanced slope detector using a circuit diagram 10

5. (a) Explain generation of PAM, PPM and PWM with waveforms. 10

(b) State and explain important parameters of radio receiver. 10

6. Write short notes on any three:- 20

(a) AGC (b) FM noise triangle
FDM and TDM (d) Pre-emphasis and De-emphasis
(c)
 SE (
Flechonms) Sem (old (v-2 o09)
/6/7
TIS14/ T0952
S.E(ELECTRONICS TNGGi(SEM IV) BASC OF ANALOG AND DGLALCOMMUNICATION

Q.P. Code: 16625

[Time: Three Hours] [Marks:100
Please check whether you have
N.B: 1.
got the right question paper.
Question.No.1 is compulsory.
2. Solve any four of
3.
remaining
Assume suitable data if
necessary.

Q.1 a) Explain PAM system. 05

b} Compare AM with FM.
05
c) Compare Narrow band &wide band FM. 05
d) Explain Sampling Theorem. 05

Q.2 a) What is need of Modulation? 10

b) Explain elements of communication 10
System.
Q.3 a) Explain ISB system. 10
b) Explain Frequency spectrum of FM. 10

Q.4 a) Explain superhetrodyne Radio receiver. 10

b) Explain Direct FM generation Method any one. 10

Q.5 a) Explain Pre-emphasis & De-emphasis in FM. 10

b) Explain PCM system. 10

Q.6 a) Explain Adaptive Delta Modulator. 10

b) Explain PAM. 10

Q.7 Write short notes on any three 20

TDM
PPM
c)Modulation Index of AM
d) Noise traingle in FM

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 S.E.
Som. CBSGS EAorlacnt Ca Muon 1
ftundam eutala Cornmumi cahicn u i neoinq

Q.P. Code: 50770

(3 Hours) Total marks: 80

Note (i) Question I 1s compulsory and Solve
any three from the remaining five questions
(ii) Assume suitable data if necessary.
(ii)Figures to the right indicate full marks

Answer any four questions from the [201

Q.1.
Compare AM and FM.
following
a

b What is multiplexing? Compare TDM with FDM.

C Discuss the need for Pre emphasis and De emphasis circuits with waveforms.,
With a ncat circuit diagram and waveforms , cxplain the working.ofenvelope defecto: wna arc
its merits and demerits?
Explain the working of TRF Receiver with a neat blockiagram. Vhat are its merits and
demerits?

Explain the generation and detection of DSB-SC'with neat diagrams

[10
Q.2.a [04]
b. Bring out the salientfeatures of Vestigial Side Band system(ySB).
[06
C. amplitudeofóv and frequency20 KHzis amplitnde
A sinusoidal carrier has
modulated by asinusoidal voltageofamplitude3v and freqiedoy 2KHz. Modulated
and Write the
a 502 resistance. i) find
the módulation index
voltage developed across and d i) calculate total power and.sideband power
is
inthe
equation for modulated wáve modulated wáve and find its BW.
modulated wave iv) Draw the
two sided spectrum of
detector. Compare its [10
the working of Ratio
Q.3.a With the help of aneatcircuitdiagram, explain [10]
discriminatof. the output
features with thatof Foster Seclay Supér-heterodyrnereceiver with
waveforms at

diagramof
b. Draw the functionálblock of each block
block. Explainthe functions
of each Bring out its [10]
Linear Delta modulation,
diagram (discuss the workingof
Q.4.a With a neat. block
advantages and disadyantáges Draw the spectrum of sampled
signal for [l0]
signals.
theorem for lowpass How you
overcomeit?
State and Prove:Sampling
can
b. Aliasing.error?
2W,fs2W What is
fs 2W, fs [10]
and Double
Sensitivity, Fidelity
Radio receivers: Selectivity,
to
with reference [10]
Q5.a Explain the terms a sinusoidal
modulating signal,
spotting, AGC PPM signal. For
of
demodilation
generation and
Discuss the
o.
PWM pulses [20
draw PPM,and
demodulator of SSB-SC
on anyfour:generation d) Product
O:6 Write shortnotes wave e) Companding
method ofFM
a)Indirect receiver
Transmitter and
b) PCM
c)Noise triangle
4******************

E6OCFC45F2172FDFO2888C8F24115A94

FOWOwirng
maux a - 1 1 2
or i e
decomposition
vaiue
Singular
C) Find the
 S.E. ald h14
4 1 6) i 8
m T Chai a
ad. Aecmi
undplea Ormmun Cohen Egineum a
.P. Code : 50776

NB: 1. (3hours)
2.
Question number 1 is Total Marks:80

3. Assume any 3 questionscompulsory

attempt
suitable from the
data wherever remaining five
needed questions
Q.1 Attempt any 5 questions
a) Why do we modulate
b) A single
tone FM
a
signal for transmission? 20
CPM signal is given
(t)= 20 Cos (16 « 105t+25 by Explain.
find the
modulation Sin 2rt 10 t)
power in the FM index, modulating
Compare Amplitude signal frequency,deviation', arrier and

1) bandwidth, Modulation and Freqiency

ii) effect of noiseModulation
d) ii) signal quality, interms of
Draw a well labeled on the signal anct
e) Explain Shannon's diagram super-heterodyne receivet
of a Jran8
Compare TDM and FDM. Sampling theorem and explain aliasing erOT
r,
Q.2 a) An AM
signal is produced by
and requency of 10OKHz by modilatiog acarjer signal with peak voltagecoT
frequency of SKHz and max an information sigmal
a) Frequency amplitude 4V. Determine ith maxmoduianng
b) Bandwidth of
limits for.lower and upper sideband
CTotal power of the
AM
d) Drawthe modulated wave if the loadresistance,R 10 S2
power spectrum.
e) Calcolate the totat transmted cument.
b What are the
methods employed for generation of SSB?Explain the third method of
SSB generation (10)
with- its advaritages and disadvantages.
Q.3 a) Explain the indirect method of FM generation.
b) (8)
What is image frequency and its rejection? Also explain double spotting. (6)
c) n a Super heterodynè receiverhaving no RF ampifer, the loaded Qof the (6)
anteina coupling circuitis30,1fthe IFis455Khz, calculate the image frequency
and its rejection ratio-for tuning at 00RHZ{iN20 MHz.
Q.4a What is multiplexing in communication systém? Draw a block diagram of (6)
frequency divisionmulriplexingtòtransmit.5 SSB signals.
Draw andexplainthefransgnitter and receiver of Delta modulation. What is meant (10)
by slope overload distortion?
Bring out themerits and demeits of.adaptive Delta modulation 4)
Q5.aWith.the hefpofaneatblockdagram explain the generation and detection of a 8)
PPM signal, Al5o-eiplainthemerits and demerits of a PPM transmission.
' 6)Expläinthe terms iSelectivity, Fidelity, Sensitivity, AGC
c Explain companding
Write short notes:anyfour (20)
and receiver
a) Block diagram.of PCM Transmitter c)TRF receiver, its merits and demerits
TIdigital cariersystem e)Pre-emphasis and deemphasis circuits
Foster Seelay.discriminator method

************************

E6OCFC45F2172FDF02888C8F240566B6
SE Sem 1Y (C8SGs)tTRX may June
may 20/S
6)
Fundamentals of Communicaion 33
3534
/D6|20IS QP Code
(3 Hours) [ Total Marks: 80

N. B.: (1) Question No. 1 is compulsory.

(2) Attempt any three questions from the remaining five
questions.
(3) Assume suitable data if required.

1. Answer the following (any four) 20

(a) Classify and explain the various noises that affect commuinication.
(6) DSB-FC (AM) is a wastage of power and bandwidth. Justity.
()Derive the expression for frequency modulated wavs.
(d) What are pre-emphasis and de-emphasis.
(e) Explain companding and its need in communication.

2. (a) Explain basic block diagram of communication system in detail.

(b) Explain the following tersm 8
(i) Signal to noise ratio
(i) Noise factor
(ii) Noise figure
(iv) Equivalent noise temperaiture
(c) Write short note on vestigial sideband transmission. 6

3. (a) Explain with the help of eizcuit diagram and waveforms any one method 10
of FM-generation.
(6) Comment on bandwid1h of FM wave.
(c) An AM broadcast transmitter has a carrier power output of 100 kw. Find
the total power and sideband power with 75% modulation.

4 (a) The maximum deviation allowed in an FM broadcast system is 75KHz. 10

If the neoulating signal is a single tone sinusoidal signal of 20 KHz,
find the band width of FM signal using carson's rule. What will be the
change in band width if modulating signal frequeney is doubled?
Determine the bandwidth when modulating signal amplitude is doubled.
(b) Draw the block diagram of Adaptive delta modulation system and explain 10
its operation. What are the advantages of this over delta modulation/

S. (a) Explain frequency demodulation system using phase disoriminater. Draw 10

the circuit diagram and phasor diagram.
(b) Explain in detail generation and detection of PPM. 10
6. Write short notes on any four ofthe following 20
(a) Electromagnetic frequency spectrum
(b) Frequency division multiplexing
(c) Sampling theorem
(d) Automatic Gain Control.
(e) Image Frequency Rejection.
 sE dld h 214

SE Sem Iv
(cBSGs) ETRX Dec' 2oIS
FCE
142loS QP Code
5482

Total Marks : 80
(3 Hours)

N.B. : (1) Question No. 1 is compulsory.

(2) Solve any three questions from remaining five questions.
(3) Assume suitable data if necessary.

20
1. Give brief answers to any four
(a) What is delta modulation ?
and noise figure.
(b) Define the terms signal to noise ratio, noise temperature
(c) What is need of modulation ?
(d) State and explain sampling theorem.
(e) Write advantages of SSB modulation.
10
2. (a) Explain Ring modulator. the average. 10
index which is 0-75 on
(6) An Am broadcast station has modulation
if it could go over to single
What would be its average power saving, the
while having to maintain
sideband suppressed carrier transmissions,
same signal strength in
its reception area.

AM 10
rule and explain working of superhetrodyne
3. (a) Write note on c a r s o n

receiver. of block 10
frequency modulation system with the help
(b) Explain the Armstrong
diagram.
10
With respect to radio
receiver. Explain
4. (a) (iii) Image frequency
(i) Sensitivity
(iv) Double spotting
(ii) Selectivity 10
radio receiver.
(b) Explain superhetrodyne
10
PPM.
5. (a) Compare PAM, PWM and and comment on Adaptive 10
by quantisation noise
whet, is meant
(b) Explain
delta moduiation.
20
four:-
Write shert notes on any
6.
and de-emphasis
(a) Pre-emphasis
Division multiplexing
(b) Time modulation
(c) Pulse code
(d) Electromagentic spectrum
(e) AGC

-V

MD-Con. 11583-15.

TOITOWIng
maux a
n
aecompositionoTtIE
C)Find the Singuiarvaiue
 SEletdondS Scm V (oD pleth 2019

BHDCS

MV-18910
(OLD COURSE) QP Code :

100
(3 Hours) I Total Marks:

N.B. (1) Assume suitable data if any. ARS

ENGINE RING
(2) Question No. 1 is compulsory.
(3) Solve any four questions from remaining
D
20
1. (a) Explain elements of communication.
b)What is need of modulation ?
(c) Explain VSB system.
(d) Explain function of R.F. Amplifier in radio receiver stage
(e) Explain Sampling theoram.
OF 10
2. (a) Explain function of Balance modulator in A.M. 10
(b) Explain ISB system. LEGE
10
3. (a) Explain indirect F.M. generation technique.
(b) Draw any explain frequency spectrum, of F.M. Vsfem.
(c) Compare narrow band and wide band of F.MA

10
4. (a) What is need of Superhetrodyne Radio
:39
PM
Recèiver ?
10
(b) Explain ratio detector.
10
5. (a) Explain PCM system.
it ? 10
2014ayoid
(b) What is aliasing effect, how to
10
6. (a) Explain PWM system. 10
.(b) Explain Adaptive Delta mbdulator.

7: Write short notes on any three 20

(a) FDM
(b) Modulation
ikdex of AM
(c) Delta modlator
(d) Filter method for SSB generation.
NEERING
Dr.

Con. t425-14.
O L L E GO
E F
EN
 Nov 1

E TR Sem V old
BADCS
al
(OLD COURSE)
0.P. NO : 14427

(3Hours) Totai Marks: 100

B. : (1) Question 1 is
compulsory.
(2) Solve any four questions from
Q. 2 to Q.7.

(a) Explain elements of communication system.

20
b) Compare Analog signal & Digital signal.
(c) Explain function of IF Amplifier
(d) Explain Delta modulation.

(a) Explain different types ofnoise in communication systen. 10

(b) What is need of modulation. 10

10
(a) Explain partical diode detector ? 10
(b) Explain S.S.B. generation technique any one.
10
radio receiver.
(a) Explain superhetrodyne 10
(b) Explain Pre-emphasis De-emphasis.
&

10
Indirect FM generation technique.
5. (a) Explain 10
& Demodulation.
b) Explain F.M. Modulation
0
10
6. (a) Explain PAM system.
Delta modulation.
b) Expiain Adaptive
10

System. 10
7. (a) Explain PCM
FDM System.
b) Explain

LM-Con. 10538-14.