Electronics and Communication Engineering Question Papers

1. 565,,,. E c
Examination, Doc.r0 l4lJan.2015
Entreprenueu13hlp
ote: A,sNd I;l YE fulI qt.snots, sebting
at least TWO qtdtiohs frou.kh Dad
Cive m example loreach olthe naDaeenal fundions and explain rhe sane
ExDlainanynvep rciplesofnrdagenentastumulaledbylalol.
a. List ard explain the ecps inplmni.s.
b. Lisr ar] live trres olpi.ns lnd explain each bieny.
a. whalisspmolco.totandNharlatusafleclit?Explain.
b. bxplain Ecflihenl andelecli.n. What h MBO and MBEI
rlos does M61ow s hcnarcny ol needs help r ma.ager ro
b. Lkl Hygiencd and rorivarion factor as per He.zberg and explain $enimpkations.
1t0h*,
Eta.r=!
0. List the *ages.fentetBicurpmces and expdin my oie olihem
b. Lisl dEcharaconsics olan entepeneurand cxplaln any o.. olrhem
Lin lhe chomcreistiq olsnall scale indunry (SSl) d erplain th. need for SSI n the
economyofacou.rry. (lllrL,
Wiar ethesepsi.volvedin$aningSSl?Explainoneofthefl (l0Nkrk,
Ltt sotoe slale leel ageNies shidr supporl SSI and explanr one ofrhen as r. hos rlley
assistlhe ssh ol)Ni!*t
What are ihe scheines olnnance provided by SIDBI? Eaplain one olrhe schemes. O0 NLrrt,
a. M del Gasibility nudy
b. Finxnclxl leNb,l,q $udy
c. Technicrl feasihiliry sludy.
d. Economi. lcasibiinys$dy.
l0AL5l
Fifth Semester B.E. Degree
Managemenl &
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ea
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motivaE his subordinales?
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2. fifth Sem.stcr B.E. Degree Examination, Dec.20r,r/Jan.2015
Analos Gommunications
Note, Anstra at! ! Il/E full 4tenio,s, selec.ite
a .ast IWO qu.stiors liort ea.h ?aa
i Define: i)rlilbenx"nslom: ii)IE.enre1ope. (r3 ]L ,
b Wilh aneal diagmm. cxplain ho* SSB lydve is genemrdd usins ohase discinnnator tuerhod
irlr only USB and rcjcding ihc LSB (03rr s)
finJ thc tlilbed hnslonn oar signal x(r)= cos2nlLrsin 2n !r *heictnnessagcsigrl
sd ll is sad.rsigal. O,r !r!!kt
PARI - A
a. ShorthalllleareamderPDlcu^disalwayscqualtounny los!,rkn
b EplaiD crossco elalion lirncrions. cl!c rhc prcFdies orcro$corel,tion lnncrion.
(07rr*,
c A three dieil Dresaae is lr Nmincd over a noisy chan.el haling a prcbability ol enor
P(E)=: pernisn. Find otrr lhe co(espondins CDI
Expldin ihe geneDtioD of ,{M wale trsing squaic las nlodularor along trirh iclevanr
dir8nhs and analysis {07!r*,
vith . nea{ blo.k dirgnm eplrin rhe brlanced morlulator melhod olsenemling DSB-SC
Consider a Dressxgc siqal rn(t) = 20 cos (2I, lolts dd a carier signal is
i) Sketd to scalercsuhingAM wae lbr 7s% modularion
ii) hird lhe rowerdelivered x.ros a load oll00Odue ro rhis A'I $are
r0EC53
E
1
i:
i:
.':
ZE
z1
:
4
a Explain silh ftlelmr equalions lhe io*ing ol etrvelope dete io. ol USB
b. Wnh aneat block diagram, explai. the lyo&hg ofFD4lechnique
c 'rite dre block diagLan olsuperhclcody.c ic.eirerann speciii the
in dc roc.r!er. Lisl rhe advanrascs olsucn receive6.
5
PARI B
Dedrc the equaiion for Fy *avc. 0clinc inodularion indcx. tramlm dclidi.n and band
*idrhola IM sig.al 16 trrarkt
Erplain t'M genemtion uslng drccl melhod. (07M3ir,
Ar rM ware is denned by (tl = l0 cos (2 +si.(6r1)) r_ind rhe instsniloeous liequencyol'
s(i) (os ),h*,

3. t"I
l-^ola' d e,o'l.rro d b. m.eo.loDe de's oru,ed o' F4 detrooll o'
Explain FM demodulation usins zeo cF$ing det*tors.
vnh a neat block didCito, erplain the workinc or FM nered multiplexing and
([rxrk,
l0Ec53
a. whalisnoiseequilaletrlbandwidrh?Donveancxpe$ionrorlhesorne (0rvr*n
b. Dcnvefriksfomulaforaftplifiesconncctcdincascadc. (,n Mi 9
c. An amplilier sith lodB nose ligure and 4dB poNcr grin is cascadcd. Wilh . sccofd
asplifierhas a lodB poiver sain md 10dB noise fisuE. What n lhe ovemll noise nsuE and
Po$ergaii? (04 Y! n
a. Dedve dF equarion lor ouqur si8lal to none Edo lor a DSB-SC syslem
b E xplar the woiking o I pre-emphasis and de-en ph asi s in FM.
c. shorv lhat de sisnal to none Edo or the oulput lor a single bne rM
"heRtheinbol! have -!,i noLrtr,

4. r0tics2
-l
Fifth Semcsler B.f. Degree faminrtion. Dec.20l4'J.n.2015
Digltal Slgnal Processing
ote. Aas@l FIVE Jnll q r.stions, lde.tiaq
d least TwO querrions fro"t ea.h w ,
z
:.
,.
p?
ia
i:
a='-t
a
Srlrc and prove the Elarionship betseen zrranslbm and DFT.
D(r mnneNotr Drror ^,nr-.o-/-(''. o.* l.
]
riind the IDFT ot x(K) = 1255, 48.a1 - jt66.05. -st-j102.
-73 6l j.1605_ 5l-Jlol.its.6:l l66jl.
Statc and prove the followiDgfroperllesl
Pro c: i) Synmety aDd iil Pcriodlcny ptupny ol a Niddl. hcior,
Find the ourput t1n) olr ilrer whose nnFuhe esFone n h(n) = { l, 2,
sanalto rhc firiq n (i) = il,l. 1. 1.3.0,5-6.2. 2, 5. 6,7. 1.1,0.
add neih.d iuse 6 ponn crcular convolutionl
5
r. D qminc y(n)= x:(n)@ x:lD). girei xr(n)=n+ 1,0 < n <5 rdi(n)=
Lsing Slo.kh,lnis incd,od.
b Delelop DIT f ljT rlgorithn and witc sigDaliloN graph ibrN:3.
c. ExIlanr inplace cofptrtarion ofIlT.
a Erphh bitcvesalpropefly used tu IFT algorirhm lbrN = 16.
b Declop DIT-FFT alsorthmtbr =9.
c. Ind IDFT olx(K) = 116. -4-19.7. -4+j4, -1-i1.7, -1. -4 j1.7. -4 j4,
DIF fIT algonrhn, Show cleaily all rhe inrmiediare renrls.
!4Bf:.8
a Desigi a Chebysiev tilter ro meer tne lbllowi4 speciticrtiens:
i) Pa$ bard ripple < I db
ii) Srop band axe.uarion : 20 db
iii) Pass baidedgc: L iadrs.c
n, Stop band cdge r I i md^ec
b. DiriDguish benveen IIR and FIR filters.
c De ,e ar exprsion forotderoaa low pa$ BuneNordr nlte.
, Rc.lizc FlRlnrcdpnasc Iihcr for to beeren
b. EvalLLalc tlrc impulrc rcsfoDsc rbr inpur x(n) = a(n) of three st.Bc lBnrce
coeticienh K =0.6i. K. =-0.3,1a.d Ki = 0.8. AlsodraLv,isdnedfonn-

5. l0Ec52
how a. analog fiher is frapped on to a disital nls using inpulse
!1rar are the limnarions olthe 6erhod?
d]rccl fom I dd bttice structr for the slsteh desfibed by the
For the desned ftequency response
G_& r+<.<l+
' [0. +'-'tr
f8d H(o) for N = 7 using Hanni.g window.
Show that for P = 0, Kaiser windoq becomes a edtugular window.
Mendon few adunhges md disadva ages ofrindowing technique.
equarion y(n)=x(n)+:x(n - 1*1*,n - z,*1"rn - rr.

6. a_l.
?i. .,
l0Ec5l
Fifth Semester B.E. D€gree Examin.tion, Dec.201.lruaD.20l5
Analog Communications
Note. A"s|'er anr t-It/Efa qtetrions, selali,g
atleN TYO qrcnio,s fron zactl pan-
PARI' A
Shosrh8rthcffcauiderPDF.unenalsaseoualIouniiv.
ExplaiD crosscoftehrion tuncrions cive the prcpenies ol.ioss corelation tunclion.
(0ihrk,
A three dieit nessage is transnnted orr a noisy chmnel haling a pbbrbllily of eror
P(E)=: pdJ,sir. rind o lne..respondingcDF
i.1he
'tccircr
Lirl rhe rdvatrrrqe( oln'ch ft.eive(
PART- B
Deive fie equarion for FM $ave. Deine nodularion index. naximum deriation lnd baDd
width olaFM signal (o3Drlr)
Lxplah FM geneLation usine dftctne&od. 107rrrln
An FM *ave is denned by nt) = l0 cos (2 + sin(6n0).Inrd de insun'meous ncqtrcncyol
s(t) (051hit,
,
2
i*
:.
"
=
x. Extlain the geneFlion of AM trave usine squarc-las nrodulaior along Rith rleant
drxgmnsxnJ rnalysis (0, Nhrk,
b. Wirh a neat bloc* dilgmn. cxplain rbc balxnced modulalor serhod olgencmti.g DSB-SC
(0?Nr,rk,
c considcr a mesage sigal m(1) : 20 cos 12tr0 volls md a .m1er signal h .t) = 50 cos
i (l- t-, f,.,e{tri1g,AM....-._5,".0odrh on
n) Find rlrc poqerdeliveEd acos a lood oll00!) due lo drn ANl yave. (06 rL{n
a. Dciiner i) Hilben transfomr iil PE.enelope. OBMlrkt
b with ancar diasDm. expiain how SSts uve is senemEd using plase disc ri.atorDrelhod
sirhonlyusB anddcdingfielsB. (03Nhr[,
c. Find the Hilber.lra$lom olasisnal x(t)= coslrit sh 2r lr wlEre fi is ne$aee sigal
ann ar hcamersienal (olNkrk9
. Explain $ilh Eleanl equalloN the rvorking ol envelope delection of USB sar plus
(06 Nlrkt
b wilh ane blockdiagmm. erplain rhc so*ingoiFDM E.hniqu., (07Nlirlg
c write lhe block diagram olslper heGodyne receiverand speciry lhe inlponxnce oril valre

7. a. Explain lhe workingofa balec.d slope dere.io.used lorFM d.nodularion.
b. Explain IM denodulation using zerc crcsins derectos.
l0EC53
c. with a neat block diagam, explain the rorking of
a. whal is noise equivalml bandsidlh? Denve an expE$ion lbrrhe same. (03 NIre,
b. Derive ldiss fomula for mpliiets comectd in cascade, @sMerkt
c, An anplner Nirh lodB nose figuE and 4dB powd eain is cascaded witn a second
amplifierlda lodB powergnin dd 10dB noise fiCuE. Wiat is thc olcrall noise nguE and
power gain? 101 M"rk,
FM srereo multiplexing and
(03 M!rk,
a. Derlre rhe equation for ourpul signal lo noise Elio for a DSB SC slsto.
b. Explain the vorkingorpe<mphasislnd d.imphasis in FM.
c. Show rhal lbe siglal ro noise rario of the ortpur aor a sinsle to.e FM
s!R- -
iL
'drl "hercfie.mbolsha.edra $'ar.D..)
4 NoW
) ol2

8. 10EC54
!z
i.
:;
ir
a
a. srare the propc..ies olS-paraDeter. Pmve rhe synmctry propefiy and unnar!
b Expknr S-matix rcprese nu ron o I mu ltiport netwo rk
c. Definc the tbll.wins losses in nicrow.le netwo& interms oasparamctcr
i) lrsnion los ii) Transmissi..loss
5 a. Exphinwit[ a Dert rkcroh a piecnion ttlc variable atrenuator.
b. Evlain magic ree and de €the S{afixnnd mention irs applicarion.
c. wrire abrielnoteon phasc shilier.
a Explainthe con$ru.lnrnrn(l lield pattem lormicro strip lnrc.
b. Wlral arc thc losscs in nicrosrip linesl Expbnr Bdiarion loses.
c Co'naarestrip Iinc and nicrcstrip linc.
I of2
Fifth Semester B.E. Degr€e Examination, Dec.20l4lJan.20l5
Microwaves ahd Radar
Nor.. Ahstue, ah! FIVEfdl qlestiohs, sele.tire
atleast TwO qu^ttunsfron ea.h pa,t.
Mention lhe four modes oloperarion loi Cum diode. Explain brieny rhe Gunn oscillation
modc (roYsrrd
Dras,the equilalert circuit for parahetic amplitier and dlflai. ,n briefthe par,indtic up
(05 n!*,
ExplaintheprincipleofoperationolrcaddiodcnithsuitablediaEran. (0s Isrkt
Define rencction coeilcieft. Derive the equario. hr eflecrion coefllcient at the Ioad end
and at ddntance d Eom load end (roNtr.kt
A tansmnsion hre has rhe lollorving primary consranc per tT ol the li.e R = IJo.
G = 0.lno,l = r 5dH, C=9.F. Calculatc zo,d.0,u,andy atw= 5000Ed^ec (05Mrrk,
A tEnsmhsion lin. aal characrerisric impedance ol50 +10.01O and is tenninared iD a load
impcdance ol73 j42 5(). Calcularc: i) the rcreorion meliic€nl; i, sunding saleJatid
Derivc ele.aic and maenctic ficld equation in rcctansular wave gddes brTE modes.
O:M,rk,
writc abrielnoteor dominant modc and dcgenerate mode (0,lrr.rkt
Anair-tilledrcctangukNaleauideofinsidednrensions7xI 5cnoperatesinthedomin.nt
TE ,node. Find cutoli tequency. phase vclocity, guided wavelength olthe wave in the
r:uide ata nequencyofl.s CHz. (0rnrork,

9. Ddiv. an cxpE$ion for sinple
A 8rcund bssed ndor op.rals
prcdu.es l00kw, The @eiver
fom ofthe 6d.r mse equrion.
t0Ecs4
o. Write a briefnoteon mrimm unmbiguous Enge.
ol lcE The radd tr0nsmirlfuing dantenna olsain 50'i3
minimm derccrable sisnal h Sn" = lOrrv. Tbe myhum
iadar ra.ge is gilen as 259ko Find the 6oss section ofthe taiget lhe edd can detet.
8 ," wnh a nat diasmm, .xprain in advantas. ofl
'nd Q channels in disitalMTr Doppler
alj€nal proe"$!.
b. E+Fb lte Dridiple and workrngofMllrrdd wnb lhe helporblock diagram rl0Mr[t
c Frplsltr sDsl. d.l,y lir. cotr*lld wib Eor block dagam Denv6 tu erpre$rl tor
i.qu@cy rsponse ofsingle DLc.
./.:,
v^
-?i
. '
^o"
, t"'
$n
..5e
.o$'
r"

10. 10f,c55
1
E
i=
2a
-a
,=
a?
:t
e;
.,=
za
''
(rl l{)
b AblackandwlneTvfi.Lxrdr*,ni liil6 !Lr.s orpicturc ini.nnation. Assude that.ach
ltu consi$ ofi26 prcNe elernenrs (.r1eh) and rhar erch c0n hovc 255 brightness lereh.
l'icturc N Epemed rt rlrc *ic oall) n r.rs r s.o. Calculare llre avslge nte olirlom ion
For rhe !ren inst ord.r
_! .l
l2
ll.rkov $uice in Fis Ql
lil LDiroD olte nnr.e
lnformalion Tltleory and Codins
f;ot.t .lnswo- FIVL Jnl queltions, selc.linE
Lae TwO qu.slio"s fro", .ach part.
(a) shown find i) stac prcbabilties
n) rindG,.C.. (1oNr.kn
00 ilerlt
(0a M,rrs)
rd channcl capacity P(x ) = 0.6,
P(X )=:
ft
JI-,,L]
Lr
conret'cd bt:n T' s3L ur isu
c. D.fin. ( Sell.rftitr ],:.D ) Ent..ay
(iri) Raic olnnnDdion in
'
VtrturlinlbmrtioD
'l
l
,
Il I(X. )
'lil
.i+)=
IJ() H( )
2

11. $l:t t0EC55
na:tuxl intirinlti.n N nonExplali rheDrorreriids.lonriual ir11r.
For an AG'N cl'annil .!iri, .i irr r'
sisnalDowerFquned at lhc icolc
)!
l
Erphnr ShaDnonHaril.r laq.rchlN. .rDdcrr! rtoniFrooi
FiM the Druluxl inaornrarioD rDd nr. r r. nr! .ann.ty ol lhe chrnnel nrown in
P(Xj)=06 P(r:)=0.1
Civcnthcsoucc: S= S.S..S..S,.:, St.S lrr.L'
P= l'J r.0:1.0 r. rl i.0.1.0 0:.
ii) Find ! conrprct Hufinrin bMy cor; b] plic:ig conr|.slt. slnn as
iii) Fnrd. conpact Hnlliuan hDir.01. brplaursromp0s le slnirolas
ir) Find the av.mge f.igrI el1,.i.r], {!f,rm.,...,irxt!.d,xsrxnl
Fig. Ql (b)
t0t
0l I
LI
(r0rlrrkt
encoder md deroder rsed for .y.lic
(r0Nlirr)
-r-<--
v,. -;
frr Q.: (1,
AGr,.J'.!n,. l. 0!41 lLl e ctu ,.cl !6f ., I ) xrd
]
mxnnun irfofln,rbn ranr. 05irrrk,
!.lJrL:q
;.d.)q( rJ,.. 6. 1 1,r.. .t h! r i. ,
i) Find allaoisible.od.cdors.
ii) Iind dre mnrinium {eigx ofnr.,roir.
in) Fiid the padtychelk mauix
i!) For a recened clde veukn lt . r r 1)l 0
deied and ...€d emr rlrt hxs (n r .ln. i. mn.
b. Defin.th.icmr il BuNcftor i SJi n'rir lr r6oll,r.de
ni) Glknsneld rr) HtrDnln-g ellhr
what aE di$crcnt methods of Nrtuilr rs cfto6, [tlnD
Wbat n binary cyclic codcl Dcscrjbc Ltc lcurur: ol
codes using an (n-K) bil shit rerlst.
r.f]
a. For ihe f7,41si.rle rtu..d.t.rfr rJ.l,c codr rrrJ = rl, + dr]! + Ux: +drxr.nd
X" + I = X" + l. + (l - X I h,,l .X+I: x1 ril)g gcnemror poly.onrial
g(X) = (l + X + X') l_iDd aU 16..0,l. rc.tor .1 rtcri. codc borh in non sy$emaric and

12. l,/ t--/ )z
/.;/ c€dI".. q
,:[ .",*"&EJls
, l'/
i. Derem i1 nepJdrnlr<Fu'.1aI RS.,dco c-CFL?(o)rord,,,-11 6;- {d$1r,,r.,)
b. Con'ide-brl'. !(!rr..odeae'ed-. Jl -x'-r x: ' I rh,odi1dbr".sor
conectnrgabihtb=l.l:indlhebuderror.onecti.gclliciencyofdriscode. 05M.rkr)
ii) Rs cooei , ro !,.gl,r
a. What tre convolflior coCes? Hov/ is i J]ffl.cot Eodblock codes? @6Mrk)
b. For rhe convolution cncolcr, gr
'= I I l. e'' = 1l]l
I D'J{ rleercoocr bl{ ,.aE.d'r.
Ir l'roe.Fnr,'
'rr,,iii) Find $de word coLfipUidi.g lo r r iirnnation sequcncc l00l l Eing rnnc domin and
translnnn domin. OoMirkl)
c, wrne a noie on licllh dhgan. (04Mrk)

13. l0tic56LS
fifth Semester B.E. Degree Examinntion, Dec.2014/Jar,2015
Fundamenlals of CMOlt vl-ltl
otc. A$*et.,! FI/E.fu quesno"s, seledina
dletst TWOquestit ,s fioD .ach ,an.
.
1.-
=:
=a
:a
ta
zi
a
exprcssion y=,{B+cD. lrotrkt
b. wnh .e, diaerrm, exphin i, bxs.d dcsign rules aor rcd (nMos and cIoS) and
knsnbr desiln rules (nN1OS P4OSandC4OS) 110la*,
PART B
s a Discussthe architecnral issues El.ted ro $b slstemdeslgD (03 rltrrkn
b. Eplainslitch logic(DMOS and CMoS) implemenrarioi nrr4 *aynultipleer. (rrNk.ks)
PART A
Explain the nVoS dnhan.enent mode ta.snior operation for dificrent v.lues of
Vj and V+. (toMrrln
hplain rhc CMOS iirlerter tnnst characreristics hi-qhlightnrs tne Feions ofopeati.ns.r
e N]OS tr Nisror. (roiurrk,
Drx rhe.ncu andstrckdissnm lbr the nNIOS andCIOS imp lementation o f the Boolcan
Lplaii ibe differerccs bcsccn CNlOS comple$entart logi. and BlcMoS
Explainthe tullo{fg: i)D$nriclogici ii) Clocked C'IOS logic.
Prornle scaLin! facb6 lorl
iii) Porcrdnsipario uit arx.
n, MlxnNmoperariDgneqtre..y.
Discuss nrc follo$hg i. lcahg or4os.tr.uit:
i) Limisofminiaruraization.
tl Limns.f ift.rc.nre.tNd.ontrrr.siian.e
. Dn.us nre scncElauangerne$ ola 4'bir arnhtucric proce$or
b l-rpbin 4 x l barcl shiner{nh.eat dia5afr
a. Ertlain Stansnbrdynrmr RAN,I cell
b. lrtLdi. Ine operarion. read.perarlon for four lransisro. dyn,tuic
. !phnrdr scan design leclxriques. '
b lme r note on tcftbihy and rcaing