w w w . e x a m r a c e . c o m l. E .S . I OBJ) - 1 1101 o r I J ELECT RONI CS TELECOMMUNJCATION ENGINEERING L 2. 3 . 4 . 5 . PAPER-II p· s complemcut of 2BFD),., is a. E 304 b . 0 4tl3 c . D 402 d . 4{\3 The n umber of d i gi t l present in the bi nary • repre senta ti on r 3 x 5 12 + x 6 4 5 ~ 8 3 is a 8 b . 9 c , Ill <l 1 2 Wbfcl1 of the f oiiO\dng co ndit ional I F s t atements o f Pa scal are corred L lF co n ditio n 1 'THEN s t at ernenl 1 ELSE fF condition 2 THEN s t alement 2 ELSE state m ent 3 2 . JF cond i tion l 'THEN I F condition 2 fH.E N sta t eme n l ELSE sta temenl 2 3 . IF con dit io n I THEN I F cond il ion 2 TH EN s t a t eme nt] ELSE sta tement 2 Selecl the cor r ect r u 1 ~ w e r us i n g the codes given b elow · a . I and 2 b 2and3 c . I and3 <l 1 2ruJd3 In an assemb l er. w h ic h o n e of the followiug 1 s re q tured for l ' artab l e names in symbol t able'/ b . Values c . Registers <l Storage Whk h o f th e follo11lng operations nre pe r fom t ed o n l inear que u es ' I Test i n g a linear q u e u e fo r underfo ow E n que u e operation . 3 _ Dequeu e operation. ~ Testing a U near queue for ol'e r flow . Selecl the co rrect answe r us i ng the codes given belo\1 : a l . 2a nd 3 b 2 . 3 and 4 , 7 R ) _ c. l. 3 and 4 d . 1 , 2.3 nn d4 Efleclive a ddr ess is calculated b ~ adding o r s ubtra ct i ng displacement • · al u e to a. imme dint e address b . relative d d r e s ~ c . abso l ut e a ddr ess d . base address The m i cro programs pr o,;ded by a manuf acturer t o be used on h is m icro progr ammed computer are ge n eraUy called a. so f tware b . n et\\ are c. fi rm ware d . h ardwa r e The con t rol l ogic fo r a bmal) ' muhiplter ts spec i led by a state d iagra m The s tat e d i agram has f our sta t es and ti>O inputs . To i mpl ement il by the seq roe n c e r egisler arid decoder method a . IWO nip - flops and 2 4 decoders are needed b fo u r lip-Oops : md 2 • 4- decoders are n eeded c . t ~ V o f l p l l o p s and 3 > 9 decoders are needed d . fo u r nip-flop s and 3 ' ' decoders a r e n eeded The ou t p ut ro lt age o f a 5 - bit D / A binary ' ladder tha t h as a digi Ul l input O f 110 I U (Ass um ing o = 0 V ru t d 1 ; .. I ll V) is a . 3.4375 V b . i 0 v c. 8.125 v d \)J\875 v The 5 4 174164 c h ip is an 8·bit seria l - i nput · paralle l- o utput s bifi register. TI1e clock is l M H z . 11te time nee d ed ro shift an ~ b i t binary nu mb e r i nl o the c hi p i s a. II'S b . 2 flS c . ~ S d . 1 6 5
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a Plmse lead o m p e n . ~ a t i o nb. Pltase lag comJlensation
c. Gain compensati.l.,llBoth phase lag compensali<;m and gaineompensation
A constant N-circle having centre at (-112+ jO) in Li te G"plane, represents tlte phaseangle e q u ~ toa. 180°
b. 90•
c. 45"
d. o•The constant M-cl.fde represenred by the
equatiCin x' +2.25x+/ = - 1.125 wlterex
= Re [G(jro)) and y =1m [G{jro)] has the
valueofM equal toa. 1
b. 2
c. 3
d. 4
A Utird-o.-der system is npproximated to anequivalent second order systL>tn. The risetime of' trus approximated lower ordersystem \ \ ~ I I be
a. same as miginal system for ru1y input·
b. ;waller illan the origmal system f<.\r
any•inputlarger 1hllll the origir lal systenl for any'input
d. larger or smaller dep<.'lldillg on theinptH
industrial control sys1erns, which one ofthe following methods is m ~ t commonlyused in designutg a system for ItJeetittgperforrn,mt:e. sped fic'llrion9?
a. The transfer function is fust
det<Ymined and then citltcr a lead
compensation or lag. compensation isirnplemente<l
b. The b·ansfer function i a first
deter•Itined and PID controllers areimplemented by rnatltematicallydetermining PID constants
~ PlD contrcllers are implemented\Vithout He knowledge of tlte systemp•mmeters using Ziegler Nicholsmefltod
33 .
34.
3.5 .
4 of lJ
d. PID controllers are implemented usingZiegler N i c h o l ~ melltod after
d e t e n n i r r i r ~ g tlte system transferfwtctinl t
To permit the selection of 1 out of 16equiprobable events, dte number of bill!I'equired is
a. 2b. log1u I()
c. 8
d. 4
\VIticit one of tl10 fo llowingWPtlS ofnoisegains imvortllJlce alltiglt fre.Juency'/
a. Shot noise
b. Random o ~ ~ ec. Impulse noise
d. Transrt·limenoise
. (SIN!
0Tho ratio )'""" for l00 roamplitude(S I N AM
mo ilulHilon identical tol\Illnmsm lttedpower (mr ts ntodolation index of'!'X) is
9 ,a. -ur
2 I
3b. - rrl
l I
9 'd. - 1ft2 I
36. A c1u:der of frequency 1 MBz is amptillHemodulated by a signal of ti:equency of 1
kHz to a d ~ t h of 60%. Tilis is passedthrough a filter of dtaractoristics shown ill1he given Figore I and Figure IL I f t}te.6Uer outp11i is C'ed !Q an envelope detectqr,
l11edetectorOllJ!Illwill be
~ t r r _ l ~ * -_, .....· - ... ....
,.. ., ~ · -a zero
'b.
-·c. da - J kHz signal
d. J kHz signal
37 lftlte radiated power of AM tranlllllitter is10 kW, the power in tlte carrier formodulatiQn 1ndex of0.6 is nearly
.lf!. In n low- 10\·el ,\1'-'1 e m t·he ampl<fierwhich follows the modul;ated sta11e mus tbc tlte
:t. linear dcvio.:-
h. hannonic dwicc
c. ciJISs-C amp i.!ier
d. non·line-a.r device
39. Au nalgle-moduliltcd signal is s s c i by
= U m 75s in 2 Hl'1m
1l1c pe>k ft'<:qucJacy deviation of U1ocaorier is u,,.,a. 1 l i l lz
h. 7.5 kHz
c. 75 kHz
d. UKI 111Hz
For 10-bit PCM the KtvHII Il lquantiz.1tion r>li< is 62 dB If daenumber of l•iL< ill ; ~ . < C i i hy 2, then th"$ign•1 to quantW. tioo noise ratio " ill
a. jnccCll.'Oby 6 dB
b. inc:rcosc by 12 dB
c. decrease by 6 dB
d. dceoc osc by 12 dB
4L Wh<.1t the chtttmel is noi.y. producing aconditional probobility of error p ().5;
cl1annel y and enu·opy fun c1on
w o u l d ~ respcclivoly,
u. 1 and I
b. lond 0.5
c. 0.5 and L
tL ;and I
-12 For a given data rotc. tlao band11 cltlo P,. <>I'
• BPSK sign•l•ud tho band\\ idth j}, of Ole0 01\: signal related dS
43.
a, P, " flo, 2b. /1, = 2(J.
c,. P, = f/814
d. P, =flo r4In a '1 2 cl1anoel TOM' system. it is
found thot cbannd No. 3 and cbnnncl No.8 nrc connected tn lh c- same input signal.
l'his technique
11, was tes the channel capacity
5 " ' 13b. tokes c.tre ofdifferent sampling rote$
c. •• required when different bnndwidlhsi·gnals are to be
d. reduce• noise
44. MC'VF telegraphy S ~ : Sa. SSR tecluoiqne•
h. PuiJie modul:nion
C. llllt·O]:pand l l i nd. f!M
45. t\ radic) station w o at 800 kHz ond usesAJ\IL f t h i is a public bt•oadcost s \•>tom. itshould tnlnsmit us ing ·
"· pru·obol.ic reflector In tron!im.it oll roun(l
b. wmstilo ontormo for the rcquin:d band
c, holf-wnve long horizontal wire
d. • veo1ico l on.tenn• l""s than <1uartcr forprnctieol reros<ms
40. Equalizing pulses in TV are sent durin!'
a. horizantal blanking
h. vertical blanking
c. •ern tlons (slots)
d. tho horizonI• In:lrace
·17. Which one of lhe fo llowing relations i•correct for luminance sig11ol wi th Red (R).Gl'\...:n (G) OJl(l Blue (D ) eomponcnls?
o. Y 0.59 R • 0.30 G • 0. 11 B
b. Y 0. l l R ' 0.30 G ; 0.59 B
c. Y 0.19 R • 0.11 G • 0.60 B
d. Y 0.30 R • 0.59 G • 0.11 B-18. FUu: fulse •lama p>:oballilitl• (PI,) in a rudnt
found to be tl.05 undd cond ition• lik-e
large prf ·and put•e integraunn. Then t.he
dc"'Ction prol,.bitiLy
:a. is p c n d e n t of (lo<
b. is equ al lo ( I - ../0.05 )
c. is equnlto ( I 0.05)
d. d"J)end• <m ahe 1•ower received in echo
49. Wh ich of lhe following oS•an: thehyP..,fhi1lie syslcm(s) uflhc ! ! ~ U r ol . VOR
at 12.5 em and 37.5 t'm. Th<' operatinglrequonc.y is
a. 1.5 GlLzb. 600 M ~c. 300 M Hd. I ~ G
60 . The propagarion of TE ,. mode in arectangular waveguide is used to excite acircular waveguide. as shown in figure land figure II. Th e mode excited in theCLICUlar waveguide of figure l and figure nwll l. respectively. be
6 1.
6,2 ,
'
.....;; ........... ~a. TEtt and TMm
b. TMo1 d ~ ~ ~c. 'fEot nndTMot
d. TMt11 and TE01
,_.- --·
Pigu re I shows an open circuited
transmission l ine, 1l1e switch 1s dosed attime 1 0 and aile; a time t. the vo ltagedistribtJtion un the line reaches thilt shownin tigute 11. If cIs the velociry in line .
then
z,
a-=-0 '1. = Ifl....., I
a. I <1/cb. I = l hc.. 21/c>J>IIt:
d. 1<21/o:
E-
2
•= 0
Agur'ecU
> • I
For producing. circu larly pulnrized beamsin microwave co mmun ication fie ld. the
l) pe of antenna ideally suited is
a. helical antenna
6) .
64.
6S .
7 of IJb. parnbo lio dise with aperture
c:. pyr.lmillnl hC>m With sym metrical bea msha pes in F. and II plane
d. circular Loop antenna
Given figure shows a 900 sector ofspherical rc llec.ior with venc ' V. c.enLrc. ofcurvatu re ·c- ancl equal distanct'S VI), I)F,
FE alld EC'. When a beam ofc.lectromagueLic wave is incident parallel
to the a.xis, all lhe energy will pl\Ss throughHe region
D
,•', '.
,, .
a. VD
.b. DFc. FF.
d. EC
A cyllndncal cav icy resonator has diame ter
of 24 mm and length 20 mm. The
dominant mode and the lowest frequ encyband are opernted as
a. ' fE,, !md X-band
b. TM , 11 and ccband
c. TM o11 and Ku·band
d. 'TM,•o and X -baud
The equ ivalent circuit of a gap in tbe snipco nductor Of Bmicro Strip is
In pammetric umplificr USl'd ill m i c r o w a v ~co rnmunicalion $ ) ' ~ t e r n s . the gain is maiul)
t r i . ; t ~ d by
a. ambient h:mp.lratureb. pump frequct•c.v
c. pump t m n d \ ~ i d t hd pump energy
Which or the fo llowing stuwmcnt:s oncommunkation by g c ~ y u d l f o n osatellites arc correct?t . The propagat ion los, ove r eachd i r ~ c are down-link) isab<tuf 200 dB <II GH'"
2. Rudius or gcos) nchronous orbit is
42250 knL3. An arc of about 17" must be covered
by the e antetma ln the~ t o r i a l pltUle.
4. rhe Po lar Rcgtons are well covered byJJ1e sate I ite antenna. \elect the correct:lnSWcr lLSinllthe CodeS 2iVCn be Oll :- -
a L2 and4
h 2and3
c. l antl4
d. L2andJ
1\vo idcmicnl antennas I km apart nod
opcnlling nt A. ; l0 em 111 an LOS link.huve lUl I0 m high mtdwuyb ~ t w . : e n them . The height of llte :.ntcnnussuch that the fist Eresnel zone is free of
any obstacle. ; hould be
a 15m
h 15m
c. 10m
d. 25m
In the mcasurcmetll of microwaw signalas shown in the given figure. tl te power
meter read$ 0,0 1 The couplerd ~ r c c t i v i t is
l ~ P o w o r : t o r-1--- _,Ax,---- - 1 Sh0t1
JOmW
u. 20 dO
b. 30 dB
20dBCoupler
70.
71
72.
7J.
c. '10 dB
d 511 diJ
g ur13
Asse rtion : (i\) nne JII'Ohlem with tnicmstrip ctrcui ts (or other plunar ctre.ui tsl isthut of t t . ~ l disconumntles ut bends.stop changes in width. and junctions wh1chcru1 c n u . ~ c a dt'!radntion of circuit
pcrfonnnnce.Reason (R•: Bends, step changes in widthand junction d i ~ c o n t i n u i l k s introduceJ>urasitk reac t:utcC\\s tha i cnn kttd to
p h a ~ e and amplitude e r ~ o r > . inpu! nmlou lput mismmch , and SlUnous coup lmg.
3. Both A and Rare true and R is thecorrect explaumion nt'A
b. Ooth A and. R are true but R is NOT.the o r r e ~ t expltmntilln ofA
c. A is tme but R is titlse
d. A is fulsc but Ris
trueAsstnlon (A): Ojltkttl libres are highlyd ~ s i m b k tbr c<lmmunkntilm links lorlasers.
Reason (R) 1\ctivc na turo, of llltical fihr.:sprovides high s p c c t r l ~ purit} of he signal.
a. l:loth A and Rnre true. nnd R is thecorrect ...xplflnntion ofA
b. Roth A und. R arc true but R is NOT.the co n.:ct csplunation ofA
c. A 1$ true but R ls fal se
d. A is raise but R is true.l ·ser tic•ll (A). In an tltramp ci rcu it 11h<·n
1lltC input lCrtttill<JI ()f the 0 11-11n1p h•grounded. lhc other tcnninnl becomes 11
virtunl g1'11ttnd.
Reasn11 (RI : lnt>ul i m ~ d a 1 1 of the np·antp IS high .
a. BoJth A and Rare true :tnd R th<c<l rroct p l a n n t ufA
b. Both A and . R are tru" but R is NO 1'.tho correct cxphmutiuuc•f A
c. A is true but R is falsed. A is fnlsc bu t R. is true.
Asscnion (A) : While usia1g IJJT for thegc ncrution of snw-tooth voltage.. it hu; Illbe bitlScd so thut it can work willtin lhe
ranae of V· I charaatensttc.
R c ~ o (R): Within n rnngl! of Its V • Icharactcnstics, the UJT has negativercsast;mcc and can be used as an oscillator.
a. Both A and R a r ~ t r u ~ and R isexplanation or A
(Circuit tliugram) and St"lect the r o : ~ lanswer:
List I
A. Cascade n ~ c l13. C n . ~ c . l d c c o n n ~ cC. Darlington c<mnection
D. Pnrsllcl ~ c d o nLISt II
I.
,
3.
4.
l ltennal runaway IS not possible in EFI'
because as U1e temperatu re ol' FJ:rrincreases.a. mob il ity ~ o T c ~b. the trllll conductance J n c r e a s ~ sc. the amm current lnc:re;a>ei
d. the mob il ity lncrcnscs
rn. a 74 1 op-nmp, there i& 20 <113/dccadc
lull-olT ston1ng at a relatively luwl'rcqucn<:y. 11tis is due to the
a. applk.d load
b. intemal co mpensadon
c. impl'dance of he source
d power disslpntinn in chip
Tbe input differe ntial stageofop-amp 741
biased nt ubout I0 ~ o ~ A current Such nloll current oflhe inpu t S1>1gc gives
I. high M2. hig h diflcrcntinl gai n.
J low di nerential gai n
4. hig h input 111 1pedancc.
Whkh of hC$C are c o r r c ~a, I and 2
b 1. 2and4
87 .
88 .
89.
IUoJ 13
c. 3 and 4
d. L 2. 3and4
The condition to be sutis licd to preventthermal runawuy in u tnmsis tor amplifierwhere (P< Power disstpatcd at C o ~ c t o r .for, r1 % junction tempcram re. T• =
A m b t ~ lemper.nu re. Q ; Thermal
res istarn:e1 isliT' I
a. - - >-fiT Q
iJP Ih. --J..,<-
fiT, Q
ar. '..-<-
M; Q
dfJI' I- - >-ar, Q
Ctlnsider the following statements:Tbe !unctionofbleeder resi>1eancc in filter
cireuit is to
l. mm main minimum current necessaryfor opt imum lnducro r filter operation.
2. work n; V<)ltage divided in order 10
prov ide var iab le output from the
supply-
3. provide discharge U'l capacitors S> thnttmtput becomes zero whe n the circuithns be.en de-energized.
Which of thesestatements nrc correct'?a. I and 2
b. land 3
c, I Md3
d. 1. 2;ll1d3
Cons ider tbe fo llowing rectilier cirouits:
I t ln!J:wuvc rectifier without filler.
2. Full-wave rec tifier wilhom Iiiier.
J. Full-wave rec tilier with series
inducUUlce Iiller.
4. l'ull·wave recti fier with capacitance
lil tcrThe seq uence or these rcctrfier a r c u i11
decreasing ordoroftltcir npplc factor is
a. 1.2.3.4
b. 3,4.1.2
c. 1Aj.2
d 3.2.1.4
The use uf a r ~ c l l l i e r lllter 111 a capac1tor
citeu1t gives f a c t o r y performuoce on lywhe-n the load