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3,

4.

5.

1 ul. 15

ELECTRICAL ENGINEERING 11te mean square value of the shot noise current n Varies mversely as average current b. Is independent of average current c. Vanes as .javerage currem d Varies directly as average current Tbe characteristic impedance of nn a~r dielectric coa~ial line is 17!'1. If the atr is replned by s melectn~ wuh e, =2,28, the chamcteristic iJnpedanoe will be a. 33.80 b. 510 c. 1160 cl 1750 In India, the nU1~11num frequenc)' deviation fn commercial I'M broadcasting signals is about. a 5kHz b, 15kHz c. 75kHz d. 200kFh l'he c()re din meter of a sLeJ> tnde.x OJ)boal fibre rages fom1 '" 300 Jllll to 500 pm h JOO p m to 500mm c, 30() nm to 40 11m cl 2 pm to 200 Jim tn a Mes'h topology or commu1nca11on networl

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12

13.

14

l5

/l ' = (a. ll,, )J (

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,.,

21.

I A n R= l 0 and nn J ._Jfl in pnmllct c.. A n R - lfi ru\d tl c._= !.J.~ Ill pa.ro1.1let

3 d A n R = 0 .t1nd n r ..._iF in Keri~ TIc. l.ftpiDC~ trattdOr-m o r cutre.t ''' tUI RLC se-nt-s c rc:ut '"ltb R= 20._1.. = lH t'lthf (=J..F IS

I / (.)~ s'+2s +.2 :!

n 1e \:01Li);t:! _ru;:~.o,s ll.t.e .._nJltC-l"-'1 L wtlJ be n r'H1111 (1) h 9 1 C"O:-il 11(1) c-.. , ' (nt/ -4 co~t ) u( t ) d r ' (l - int) 11 (1) The F'Qnrier- transform nf tmil lfJtOHI~ fun S)stem 1.5-

u HH -UJ}(n) " [:( -kJ Ur}(ll)

~ H*r -(~)l

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30

a, 10 dB h. :!OdB c 30dB d 40dB The sySlem y(t) = tx (t)-4 IS a, Non"hnear. time-8f}'tng lind unstable b Linear, tiJne-varymg and uns~able c. Non-linear. rime-mvanam 11nd unstable d Non-linear, thnc-vruytug ww stable Consider the tb ll owing statements abou1 the .z,.transform, X(z) of the sequence x(n)=2' /ill' n 20

=0 )rn ~ l-1

.,_ 1 N(:)= l+ I uoc 1=1>2 1-a

3 I .\'(=)- , I fl(}( 1: 1 /1 SljyJal ofbandw1dth 4 kl:t:z is recorded m a tape re~order aL normal speed. lf J'or lrQnSmlsston purposes. the r~order IS replayed aL 4 bmes tl1e nonnal speeclthen the transmiSSIOn bandwidth w1ll be a. 16kHz b. 8 1dlt. c. 4kHz d I kHz

0 )I

3l

::;~

34

a. It has a de val ue. of ;r b. llhas a period o:f 2s c. Its fundamental CQmponent has the

magnitude2 d II contains only even hiini1otii~s In LED, lighUs emitted because a. Recombinatiou of charge carriets lakes

place b Diode gets heated up e. ltght fallu1g on ~'" diode gets

an1plified d L1ght gelS reflected due ro lens a_tion f"tn auy amplifier configuratu.m blsmg a BJT. the mpttl Impedance R1 1s a. II, (t +h,.) b It

1- h.A,

e. h,

I +lr1.4,.

d -''--l ~ltk

1~1 1 l f -t

Frequency respone churactenstlc of a single-stage RC coupled ampbfier IS showu 1u U.1o above fig w-e. The fall m gain at both ends of the charact

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35

36

37

& --g 0 :-:25

Li>:I JI I Oarhnstro ~ C.ucmdr l Pltmllcl 4 C'.....,._'Ude

,, B (" D n ~ J I 1 b l 4 2 I , l I 2 d I 3 , I The op"llmp shown m I he nbove ctrctlll hn.; wn lniJllll tmp..'danCI! of I M 0 And 1111 Cl!>ctllggp J!Wn ur 10' 1 he IIIPlll nnpednnc" -."" by the ~urc:c v, IS

.---1~ ~ r~>-.--o I ktl

~ '=" ~ a 10110 b. 10"0 c. lOll d. lkfi Tile J!lllll of o RCl!JliiYe feedback nmphfter 1$40 dB. (f the anenuauoo o[ Lhe feedback pnLh tS 50 dB. then the gum of tho nmpltlier without leedbnck 1$ a. 78,92 b 116.31 c: 215.51 d .317 23 The (QIIO\\-injl lnhle pr

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4J

45

46

For the JK llip-flop shown in the abo~e ngJJre, J~Q -and K~ I If 11 is initially cleared and then clocked tor 6 praises, the sequence at the Q-output will be a_ 010101 b OloOOO c. 0 11 (1()1 d. 0 10010 A full adder oircuilm~y be construCled by using a Two 2-i nput AND gates alld two l -

i up1l OR gat~s b. Two half adders snd a 2-inpul AND

gate c, T1\oo hal r adders and n 2-fnpul OR gate cL Two 2-lnptil AND .gates and two 3-

i nput XOR gates If (a II)~~ ( 152 )s-then d1e value of base x' is

b. :. c, 7 ll g 'l'he rnnge of nnmbel'll that can be represented in twors complement rnodd

wi~1 four binary digits is ~. JSw ..- ]5 b S!o-8 o, - 8to 7 d - 7to . 7 Given rhnt N is the acrual number of iusuuctions execuJed aM CPl is the avera.gc oumbe1' of cycles per iustructi ou_ 1hen a, Bolh C'ISC (Compklx instruction set

eompulor) an~ RISC (Rcrluced instruction set c-omputer) pr

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53

A. ,, c . ~--(! I

B p (! ~ ,. c

p &J 0 I' II

"-.V ~ I isl II

I ' 1- {!

2 0 ----1-/'Q

1 ~ 1-1'!)

4. Nj 1- 1" A B c lJ

n. 2 , I I b 2 J 1 ~ ~ l 2 1 4 d 3 2 J Tilt lulli Step I""JlOIISe Of 11 Sd:Oild order

l m~nr >')'~tem with ZerO tnttial ~talc> is !liV"Il by l ite diuuplug rail(\ und ii !C '"llil1lJJr-tr ['\ loJ~ (bl~-

(

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58

59

61

H. 0} Wbicb one of the t'ollowwg statements rcgarclmg the state tnms1hon mtnnx is currectl 1L jii(O)~O b. ~ 1 (1)~~{7) c tl(ll+t, )=tl(t,)+!'i(l;) d fl(11 -11 )~(t, -lc,)=(tJ -r,,) The fltal val ucoffunctton

' F(s)= ( ~ - ) 1sequal.to $ s +~'+2

a. Zero b. ~

.5 5

c -1

d 5 Consider the followmg statements: I. P-D coutrl).llttt is l'tjwvalcut to a lugh

pass liltc , 2 For be1ter performance. tntegr;d aotion

IS Initiated before derivative acttoll 3, High. proponlonal gam $ :m alternative

to derivative actlc>n .J A practical PID controller uses n high

gam. ampltner u1 dte forward pach. Wluo.b of these statements are Not correct? 3 I. 2 and 4 b 2.3nnd4 c. 1and3 cl I and 4

U' Lbe bndge sbowo iu the above f1gure is balanced. tben the v~lue of the inrlllct~nce '1 ' will ~e a IOO mR b :!0 mEl

62

go{ 15 c. 2 mJ-1 d. Depe,ndem on supply frequenc~ (J) T'vo smuso1dal SIJ:tnls of 1ieqnencr f Hnd 3f are applied as x aud y mputs respecuvely to rutosc~loscope Wbicb.oue 11f tl1e lVII()wing patterns could IJe observed on the screen? () CXJ (b} I

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66,

67.

69.

B. Tempt:111Wte C. Static pres$utc D. ('un..:nt Liot U I, V MiAI>Ie reoi.ostance ;t Hall ell' eel 3. PiC'I.~Jdle~tri~ clicct

~. Vntio\llc: reluCUln,.. 5, 'Vorin~le caJliiCil:lnce

A 13 C I) u. ~ I 5 7. ~ 1 4 5 l ~ 2 I 3 5 d. 4 j 2 s A re5i.stuncit ctUlJIUl assuming a Ilouh touvcrtcr'l ... 5 b. 8 c, 4Q d. 2.55 Given lhnt ,.= Po!i~ nbi lity N Number of dipole~ lofi1 c, Rol~t.ive dlulcclr'ie cnustJtut and

~diclc"tri~ constant ot' fl'ce >JI~Cc. the clau~lus mossoti relut!on is

c,-J N11, II. --=--

s,+ l ~SQ s,-1 .Va h. --=--G, + 2 .3cll ll, - I 3t;0 c. --: -e, 1 2 ~'r'

,L c,-1 _ J'

~cn.;tivo t~ humidi~ ~nd temperahon:, 3. ltK npplic.1linn requin:s > con~!Jnl

supply ofl lqul.d ltcllum. Wlii~h of lh>tenl

b. Gro\\1h of favorably oriented domains at tb" colC.omiller tho f6Uowing sbtclmtnt.. ,\s compared tt Si single a-ystnl grewn b) the ('l, method. the Si sing le crysi"OI grown by lit~ FZ welltntl suould luow 1. L~c-r oxygen tonlnnlinDtion .. 2. Unifurm dQping throughout the length

of the crystal. :>, ~l!ln: substi~tion I)Mbon nloms in lltu

i>l)'ll lol. Which of the11e 51oli:ments nre c:o~l'/ a. I, 2 and 3 b. lllltd 3

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c. 1 and J d. t !lltd 2

N For dte cpitoouct~l growth of matcn(JI M to be possible on U1e subsl!ate of mmerial N. a. The lattice COil.Siants of M a11d N n\USI

be same b. M and N must not react with each

01her c. 1'he cocffieienlS of themtnl cxpnnsio11

or M nod. N must 1:>c cttunl d M must ha1c ~ lo1~or dtJ\SJLv lhan N

75, Silicon mtride is ttsed as Lhe passivntiug cover Jnycr iJt MOS h~cllnolog) bec:nuse il IS a. Ea~ 1a deposit b. Rcsistnulla axiali 1011s d. An excel lent mask for gaJJ,um

76, The. cconanuzer. a campcn~nl of steam power plants, is n heaiC-"changer utihzmJ:I the" nslo heal o[ 0 Blccd-slcnm to !teal Lhe .fued water b Fluc-gns to helil the ft:ed water c. FJue-gns 10 heat lhc ail; goi ng into (h~

boiler d Flue-gas to heal 1h~ pulvcrl7:ed coal

77 Consider Ute iollowing stalemeii!S aboul die ulility or delta~aruJecled tertincy windings 111 sblr-star connccl.cd power trnosfonner currents I rt makes !\Upplv a,ailable for small

loads l It pr01-idcs la11 reactance pa01s for

zero sequ~nce 3 II is (Jt;cd 10 suppress h

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84

86

J 2and-l An overhead tral15mlssion lme havmg 5urge impedance z,' IS tcnnjnated to 1111derground cable n surge impedance '1..2' The reflection ooeftlctent (or the travettng wave at the j~oction of Ute IItle and cable is

a

b.

d

z, + 7., z,-z,

z. Z,+Z, z,-z, 21+22 z,-z, Z1 + Z1

Rmg mam distnbu1ion is preferred to a radtal system because a Voltage drop 111 th~ feeder ~ lc:ss w1d

supply 1s more reliable b. Volutge drop in the feeder is less and

PQWer lilct'or IS hogh c. Power factOI' LS lug,b and supply os

more rohuhle d Power titctol- tS high nod system LS less

expensive If ti1e limit ~m=t ~ 3000 A tor a. relay l\'llh a plug senms of SO% and CT ratio of 1000 1. the pl~-~g Sellin~ 1uultiph~r would be a. J.5 b J c 4.5 d 6 Match t >st I (l'rotectrve schemes) wr1h L1sl I r (Equipment) unci selec1 1he correct j!J'Iswer ttsmg the ~odes goven below lhtt lists; LisLI A 'Mho relays B lnven;e tune over current relays C Dlffcl'ential l'elays List II I Generators 2 Tral15mossroro hoes J Motors

A B C a 3 I J b_ 2 3 I c 3 2 I d I :J. 2

87

88

89

90

I I o( 15 Reversal of power now m HV DC lmk by cotnrollmg the :fuing Mille. smmlmneously al both the ou'iettet stations results in a, Reversal of vtltage polunty cyf HYDC

pole b Reversal of eiliTent tn de Link c, Reversal of cuneut m de link. as. well

as reversal of volmge polarity of HVDC pole

d Neilher reversal of ourrem m de lmk nor reversal ru voltage pol11tity Df HYDC pole

h1 terms of plant powers PN and P,.. and loss cocrflcu~uls B.,.,, the tot-al t:ransmJSsoon loss ' P1 ' IS

,\ ~

a. L:I B., I~ M J II I I I

b L:IJ~a ... Ill l!tl N >!

e. L~>:JI_ I~ 1M .;.I tr: I A \ '

d. L I: 2P .. B.Itj ... .. 11 1

The average value or de voltase of a single-phase semi convener uo1der contlnuous.cQnduction IS a

h

c.

8(2+cosr.t) 1r

J1J' ( 1-COSO') If

Ji~(l+cosa) 2;r

.j?.l ' (l-cosa) d.

~:6_F 8 ' -~ --~ : . ~ '

' The smusoodal distn'buted balanced Ult~ phase windings shown >tl the nbtiYC figure are supplied Wll.b balanced tl1ree- phase currentS,

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91

91

93

I, " 1. sin I - ~ ), ' ; 1. sin ( tJJI - 5: ) and

( 5,T) 1,. = fulSIO tql t 6 1\ 1 the angulnr msta11t fill !!_. the vnlue of (, angulllr posiuon ' 0 ' uJ' the rotatmg 111mf \)4, r wuh resp

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'IS

c Net forward rotating Owe ts equal tO the net bn.ckward mtating Au"

d Forward flux produeed by rotor current is equal to bochwrd !lux. produced by rotor current

1\ 3-phase delta connected squll'fel cage mduction mot!lt has a stJlrtmg catrenl of { 4 aud a starting torque of r, at rated voltage If the smrtmg current and staning torque while the motor Is stntted through smr-delta )'tarter an(! auto-transformer (with 60fo voltage) starter alternaovely. llfO l., ttud T, and r... and r,,,.

t~spectively. then

equal to l I

a, 'J3 0.6 :-;r; 0.6 b. !. . 0,6 . ! 0 36

3 3

c _!_ . 036 ~ 0.6 3 v3 I I d ~-0, 36 - 0,36

-.JJ 3 99 If a 3-phas" mduct1on mol or and a 1-phase

Induction motor of the same. kW mung and same winding voltage are compare'the phnse relntJOn~ of curre.nt ' I ' with respect to the voltnge V "" ts

a. Zero b. 90' lead c. 90" log d l &o

102. A-3phasc V/ t. trtutsfonner has pe< 11base turn calion K nnd lme voltage r:llto K I If the. vollagu of 111 winding lags the voltage of Y winding by a ungl~ ~ . then K, Kt and

~ are related as a. K, = K (IIIII 1/J = 30"

/{ b K, =73 O!JJ; = -30" c. K, =FK a111t = Jo d K1 =..f3K and ~ = 30"

l!JJ . 'l'wo transfotmers X aud V wi ~> tdeuucal raU"!,'S 11ncl dionenstUl; have 0 8 mm and I ,2 mm thick lamtnauoos respectively, JJ' R,11 and Xf,, are the magnetizing branch parameters m the e

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1L 1.2 nnd3 105. Opto couplers arc used in lronsi!O tJ-:11\cun-ent for tinite tl'iggenug angle, Which nflhese ~~~tements , ... , enrrect? t/> b. fL=t/>

II uf l l c. a " a d. a rnnge> lofm o to til()

110. As.~eotion (,_1.\ )~ In de l( dQ .1t.ep Jown chopper. frocwloceling dioao is mnniliotory fCJr Rl loads.

R~:osou (R ): A part of -ncrgy fed 111 lbc lU, lod t dislpxted in the re. the

1:orred ~pi~ nation of A b. Both A und R are true hut R is NOT

the wrrec~ ex'pl>nauon of A c. A i true bot R is folnd Ute Ouclu~tiliS h:rminating voltllge tmd arm~ture .:..trrent arc to l>c recorded for wmputing X. ' ;nod Xq

Reoo~un ( RJ: Dunng the ~bp t l!lll. a slip frequency voll:lge is indicntcd l1Cf05S the open field cm>uil termon~ls th~t could be

m~sured by connectlng a vollmcter ncross IJI~"" tignal i~ out o'llquircd fimu lite otltet end to pomuJt lripJ,Jin,!!. a, Botll A and .Rnro Into rutd R os U1o

correct e,xplanotion of A h. BQlh 1\ Md R

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I J3. Assertion (1-\); 1il)'ristoried CUITilcully ~low p(l.!!o iiltc;r, ~. l1111h A nnd Rore true and R is the

curroct t.'Q>I;JnQtion or A h. Both A and R ore frue \lui R is NO'I

1l1c correct xplauatiou of A c. /\ is true hut R is fu)~c d. A IS false but R i~ true

116, A."crtion (A):St:tbil~y is major problem in closed loop control SJ'Stem. R~a~Qn (R): lntroduetion of feedh>ck uO'ect~ l~e lt>cation of poles ol' open-lvop ~ystctll. n. Bo!b A and !tire true and R is Ute

correct "'1'1nnnJlon o.f A b. Bollt A aud R are true but R js JIIO'I

tb.t: cuncct cxplunntion uf II c. .'\ is truD but R is (h~: ,1. A is fal.s.: but R is IJ'ue

117. ,\m'rtlon (A): The -auto meremenl ut auto decrement ntude arc sdtaom fuunil in 1110dcm procosurl!.

!Sol u R~>tson (R): Using two instr~~ctions Instead of one provides Oex:ihi licy in fmplctncntlng 11ipelinc. a. llolb A and R:lre lnre and R is the

cotreel "-'