ies electrical engineering paper 1 2001

7/30/2019 IES Electrical Engineering Paper 1 2001

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l r.E.S -{OOJ) 1001 I ol 15

I ELECTRICAL ENGINEERING J

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PAPER-IDlgitnl data acquis ition systems arc usedL Only when "the output of thetransducers is in digital fom12. When physical process beingmon itored is slowly val)ing fnarro11bandwidth)3_ When low can be tolerated4. When hiyh uccuracy


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I. Its' accuracy is "CI')' high, as hlgh asabout 1percent.., U luts a linear scale beccJ(tse a d;Arsonval mo\'ement is used formeasuring tllO output3. It is an RF ins trument and can be usedfor frequencyup to abolu 50 lv!Hz.4. II cmmothe damaged by o u ~ sa. 1 llll\1 2

1.> 2 a n d ~c. 3 and 4d. J and3C o n . s i d ~ ' ! ' the following ~ ' q o a t i o whichcatJ be derived from ac b1idges shoW!tin f iglre I -and Figure ll by assmningMJL-0. 1andR= wL:J "cu = ''.oz2. v01 : 0.05v,3.4. "m5. "Ill = h

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The correct derived equations from thesefigures ofac bridges area. 1,3 and4b. 2,4 and 5c. 2 I!J!d 5latement;:rorroo6y rcpre;;en ts tiLe post accelerationin a Cathode-RayTube?a. It provides dejlcctio!l of lte beaJUb. II i l t c r ~ s e s tl-.e hrightJtess ofthe ttrule

i f he \ligna! frequency is higher thanIOMHzc. It accelerates lhe beam bei\:>redeJJectionJ . I t ltcri!'>IBcs tlte brighuess of li1e trace.oflow frequency sigmll

: of159. If tlte Q-liictor of a coil is measured bYvarying lite freque ncy, lha1a, The plot w ~ Q


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cL SchmitllriggerSpeclmm anaiY7'er IS a comhination ofn. Nnrrow band super heteroclyue.receiver and CROb Signal generotQr ond CROe. O s ~ i l l a t r a n d wave a n r o l y ~u. \ ' l'VM aud C ROTowl numbor of dcetrot\5 tllt can bdaccommodaled in ynrious electron states ina VA lonce bond ofo gwen olid is eqlllll t:o: t Ah)m ic num bt'r of he solillb. Jblf hd numbc.r of atom in the so idc. 'The number of !lonu 1!1 the $olidcl Twice the mnnber ofatoms mhe solidConsider the fo llowing properties

p c r t f l i o i n ~ It> arl all(>)' u.c.d "" ll prceisiollrests tor:I Unitonn resistance2. St:.ble rcsitsnce3. Zero ur iow llue of the exchangot interJctione.ncl'l!Ym a fc'l1om!.mclic mnleri:d irn l)liesa. L3J'gt satur11tion Olognl!tizalioolligh Curie lempornturcc, Hifth melting pointd. Lxgc i ~ m g n c t i s u c q > l i b iWhich of U1 followiug pniB ;,., NOTCOJTllctly matohod'lo. Copper : Diam.1sne1 icb. Sl>dium . Anti f e r r n t ~ ) . ! J l oe. lron . F c r i ' O m : ~ g n ~ l id. Ferrite : FerromagneticFo;mlmt'lleti< hehvior i hnwn hy rhnselr:oos ition rneah when; lhe ratio or i))eatomic diamottr to.! 3d orbilll l di>tuotcrn, In U1c range ofO. S to 1b. In lhe rnse of 1 to 1.5c. In lhc r ~ n g ~ nf t.S CI 2d. Gttaltr t l ! ! l l 2Fcrritcs can be considered mi.u!d oxidesof metal A and ll hving inver.oe spinelstnaclure. l1leir fornnJI:J c-au be written o1sa. A B ~b. 1\!)30,c. AB,O-'d. AB,O,


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Match List I (Magnetic m a t e r i t ~ s ) withList II (Main applicntions) ami selw thecorr.:ct a n s w ~ rList I1\ . Ni-Zn ferriten. Co-sm nllclyC. Ynrlum Iron GnmetD. Mg -Zo ferriteLisl 11I Recording head2 PcrmM.:nt Magn.:tsJ . AuJio & TV transfom1ers4 Memory coresS Mlcrowaw isolatorsA 13 C Da J 4 5 2

~ l l 3 4c. l 2 5 4~ l 4 3 2For a semicond uctor. which one of therouowingsuuct l1cntS is NOT corrccl'la. When an electron and a holerecombi ne. energy must liberat


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A. Zener DioJeR. Pin DiodeC. Tunnd DiudcD. \1nractor DiodeLis t I II. Pust-sw itchiog circuits2. Microwave switches3. Local osci lhuors for radars4. Frequency conveners5. Voltage regulatorsA B c Da. 5 2 I 4b. I 2 5 ,,c. 5 3 I 2d. I 3 5 1The open cirtmit impednnce nf n certainlength ofa lossless line is IOOfl. shuncircuit impcclancc of the SilmC line is also100!1. The characterisrk impedance of heI nc- isa. 1 0 0 ~ 0b. 5() Qe. 1 1 1 0 ~ 0d. lOOnAsst>rtioo (A): 1l1e relauousltip betweenMugMtic Vocl\lr polcllli>d A rutcl lh ity J in free i ra ised. A is false llllt R is true

- - ;;j jGiven that 'fJ " H ~ -olAssertion (A.): ]Jl the equmion, LhendditionnI term ao s necessouv.at R (R): The cqllation wi ll becunsisknl Wth the principle .,,conservation ofcharge.1\. BQth i \ and R arc true and R is th"correct explanati0n ofAh. B


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mhH)Iignmcnt which may CUU$C c.hungc uldecimal number !hereby changing (henumber or bits. G r a ~ code iloes not suferfrom this dfsndvamnge.a. Both A nnd R nrc tmc nnd R is thecorrect C'Xplnnation of I\b. Bnlh I\ nnd R arc troc hLLt R is NOTL'-lrTeCt expJanutiOII of \c. A is true bm R is falsed. A L' fa lse bu t R is true

l f A=a,+ li,+a. . th t va lue or LJ::i.dlaround thu closed circlllarsbown in Ote giveu ligurc isQ y

qrmdmnt.tial' cab le e., ist as~

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.. ., ..A point ehargc +Q is brought n c ~ r u oorncrof two right anglu conducting pl1meswltich :ue at potemial as shown in Otegiven figure l. \Vb ich one of the followingconfigurations describes the total ciTcct ofthe charges for culculating. the acrun l liddin t h ~ ; lirst qundrant'?

Figure In.

h.

c.

-QB0 c

0 BQ c-1.18

-Q .cd.

-Q8+Q.c

+ QA

00

. . . Q" - Q0

+ QA

-Q0

+ QA

-Q0l'lane dctinctl b}' z = 0 carry surl'ucet urrcnt ck n>ily lei, 11m. mag,neticinten,i ty u; in the '" " reginns-a < ; < () and ()< : < ex nre n.>spcc1ively


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a. 1i1 and n,b. -il,, ancl it,c. a"and -0,

- (!, and ii,A solid cylindrical conductor or radius R'canying a current J' has a unifonn urrenrclensiry. The magnetic (ield intensity 'H'inside the conductor at the rad ial dis1nncer' (r< R) isa. Zerob. /12Jrrc. lr 121tll'd. JR' ~ 1 t rThe electric fie ld across ainterface is shown in Uu!' given figurt. The

f a c e charge density on the imerface is s 1 i< ~ 2 l

a. -4 E.,b. - l e .c. - 2Ead. - e 11When air f'O"ket is Lrapped inside adiele c.

Cdl- pbwwa - ~The l e c l r i C lield will induce an emf n lhecoilsa. c, and cb. CJ and c,c. C1 and C,,d. C, and c.A circular loop is rotaljng about the a x i sas a diameter in a m ~ g n e t i c fie ld8= 8 sin llH a,Wb l m' . 1l1e induced emfin the loop isa. Due to tmns l'ormer om ronlyb. Due to mm ionul emf onlyc. Due to a combinmion of transformerand motiona1emfd. 7..eroMatch Lls t I with List IJ and select thecorrec t answer:List I (Law/qtmolity)A Gauss's lawB. Ampere's lawC. Faraday's lawD. J>oynti"g vectorLii l II M n t h ~ m a i c a f etp ress ion)I. V.D=p

- r li2. V E=- i113. s ~ E4. F = q ( E + ~ B }

- - iJD5. H ~ J + - ola.b.

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c. 5 2 3d. 3 2 1In !he relation S = values of Sand r (Where S stands for wave rutio undr is rcllcctif'n cocfticicnl). rcsrcotively.very asa ltolund - lwOb. I w x: and lw + lc. - I to+ ! w1d I to tr.d. - I to 0 nntl 0 10 IIn !he soun:e free wave q u a t ion- ;p nEV,E-JI., e,, p e - .- -p,p cr - = 0fJ1 otThe tcrmn:sJflnsiblc fc1r the nncnuuti1n uf

IVUVCf!Ea. Jl.prr a,

cfb. / 11 "'- j1 E - ,-f}r;:, v,. I ( ' d , i fu Jl,,jJU - an t/01 E,, /1, - .arl'hrce media are characterized byI. e ~ = =2. E,= L.u.= 9,a = 0J. e;;, = -I.JI, = 4.u = ()e, is 1\! lntive pt:rmlllivity, p,. is n:lativcpermeability and u > onductivity.l'hc val ue l l f intrinsic impedances ofthe media 12 and3 c s ~ > c t i v e l area. 188fU770 and J 1310b 317il. 11 3!1 and 18811c, 188.0. 113 I0 ;md 377!!d. 113 10 . 1880nnd3770A plane em wave (,1/,) r n v e l i n ~ in uperfect dielectric medium of surgeimpedance Z ' strikes U . If the refractedem wave is (',H, ). d1e ratios of 1 I E,1md , I i i ,an: rospt:ctivclya 1/3 nod 3/2.b 312 and 1/3G, 3/4 and 3{2d .3/4 and 213Fur a perlcct Cll lldUctor, t ~ field strengthat fi dis lllncc cqunlto de pth is X%of tho field strength at its surface. Thevalue X%' lS

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a. Zenob. 50%c. 31\%d 26%Co ns ide.r the ti,flnwing statements:

I!Jul'l5

The chamcteristic imrcdanc.: of otrWJsmiss ion line can increase wi!h theincrease 10I. Resiswm:e per unit lengtb2. Conductanill! per umtlengtll3. Capncituncc per un it kngth-1 lnduc!Jlncc per uniliCJtgtltWhich of these stpiratilm systemB. Pointing 111'an ohjcc.t 11'ith a lingerC, Ama11 driving aGurD, /1 thurmostuticully controlled roomheaterList III. Moo-made co ntrol system2. Nmural including bJoJogicnl conttol

systemJ . Control system whose components areboth mnnmndc and nnturnlA B C 11

~ l 2 l Ih. 3 I. 2 Ic. l 2 2 3d 2 I J 3Tbc Lap lace trWJSiomt of a transporutlillnlag of5 seconds isa. tlCp(- 5.v)h, exp(5.,)

s+5d l 7ln the S)'S ln1 shown In the GIVen ligurcr(t)= I+21(t 0) . The steadystlltc valueo f he enor e(l) IS eq ual to~ J~a. z ~ r o


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b. 2 110c. 1012d infin ityphuse or he system

' ( ) 5 .IJ s ~ vanes between.r 4s+9a. oand 90b ound - 90"c. o und-Jsoct - 90 and 180

transfer function o l' n oen.ain syste1n s$grvenbyr.(s)=-(l+s

I N) qu st plot of the system ISu

~ ..,b. ~ o..v \..--

'- J ' O

~ ; ; _ : : ___ ..1...d

A second order control s y ~ t o m IS . J o ! l i n ~ dby lhe lollowi ng


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b. j0.5c. Oand - ld. 0.5 J0.5Ir the NyquiSt pl01 cu rs Ihe negative realu.xis uc u distance uf' 0..1, then Ute gaintnargin 1)1' t.hc system isu. 0.4b. - 0.4c. 4UAd..I he lrunsler functit>n of u phase lead

. . b l + al:! Icompensator ts g:&'*Cn y -- w lereJ.;.Tsa > I and I' > 0. The ma.ximwn phase shillprow idcd by ;;uch a compensator isa. tan ' ( tH I )a - 1hJIJI '( ''-I)

a+ I, - ( n + l ). sm --u - 1

d. siu- (n - l )a ~Consider the single n p u ~ single output

e m with stone vuriabloc ~ n t a t i o n :

. l " = [ ~ -02 - " + [0 0 - 3 0Y=[l 0 2JX

The system isu. Neither conlrolluble nor observableb. Conlrollahle but no l observablec. llncontrolloblc but observabled. Both controllable and b > ~ ; kA lruticular control system is described bylhe following state equations:x=f 0 1]x-t[0]u1lfld )'= [2 oJx-1 -3 I

lmnsfcr runction or Ihis .-ystcm is:l ' ( ' ) Ia. U(s) 2s'+ 3N+lr(s) 2b. ~ ~ . - " - -1!(


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llneariscd autonomous second ordersystetn and select the correct answer:List IA.. C o 1 n 1 1 conjugate pairB. Pure imaginary pairC. Real and equal but with opposite signD. Real distinct and negari veLis1UI. Centre2. I'OCIIS poinl3. Saddle point4. Stable node5. Unstable nodeA B C Da. 1 5 3

~ 2 I 3 4c. 2 I 3d. 1 5 4 3In order to use Rou tll Hurwitz Criterion tordctennining the stabil ity of sampled dara-vstcm . the chomctcrist it! equationI. r G(z) ll tz) = 0 sbon ld be mod i ied byusing bilinear uans fonn of = : r+ lb. ~ r -,._,c. - -- - r+l

r+ ld. ==--- 1The system matrix of n.discrete system is~ ~ !!'he characteristic equation is given bya. z' +5z + 3 - 0b. z' - Jz - 5=oc. z'+3z + 5= Od. Z.'+z+2 = 0l11e current ln the giveLt drcuil with Hd"JlCnden t voltage sourc.e is.. L_____.J'"

..

a. lOAb. 12Ac. 14 Ad. 161\!'he va lue of resistance R shown in thogivcn figure is

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3 . 3.5Qb. 2.50c. 1!1d. 4.5 0An electric circui t with 10 branches ami 7nodes wi I hawa. 3 IO!'P c q u u i < ~ n sb. 4 loop .:quationsc. 7 loop equationsd. I0 loop equationsPor the circuit shown in the given ligure.the current thrOlmh L and the voltage

a c r o s ~ arc e s p c ~ t i v e

a. zero and Rlb. I and zeroc. zero and zerod. land RlFor the circuit shown in the. given ligurc.when the vohagc.E is 10 V. the current I isI A. ll'tbc appl ied voltage across term inalC-D is .I00 V, u.e short circuit CUri'CIItOowing through the tennim!l AB will be

a. II.IAb. l Ac. lOAd. IOOAI00. The Thevenin's equivalent s t a n c e R,nfur the giwn nC>twOrk is

~ 'a_ IQb. 20c. 40d. lnlinily

101 , For the circuit 5hown in the given ligu rcthe current I is given by


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a, 3Ab. 2Ac. lAd. Zero

I02. The vaJuo 1>f V in the circuit shown in thegive1, figure is

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..t .. ,:e:na. IVb. 2 v~ 3 vd. 4 vThe Nortons equivalen t()!" circuit shownIn Figure I drawn in the citcuit shown inFigure II. The of "1$, ancj R,q inPigure II are J"espectlvel)(>('~ ~ " ' J}pn: Qa. 512 A and 1 0b. 2t5 Aand 1n~ 415 A and 12150tl. 115 A und 101()4. A pule of driving point ad 111illll11Ct!Unci on impliesa. Zero current to r 11 tinlte value ofdriving voltageb. Zero vo ltage lor a lini1e va lue ofdriving currentc. An open circuit condi tiond. N ~ n e or (a). (b) and (c) mentioned in1he questionI05. The driving point Junction of the circui1shown in the given figure when s-+0 ands->>, (the e.lemems ure IIOnllalizedl willruspcctiw l} be

~ ! ! . Q + 'i'l'1.:(.,_.... OJ r lN

a. J/sand 2/sb. l/, an


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C'auenmd Foster tbnns or e a l i z ~ t i O I 1 S areused on ly fora. Driving point rea ctance functionsh. Transti'n reac tance funct ions vc. Driving point impedance functionsd. Transfer impedance functionsFo r the given driving poiot impedance

s + ' ~1\m.ction Z (s)- ( 1 ) , the circuits 2s -. 3i ~ . a t i o is shown in the givc.rt figure.Then the values of L and C are

'"$pect vclyz t ~ ca. 0.5 and 5l>. 2 and Ic. 4 and Id. 4 and 3

113. The h parameters h11 and hn are related toz and y parameters asa.. h,, -= .z,, aud h21 = llz.nb. h11 = Zt l nnd h11 = ~c. h11 = IIY11 and h::z= 1/zud. hu = 1/y,, and hn = Y22I 14, The ilriving poim imped1U1 ce7. ( ) .v+l 'lh . ... IIII =-- . C SYSicni IS Jlll l13 y AI

.} - - Fo r an,r - 1signal cos t. the steady state resptmse is" I/ .J2co(t-;)b. C.OS/c. co{- : )d. 11 ../2 COS I

a. 1116 fb. 1/ 12 fc. 1/8 f'd. 1/4 F1151. The resonant frequency of the given seriescircuit is

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/" '" ' " \~ r - - -8 lH lFa. l / 2nJ311=b. l / 4:r.J31f:t . l / 4tt.filf=d. l / 1.fi -Izl'ho trnnsfcr functionV, ( .

ies electrical engineering paper 1 2001

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