IES Electrical Engineering Paper 1 2008

7/30/2019 IES Electrical Engineering Paper 1 2008

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1.1':.. tO BJ) 200 8 I ot IJ

ELECTRICAL ENGINEERING J

2.

3.

PAPER-I

Conside r the fo llowmg sta teme nts:When all tbe e lements in one row of theRourh s tabulation are zero then th iscondiuon ind ocates

one pair of real roots l\iU1 op.positesign m s-p lone

2. one pair of conj uga te roots on the1111agi nury S..\:IS "'s plane

3. conjuga te roo ts fonni ng a quad rme ins-pl ane

Which of the statements giVen above lslarecom:cr?a I onlyb. 2 onlyc. 3 onlyd. 1. 2and3

The low freq uency and high freq uencyasymptotes of Bode magnitude pl01 arer e s p e c t i v e!~' -i\0 db/deca de and -40dbfdccade . Whut os llo" type of tho syste m'/

a. Type(lb Type Ic. Type Ud T ype IllWhicl 1one of the fo llowong lscorrec t'!If the ope n-loop transfer funct ion has onepole i n the right half o f s -plane, U1e c.losedloop sys tem '"II be stable rf the Nyquistplo t ofG Ha.


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lf l

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13

1o detect tJ1 c posi t10n erro r in '' po liitionco ntro l ~ Y 1 o m, whi


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19 .

20 .

1J .

22 .

23 .

c, I (l l

d. lOl l

The errors introduced by an instrument fallln which category?a. Sys1ematic errors'b. Random cnor:s

c, Gross errorsd. En viJoruncntal cn o n

" ~ ~ . b1C l D l ' ~ .) fl

tl l fll! !>nll tl l -

1 l"avefomt sh ow11 i;tl he figure ab\lve,is fed to a d. t . .uruneter . Wl wt i ~ lhereadin g shown by the me ier 7a Zerob . 50 m - ! \

c. 75 mAd. 100 mAWhkh one of lhc foUowlng instruments iscommon ly 'USed to mea. Voltmeterc GaussmeterII. GalvanometerW h at is tlre radiation r ~ si s t a nc e o f a di polean le ruta /J20 long approximatel y eguall o7a. 2 0b . 40 0

c. o.6nd. 20rl

!\t . T he i mjled ru1ce of one is Ihe c011Tf)lex

col]iug ate of l he olherc. Tllf r unpeda nce of 011e is equal 10 that

oF the ol}ler

d. Only lhe resistive pa n s llf both are

equ>llColl.Sider the JoUowing statemen ts fortrrutsnussio n lines :t . When transmi ssion line is tenninated

by its characte listic impedance the linewill no t have any reflected wave.

2. For n finite Hne te1m inru.ed bjr itsd t a r a c t e r L ~ i cimp edance the velocityand curtent a! all po,i.nLSon Ute 1me arcexacdy same .


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3 . For :1 l os s l ~ sh:ttf W3Ve lJ"ans mio;s ionline th e in11UI in>l>l:tinnce is not et1ual!oload i:mpeduncc,

Which of the sL1te.nen ts gh cn above Mecorrccl?

a. I and 2 onlyb. 2 and J nnl)c, I ond 3 onlyd. 1. 2 a nd 3Wllich o l' tl1c follt1win!! i ~ v c c ~ J rCjll>ntity?a_ S tand ing, wa ve ratio on ly

b. Rellection codffio idlll onlyc, Gaind . Standing w:we ratio nnd l'eflec:tioo

cofficieulWhat cause$ cloclromagnetic ws vepolarization?a. Refractionh. Retlectionc. Longitudinal nature nf electn>magnetic

W : ' J V ~

d. Transverse n ~ l u r eo f eleclr>ic fie ld intensitya. becomes approximtcl y haIfb. gels approxim>lely doubledc remins nnchn sedcl. c:nnot be determinedCora ide.r U1c foliowiog U u~ . . ,equations :

I. \~

2. v

3. \ ! B=OWhich o f the llb< JVc appellr in M a~ l \ ' o l l ' secluatiun s?lL. L~ 2 and 3

b. lm d 3 on lyo. 2 and 3 onlytl I and 3 on ly

33

35

36

37

38

.t nt IJWhich one of the fo llowing modesha< the high"" t cut o ~ l 'wa vclengtJ in arcc\.'l.ogulor wavo guide ?

a . TE1b. 'I'F.o,c, T ,\ 1~ ,

d. TM11A long straight wire catTi


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4, I ltnd 3 ()nlyd 1 . 2 n d 3

fh e lnptu- output r e l ~t i o n ~ h i po f svs temls. i v ~ ; ;n by

usfllnll of ffl.t)c'"'l i$ equalto:o. f( a)

F (> )b.

(.)p l a n ~ .Ute


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n. infm lle

b. greater h ~ nzero but not iolinitec. ~ e r o

cl less than zc:mu the poles uf " ~- st e r n lie 0 11 th nt ro l l~ r is

5 1

51

o a ~ . h -1 11 1 \ . .1. ~

b. K1 + (K/s)c. (K, Is)+ K.scl K1,s 4 ( K~ ~)G iven th o m:atri .x

A - 0 0 1

ro 1 ol6 II 6

the i g en 1a l u ~oft\ are

-1 . ..2 .. 3b. 1, 2.-3c . 0. 0, -6

d. -6. I L 6l'he s u t e -v a r ia ~ k descn ption uf a linear

au tonomous Syste m is s= A..\" where. X1s a t wo - d im e n s i o n : ~I stat e vec tor and A is

- ro21mau-ix 8'""" by A= _2 0

n , ~ po les uf t ~ syst.


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h. Bolh A and R ar e indjviduall y true hutR " no t rhe correc t ex plana t ion t>r A

c. A is true t>u1 R is falsed . A is fn lse but R is trueAllllertion 1A): Pi.,-t od cc tric tr:on sduccc ~ n be used tor measurern nl L)f bo th toticand tl'yoamic pht:nt>meoo.Reaso n (R) : Pie-1.oelectr ic tra nsdu cers havewry good hlgh freq uency respo nse.a. Both A and R ~ re indivi duall y true and

R is U1e con-oc.t x p l ~ n a ti on of A\>. B

b. lloUJ A ond R a rc indjv[doa ll) t r u~ butR is not tl1u corn.lcl c." t~ u

tl. A s fn c hut R i~ tru el'wo coi l a re co upled in uch w ay tha t

U~ enoutunl iucluctMce be twee n them i 16m ll . I f Uou indu c iJ1nccs o f U1c co ils . r c 20mH and 80 cuH respect ive ly, thecoefficie nt o f co up ling i> :n. t),OJh. u .c . 0 , I

d, (1,0025

For a Lansmis.o;lon liJie load m31chlng overa range ofJ ruqueneies . it is boslw tlS C

oti

,7

7 o f t ~

aL Bn. luntran sfonn er

b. Sinslc _.-tub of atljus L! blo p0$itionc. Double stubd. Brood band cliroctiunal co upler'I he copac itance of '" ' insula ted conduct ingspbetl! o f rnd ius R in vocuum js ;

a . l n s.,Rb. 4 1!c 0 R

c . .lm; R'

d . 4111;0 R

' I \' ~ ' matoria ls having lompen >turccuc Uicicu t " f 0.004 aucl 0.0(14 tespcc ti vci.V"" ' joi noo in .er i 1l 1d ovor. >ltem perature coef'Jic i o:>fundam cntnl tUider >lClldyst ote co nditi onwill bo :

a. l50 ob. 100 1.

C. SO'lo

d. 3 : 1~ o

In a two c lement ser ies ne twork. thevo ltage n d onrr ent respec thely are give nas. v(l) 50 s in (314 t ) 1 50 sin (9-12 t} Vi(l) 10 in (3 14 t l 60 ) 8 s ill (942 L 45") A , than Ute power fac tor of th enetwork is appr oxjm alely

. 0.9h. 0.6c. 0 .3d. Q. t

represe nts n:

" RL impedan ce o nlyb. RC impeda nc.: only

t + 2)( , , + 1 Xv ~ 3 )

c. RL adm itl4n ce and R C impoo aoc.;


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d. RC admittance a nd RL impedmccIn a CRO tlSligmatism is :a. A source of genera ting taSI electronsb. A medium lb r absorbing secondary

emission elect ro nsc.. An additio oal locus contro l

d. A Ihno-dcluy con trol in the verticaldeflect ion syste mIn an clectromctc t, the movable plate is I Iem in diame ter. When 12 kV is :lppliedbehveen the movnhle p l a t ~and the lixedplate, the force is 0.006 N. The chang< inC 8p ac it HI 1C ~ fo r 1..5 11ll1 1 1 1 1Q V ~I 1 l C t' l Of l h ~

movable plute is:a. 0 . - 1 ~ J0' 12Fb. !1.37 IO .,;F

c. 0.125 ' IO "F

d. 12.5 ~ 10'12FContinuou s recording of 11 signal Is notpossible in aa . Magne t ic tape recorderb. Strip cbrut recorderc: . X Y rec(lrdor

d. Galvano merric reco derl'he successive approxima tion AI D outputfor a 4-bi t convener to a 8.217 Volt input( if the reference is 5 V) will be:

a. lJO Ib. 0 11 0c. 10 10d . 100 1

,.

In tbe circuit shown above, wh" n is thepower ab sorbed by the I n resis tormaximum?

a. R Ob. R - H !c. R - 4 ntl. R >

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r-=-h~ For c i r t ~ d ~shown above , the b lack boxcoma ins resistors and independent sources~ >1 1l y .The current I is 3 A artd 1.5 A fcr R= 0 and 20 . respecti vely. For R = 10 .what is the currem I?a , lAb. 1Ac. 3Ad. 4A

What is the Lapla ce transform of afimc.tion (\ (t-1) 'Ia. 2b. 0

d. 2s

'"

Who! i:s the limeal>ove?a. 0.5 sb. Is

c. 2s

d. 4s

rcotlStnnt of the ci rcuit

In the n elworl\ ~ b o wn above , il is g 1ventv

UtUI v = I V and - - = - 10 V/s nl a time t.dr

where 1 is the t i m ~a fter t h ~switc h S isclosed. What is the va lue ofC?a . 0.05 Fb. 0. 1 f'c. 0.15 Fd. 0.1 F


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A ser ies R-L circuit is to be corule ) V < Ih .

Which one of the lollowi ng is correct ?The tran s ient curre nt wi ll be absem if thesourt:e is connecte d at a tinl e ~ ~ su c h that

a. trJ/ 0 = 0

I (!)1.:. ru r.,= tan R

d. tn 10 bas a ny arbi te r value

A se ries RLC circu it is sw itched o n 10 astep vo ltage V at t = 0. What are the Init ialand final values of the c urrent i n thecl rcuit. respec tively'?a. VIR. V/R

b. Ze ro, lnliniiyc.. Ze ro, Zerod. Zero . V/R

What does t he f unctio n I\() ploltea in theabove figure represent?

a Unit t e plimc tionb. li n t impu lse functio nc. Unit ramp functiond. Unit Parabo lic functionA lossy capacitor is r e p r ~ s e n t e dby anIdeal capacitor C with a high tcs istance Rin p a r . ~ l l c l .What is the Q of the circuli litfrequency ro?

a. mCitb. 1 / ( c ~ CR )

c. luCfRd. ltl(coC)

A vol tage of V = IOOL30 is applie d to animpedance 2 - 3 j4. WWch one ur OoetO II(lwin g is Lhe power lriang:le ?

L:J m'"L_ l f 'mW

&2.

83.

114.

85 .

I) of IJ

d.

J ~ v 1000 w

R ; J n

C:._____,t(i)VL.O

Fo r the netw !lrk shown nhovc . if theCltncnl i(t) = J2 sin((!)/- 30). then 1vhm Istl1e value o f R?

a. tnb. 30

.J3n.d. J ../30

A co ntrol system has a transfer func tio11Ktl ~ O.Ss)(l+ 2s + Ss ' )

.


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b Sumdy s w r ~error IS a measure o (b)'Stem accuracy "lien u spcc1 fie 1ypuor input is applied to 3 comrol system .

c 'I he. error constants do nm giveinformarion rcg;Ltding stead) slulc0rror wben inputs are other thru1 step.mmp andparabolic

cl Stead y ~ l u r eerror docs not provrdcinfonnnuon on hm1 the error varieswhh lllllC.

Whrch one of the following is the mostlikely reason ror lurge overshoot rn ncunlrol system '>

a. lll gh gam m a y st ~ mb Presence or dc.1d time c le l n ~ m a

sys temc High posllwe correcung torqued High retarding mrqueIn the umc doma in ana lysis of feedbackcontrol systems whrch one parr of thef'rlllowing is not o r r e ~ tl y matched?a. Under d ~n l f ) l . ' d Mmrmi1cs rhe eft'ec1

of nonhnllarnresb. Dommam l'oles - Trnnstems dre out

more mp1dl)c Far ll\\e. t) ' poles to the lei! half of s

plnne;- l'mnMentSdie out more ruprdlycl A pole nilllr to the len uf dominant

complex poles and ne-.tr a .rero.M : t g n i t u d ~o ft runsi I)

2(s - 1)

(s 4 3)(.v ,. 1

3(s+2)

(s+3)(s-4)

Select the correct UUS\\-et using t b e cod(!g.ven belowu. land3b I onlyc land3d None

QO_

') t '

92

lu or i Jc

~ f . . -- -

0

The tronslcf 1\.inction for the d iagram

shown nbilVe ts gtvcn b)'11

hic.

h oneof

thel i > l l o ~ >ing7a. 111 1 R C )b siK /( I+.< RC)c. sRC/( 1-sRC)d . l+sRC

The ins trumeututiou aulpliCiers arc usedpnncrpall y to amplify srgnul!i lrom 1vhkhof h ~ followmg'!a. Tronsduccrn

b. ActiVe fillorsc. Choppersd DIA conwrtersWhich of the tollowmg pnmnry delet'tortYflC' tmnsducers are employed I'Mdisplacement measurementl f'herm1$tor2 diaphragmJ . Thermocoup le4 Pivo t Torque

Sela:l t h ~c(liTeCl UIIS\H:.r usiog the cud"given belown. 1 and 2b 2 n d ~

c 3and4d I a n d ~

Match l tsH w1th l rs t- IJ und s.:lect thecorrect ans11cr t1smg the code gtYcn helowthe lfSISList-l

A , Variable capacnancc dev1ceB. Onfioe meterC. T h e r m i ~ t o r s

List-11

I Flow M e a .~ u r e 1 1H. : m2 Temperature measurement3 . Pressure . tnUlsdl.tccr

4. force nnd torque measurementCode


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n AJ , BI , C2b. A2 . B4, C3c.. 112. BL CJd AJ , Fl4, C1Which d isrl nce ment tnlnsduce r is s ~ dtorn cc u rale nnd liuca r n H!asurerHCH I'!

aLVDT

b. S1 n 110 gu ugcc. Pmcmiomcterd Capacitive disp laoemem tmnsducerWhic h ampl iJier is used in an clcdronion mlt ime le r?

a Po"er umplffierb. Outler amplifierc. D i i T ~ r ~ n l i al ump lifierd. Widcb ru td runplilicr

I'or low r c s a s ~ a nc c ( from lew micro oh msto one ohm) measureme nt, which bridge isu ~ c l?

n. Whllln:;tone bridgeb. Kelvin bndgc.c. Guarded Whe:ustonc b r id ~

d. M a ~ w e l lbridgeWhich bridge IS used to detemunefrequency?n. Andor.;on bridge

b. De Souty bridgec. Wien bridged. Campbell bridgeT h ~ dielectric l o ~ sof a t'


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106.

I07 .

h.

1008.

WIJ

11 u( JIt the volwge V across I0 nresistance is 10 V. what is the voltage ~ o fthe voltage source In the circ uit shownabove?a. -50 Vb. -10 vc. 10 vd. - 50 v

'"..

~ n..

L__L____1In 1he circuit shown above. w hat i ~ thevalue ohhe curre m I?a. JA

b. 2Ac. 3Ad. 4 AWhy is the co re of the transfor mer buill upoflam ination"a. To reduce eddy c urrent lossh. For convenience of fabricationc. No specillc adva ntaged. For increasi ng the permeubil lry

110 Matcrtal s which Jack perma nent magneticdipoles arc known as:

I l l

a . Pammagneticb. O i a m u g n ~t i cc. Fen-omag neticd. Fen-imagnctic.Match List -1 with List-n and se lect theco rrec t answer usi ng lhc code give-n belowthe lists:List-1(Mater ial)

A. Silicon steelB. Fcn-itesC. A lnict>

Lis" II (App lication)I. High freque ncy transfor mers2. P e- m tan cot ma gne- ts

3. Current rransfo m1ers4. Power transfonncrsCode:


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A B cn, 2 ~

b. 4 J 2c. 3 ~d. 4 I l

I ll Which one olyMomic go$ i> proportioMI w

temperature rh liT

c. . .,d. indupondenl ofT

113 Tn the case of n dielectric. subjeWlctom)Fermi level in n ptypo emicondu.:.tor liec.lose to which nne ofthe following?o, ' r he top of ho valence bond11, Ute bottom of th vnlettee bnudc. The top of the oonductiou bnndcl 'flte bottom of tbcwnducti on bond

116 Cons idef' lhe followi .ng statements about

.sctmicondu ctors?The forbidden energy gop InS\lmiconductors lid."' b13tW""-1l tlu:valence band and conduction band.

2. 'fltc forbidden cncf!'Y gap mgen nn ium al 0 K i nhQnl 0.72 cV ,

3. Se mi co nd uctors ha ve m : g n t l n ~lempeulure Q e f f i ~ c n lo f re si..'* tivi ty.

Which of the .stnemenlsgiven tooo\'e nrccorrect '/

13 of 1 ~

I . 2u nd 3b. I and 2o n l}c. 2 and :; onl yd. lnd 3 only

11 7 Which on e of the lbllowmg is U>e correc tst:11ement ?

When a p-11 juncrivn i$ revcrse-bias

IES Electrical Engineering Paper 1 2008

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Transcript of IES Electrical Engineering Paper 1 2008