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Bangladesh Pou er Der eiopmenr Board;Sdru, lmenr t \J 'nin io- tor cr. :5, ;nr Fngrr(ea rur,1

(t i$_. ^ _- _Frcrr icat Ensinecrin!t : / r 'me: LJo "our5 \ ta"ks:t00Ans*er th€ lbllowing queslions in Engtishi

l.a) Wfite down the nane and p-opulation of rhe SAARCcountriesb Ho!. l \c l r i f ic jarn n' Dhal,a cr.1 car. b. . , rs6 "

5

\4enr 'orc ) our iLgg(. l ionc) Write short note on (any tr,r'o) 5\ r(s . inr iet . Lo:d .eedrng. (rr<cn hou.e cJle.. l .d l \Vrre dosn rh( ,r , .1 r) .e.nrnS o, the t .J. l^{ i l jaDbre\rlattons 5OPEC, CNC, SALT. UNICEF, NASA,[OPl (^.Ordani. ,at ;r oI /crrot iLn F. lua ne ( oLntr.( . ,(

. \u ( ornp-er. \ - l . r ral Gr. . s \L l . \ t r . .e! ;c ATs

Lrnitation Talksr UNICEF=Unjted Nations InlemationalChildren's Emergency Fund, NASA-Narionat Aeronauiics

i - I + fb) From the_lbllowing diagranr answer !h€ question 2_2lJ measure the curRnt I^D. ii) measurc thc vollage Vr,^.

d) Detin€r t.oad factor, ptant tacror. -4i1"" : . " ' ^ : * " ' f 4 \ n

) 2a, wnre i ,p<." r rng p j .nr rp,e ̂ l L-crr ) l \ le e, j

: '": '?:r. r ' fduJrie, !..c co-r.c.ec , ,r,e ro,,o$insl f ] j

, ,n l , l , i " r b . ( , . r \ . in ! i . J t ,u t r . touAH r rm;nouf) | .nrrde- the .pnrr .e ( . oa,tsD bdnt r . . 'A..and

j) Wh.r l rs thc rorJl r^ i tuee ui hr l rer! b.nk {1' ' I ! \ l a t ' l l ( ! o r . ' g e & L r | r e n t m t i n r o ' t i r l l , ) j , e . n . .

and Space Adminstration.l

b) Draw a fult wave brjdge reditier? 5

e) Nnne ofrhc capital ofthe following coLrnrries. 5\ ,1) Jarra.. I abrnun. pc-1udJJ. Mofocco, AU,rr ia.

l \ ' ld\a.m.rYan!urre. l dbJnor-Bajr i l . lo. lug,r l_t : ,oor,Moroeco=Rabnr. Ausrr ia=BieanJ. l: . . , \ h . r l i . l l < d : t l e r e n c e t s e c : I \ e r l J d r ( c l . t e - . . l

b) Nlake a comparison terween j:p'hase intluction an'dSysncllrounousmotors. {s}L , b . " c - s . t r e . a r F e : o . r r r i o c r ^ . a n d D n a . . J n g i . . c - f o f o fa cuncnt t tanstufm(ral c"r.ri"i. il'" ***iy bil 01 a r.ru"ronner uuno"a.maxrmunr demand is l00KW ard toad fhcror = 40% Ih.tar i f f uscd as tk j5t per KW and.fk. 1.5 per KWtrconsumplior. r ̂ r r - : l r ( 5

(t, c) Meition a device, whjch rrorks borb as rectrfjer andi,n, , : --rer I ] r !$ rhc_, lo(^ oirgrdrn ot rr . *ork n., pr incrple.,+dl $ hJr i . JnJrt . t ier. ' !an

" rr :nsi .rm.r r . . u. id a, ,ut cg"or curent amplificr? Justify your ansrvcr. 4

_r J WhJt r . Lnc n: i r 'heory o, opc,rUor oi . r , r , .n--cr :/ l - )

l . I DC rr ]n\ tonner Dn(s.bJe, ! j . \e r id.nnr .or )o. . f

" \A : , ; ; ; , r : - . ro ' re ,m,ns i , , \ ruJ :nK\A , j,J, ! h. l l ar. . rh( corroiJron. ot prrdt l ( l .Derat ur, u.

.,.rr drrnnsfomers?

ro.rl,i l' i :)-1 single phase transfonner lus 400 primary arms and

v r o a : r ' H 7 . s . e r r d n d r t r l i p e r . . d t u e i t r u \ J c r r . i r ) r rrhe core 0 976wbrrr- anC considering the cross sectionala r c a o i r l ' e c o r e L o 4 i r n : , h < , i n d o u L _: h du((d , J lrdr( i - r t e pr i nJD er(.ii) Induced vokage in the secondary *,indings. 2+J

a / . r , , \ \ h a t r j c , n . o i , l ( r e n L e b e \ v . . ( n . \ . i r c l , i . o t ] l ^ r r n (

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{fiR: loodr'l-T, rFr_co

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b) Name four types of circuit breakers useo rn powcl

C) Rr4t qfi liTs?gil firgiift Eeft3]Tqlr*lg <{r qs I slT ts FJI<E Fta$ T(i? ?i?fi'$ El-j € sr{{ li Elrq {rT{e en?ola s F riary lill a F 1tr6] +ti1qd.{ \r+e+a=)b1 F) Kifchhoffs tau, Rfu Ffl!'

1F* tu 1j " e< *v+m"1Tqo <&d"i qnl A err rD

c) l )ra\ , a sch€matic diagram ofa 132/3jKV. rr . . t r ' ton r l rr in i : t$, , in.un r t -g. tbLrIeeo(t and a hus coupirr .

2double bus

outgoirlg.s R{K eRlq Frf{ {+i r

& dl u]lat do you mean by fault MVA?

"t^E{ {{ilrFl ; ba

'{1!:3) .) 14ff1i{i: cx)=c

tal LDc (b) OIC (c) EC (d) BARD (lr) SAARC1) ff{6RE crd rTcn &t< ffi fr,{rs cx!=cT) {.!v q) slq .l) sit']l'i s) lffiffi s) Trflsl

I 'lransiale into Englishr )o

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'l) 3-phase 4-wire qi\ 3-phase 3-wire Energy mercr rdqnr!]q€q E{? <fu lt €r{d fibtqr c(q1.1fu 1g.{ElI< q({{ Ffil

8 lT) Systen Engineering € EquiFment Earlhing. q<sz{ffirvl1+?q) Effi-n qr .€i'fi qffi ctt rfi qi".frqr{ R1{{, qsffFt $dT{fttir c'f) ,!+G fie\ b'tc{rs tll.4kv, &-iaq 500KVA 50HzTransforme( qn Fls'l'f q.s crrF 1000 AMP rhee phasc Airckt B reaker qFtFl \4lcq8i) fi1qFirt Tr '$ c{ls ci!6 qi{ qEF rRre rtridd ffiq"i1ift*r+r*ii) LT ctF 80% (rz<b) q]lFl{F cql6r qar 4ffi qslrq $s'Amp Setting effil?

a I F{l fftt (c{ cElT eDe-Auto Transfbrmer, Power l.aclorlnpedancc. Skin Effect. Marslraling box.

q1aq56r7.1 ftaq B'4r* c<n6_j"1-€i'-A eld.e (s&Rr fimE t?*1-locotr

(.p ) l.+la I ob o. frs . 1ftns )oo\---l €Fl-A , Il-{-tc

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c) XLPE Ttlic61r mBr ft? nt{tla-r F Rq @tn 1- 6 *r@

l.a) Wriie in short,Jamuna MultiPu4roscofBangladesh.

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ft fr iifq{ q-q.i Tia slr{? c

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{) vedical c{tr{ cd{lT rl{{s' q{ 4R:lJ{l{]!! Fq 4rql 'i

{ar qIF? td) Etcwti? Flwirgni birr sR fift{l cw4 6{F|1.{ q]ra?

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Bangladesh Power Development Boardliecruiimenl Exalnilration lbr Assislant Engineerc-I 999

.\ EI CTRiCAL ENI J IN EERINC\ - , , . / T r m e l . l 0 h o u r s N I a r k \ 1 0 0

" '" .*-- . ' ,n1 . i^ . t ! .es inn. .n Ine'r 'h rQue'r o N i ,

the implications of BangabandhuBridge over the economrcal aspecls

c) Reoenlly B.rngladesh has becomcchampion in a lbolball

(i) \\hnl is the nanc ofthe toumamenl? ?

(ii) When and rhere the tournamcnt was Played? 3

d) Recenlly membership of Pakistan has been suspendcd

by an htenational Organrzalron'1i)\\hat is lhe nane olthe OrganiTaiion? [OlC](ii) \\hy the nrembership ras suspended? 3

i&e) Cive your suggestion, how BPDB can improvc its" eiiciency and thereb) render bettef se lce lo lts

conrLrr<r. :

2. a) Nane of.thc differ€nl componcnts ol conputef

Hardlvare \!ilh their iunclions. 5

b) Nanc somc of the computer soli$ares and descrrbes

uscs ofany threc ofthem 5

c) Wha! is meant by E-mai]. Inteme!. LAN, WAN Svstcrns

|Lsed in Compulcr netwo* system 5

3. aj Explain percentagc inpedance and Vcctor grolLp of

Do\ter Imnsibmers. ll

L) Describe parallcl operalion of transfonners staling the

@ b) Meniion the reasons andproblen ln Power secror.

.4. a) Describe S!6 circuil breakef

O b) Draw a 2i0KV two bus lrar- tbl lo" ingr-

' 5

rcmedies of Low voltage5

systen showing the

(i) fwo generalors (l5oMw) each1 5.75/230KV tmnslbnners.( i i ) 4 clr t going l incs ( i i i ) t \ \o 230i l32KV iran\ lornrers

l iv) Bus PT'S (1) CT S (\ i ) Isolalors5. a) Why C.T and P.T are used?b) What ,lo )ou meai by the hee ponrt loliage ofa C TI 2

c) Draw lhe veclor diagram 01 a C.T - Phase dia - P T 9

d) What $'ollld happen.a loaded C.T? Explarn6.a) State working Principiesits majof conponents.

if you keep open thc secondar! oi

of an Ahemator tuentronrng

b) Stxlc the conditions of synchronization. Erplain $e

meanlng ofslnchronisiong 01 :n Allemarcr \aith the bus 8

7. Write sho( notes on any thrce ofthc follo\\'ingr- l5(a) Y2K problem (b) SCADA Svstcn (c) Di.ectionalovcr'curcni relay. (d) ReveNc Po$'er Relay (e)

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Bangladesh Power Development BoardRccruitment Exominarioir lbr Assistan! Engineer- I 99 8

Electrioal Engineef ingS€r-A

Timc: 2130 hours, Full Marks: 100Ans$'er any six llucstions (Question no.l is compulsory)l.(r) Descdbe fi€ economical and socialaspects ofBangladesh Bridge. 5(b) M€ntion the rcason and remedies olsysten loss in

(c) In the last world cup Fool Ball:Who get the golden boot?Narne the sladium where !!c llnalgame was pla-ved?Who-ras the referee in tlre l'inal malcb?(d) Name the location , country and date of receniNuclear explosions. Mention world bodies re-action.5

A f<) Ci i e \our a5\e i .me_ o- rhe n r ' nr i Taucr g( , . ra l ronp \ . c) r os L j rder rmplenrenrar ia- ; . Banpladesh. 5

55

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2. (a) Discuss diferent protection provided in thegenerator Against varjoub abnonnal conditions. 9,h, \ har i ren-:rrdryano 1.1(,--p prcrecrrunl l \ r . ) \"c l ' -. r f pro.ec.ron i . not g.od subst i iure lof berrer n a,- ,enar.c.

, 53. (a) Wlai is scquence net$,ork? Discuss alllhree lypes ofsequence nets,orks? 9(b) A three phase transmission line operating at l0 KV andhaving a resistance of 1 ohm and reactanc€ of4 ohoms isconnecled to the generating station bus:bars though a5MVA step-up translornrer having a reactance of5%. Thebus-bars are supplied by a l0 MVA generalor having i0%rcactance. Calculate the shot ckt KVA to symmericallaull between phases in it oscurs. . 6j l r , l f ( lodd cnd ofran.missirn l inei , dr r .c hrch r .kage rcrm;nr l dl ihe rrdnsiorrrer.4. (a) Make a comparison betwcen 3-phase inductron andsl/nchrono!6 moters, : 5(hJ D'sc,r .s.elr s laning of I .ph$c molors 5(c) A 440V, 3 phase, 4-pole, 50H2, 37.3KW Yconnectedinduction motor has the folloving paraniete$. Rj=0.1ohm. Xr=0.4 ohm, R?=0.15 ohm,Xr-0.44 ohn. The molorhas stator core loss of 1250W and rotatio4al loss of1000W. lt draws a no load line curent of 20W ala p.fof0.09 (lag). When motor operates at a slip of3u, calculatc-i ) lnor l l inc c-n(nl and p. 'i i j Fleclro rragneric rorqu( Jereioped in N-VIii) OutpuL and cl'ficiency ofrnotor 55. Wite shol1 notes on any three ofthe following: l5a) Buchhelz realy b) instrument imnslornrerc) Brushless excitalions systen d) Push-pull ampliiere) D.C transmission6. a) Discuss SF6 circuit Breaker 8b) Diaw a 230KV two:bus bas syslem showing fie 0lbllowingi) Two generato$ (l50MW) each connected ftrough oneI 5.?5/230KV transfo.merii) 4 our going linesiii) Two 230./132KV transformersiv) Bus P-r'sv l C l c

7. a) Expiain the basic principle oftap changing oiatransfonner. 7b D(r f ioe lhL lo \scq occu, in . r l rJn. lomef dnd \o\ h<)can be mcasurcd, . 4c) Dcrive the felation betlveen the losses lbr whichmaximum ellicicncy is obtained by a transfbn]rer. 4

Bangladcsh Power Development Boardj r41"iLn cnr Eramrncl ion rbr Asr is lan' Lnprnce-<- loqq

tr#4& set'B'q&JY EI-CTRICALENCINELRINGTimei 2.30 hoursAlsrver any six queslions incompulsory)

I.a) Describe the economicalfl"ct Peane Trealy.b) Menrion the reasoN andprobleil in power seclor.

Marks:100EngUsh (Question no. I is

aspect of Chitagong Hili5

remedies ol Low voltage5

c€ .t|n-(o6. .1[?-oi./\,1, 9

(i) What is the nam€ ofthe game?(ii) *ften and where the gane will be played? 3

d) USA and some other countries and agencies haveiiiiJoscd saneiations on lndia & Pakjslan due to Nucleare\plosion. Describe its inpaci on Bangladesh? 5(r Cr\ y^u" r \se\rrenl on lh( o.r \ar< Poser

'eenerar inn

policy now under implenenbrion in Bangladesh- _

52. a) State $orking principles of an Altemator.Mentionjng ils major componenrs. 5b) Makc comparision amoung Squirel Cage DC & Slipringmotom giving a! leasl one application for each. 5c) State the coDdilion ol sysnchronizalion. Explain themeanirg ofsynchronizing 01'an altemator with buq. 5l. !) lxplain percentage impcdance and Vector group ofpo\ler lransformers. Ib) Descdbe prrallel opcration of transfonners stating theconuir .u 's. ic) Ilhrsirate any threc ol the foliowlng transforner: 6

i) lnstunenl ij) Auto iii) Dist butioni l r a t , : h i _ g \ l G r o , r n d i r b .

4. a) Name thc va ous types ofclrcuir breaker. 1b) Describe lead-acid and Nickel-cadmium balleries andballefy chargiDg system. 6c) Describe ho{, a power line carri€r communica!]on worksand \vhat arc its essential components. 55.a) Whar arc diflerences between a curenl ransloffnerand polenrial tnnstomier. 5b) Dra$ phase diagrari of a potential transibmer andrliscuss the casues ofratjo eror & phase angle onor. 106.!l stale lhe benefils wbicl are divided fiom lhedpplicnlion ol shunt capacitor on the load end of a cifcuils|pplying r load oflaggimg fower f:c!or. 9b) DraN a compa sion bel$'een shunt capacitor anclsynchronous condensor in respecl of{heir af,plicantions inprr !\'er syslcrn 6i. Writ. shoft noter on any thrcc olthi Jblkrwing:- i5

c) Bangladcsh will take part in a World Cup compeiition in

(r) Tiansduce. (b) Directional o\ei cunent relay.

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lt€qs ASEAN=Associalion of South"Easi Asilrn Nalions,AIDS=Acquard Inimune l)cflciencv Syndrome, GAIT=cenerai Agrean.nl on Tiaifs & fl?de, CDVI= ,EASF=. SOE=Srate of thc CloLJal Dnvirorrment , NAM= NonAiigned Mor,rment, FIFA= Federalion ot lniemationalFoorhall Association. l-i]JHCR:linired Nations HighComlrission tor Refugees, IPSA- Insritute oL PoslcraduaF Studies oD Ag.icullurc I

Bangladesh Power Development Boatd

ElectricalEngineedng' Timci2r l0horm. Ful l Marksr 100

Ans\\'er anysix queslbns (Question no.8 js oompulsoty)l.(a) Make a conparison betlveen synchro'lous andindliction motors. i0(b) Enumeratr 3nd explain at lelist lwo applicaiions ofa

" . . h-ono-. n! ' r , !2. (a) \l,hat rre the disadvanhges oflot! pouer lactor and$hat are the way._io correct it. 1(b) A faclory takes the following balanc.d ioad liom a,+40V.:l-phase, 50 HZ supply;i) a lighiing load oi 20Kwii) a continuous motor load of:0KVA al0.5 Pflaggin€iCalculate the KVA rating ofthe capacilor bank requrred ,ojmprcve the powcr fac{or oikrads (n) aud {b) bgelhc. tounity. What is lhe new overali PJ i1 a1ler coffechon hasbeen applied;the $,elding load is switched on. E

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3. (lr) \lhar are the ditlerenL betwccn a curent lransfonnefand a polcntial tmnsformer? 5(b) Draw phasof.diagram ola potential lransfbmrer anddiscuss lhc causes of ratio eror dnd phase angle enor. l0.4.(a) Explain thc drinciple ofoperation ofa thrce ph:isepower imnslbnncr l(b) Assrming rhat two lfaisfoflner having uneqlralratiosol lranslomation are conneclcd is parallel€d, jndicate howlhc total load dilidcs bctween !hem. 4(c) what should bc the KVA rating ofeach transtbmrer rsa V-V bank when the three phase balanccd, load is 40KVA? Ifa thi.d similar transfonncr is connected foropcratlon in della-della, whal is the rated capacity? \lluiplrc€nlage increase is l?ling is effected in this \\ayl 85. (a) Give a b efdescf ipt ion di f terentkjnd olgenerat ionin BPDB syslem l 0(b) What is dcnrand side ofmanagerncnt.hoi! can \\,e reducegen€.arion shortlall by adopting such manage enll j

6. Write short nole on any lhree oflh€ fbllqwingia) Transmission line protectionb) Reverse power fcl3yc) SF6 circuit broakerd) Gas Turbine Powcr Plarle) Ripple factor respecl o{ reclifier output.7. {aiitate the bcncfils which are derived ftom thcapplication ol shunr capacilor on the load cnd ol a aircuilsupplying a load oflagging Fower fecior.

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(b) Dr€N a comparlson behve€n shunt capacitor andsynchronous condenser in fespec! oftheil apllicalionoower system. 68.(a) U/ri1e short assay olr ''pd\aie sector paLlicipalion inpowcr generation in Bangladcsh '. 5(b) tr&al afc cnuses 01-systen Ioss in an electricity utililyJ . d h J \ . L u p r c e ' . , 1(c) Write short note on 'Jamuna mullipurpose BndgeProject" 5(d) i) What do )oumean by 'soft*aro and " l lafdi 'are" ina co-nr-rrr .ii) what js " Bio GaJ'? \\'ha! are ils ronstiluenls? 5(e) \'hal h "galax),"? Statr-thc fclative position ofthc sun,the €arth and the moon is galll\y and lheir motion. 5

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1. Which is the lightest particle ofan atom?(a) Neutron (b) Electroni (c) Proton (d)All

2. Ampere second could be the unit oi-(a) Powe. (b) Conductance (c) Energy (d) Chargel

3 l he ratio of lhe resistance of a 1 00w, 220V lamp to thalol a 100\\ lamp ui l lbe neaf l \ -(a) 4\i (b) 4 (c) 1/2 (d) r/a.4. Il the length and cross section ol a piece of conductorare both doubled x hat be ils resistance (initial rcslslance R)?(a) 4R 1/ (b) 2R (c) R (d) 0.25R.5. Tbe number of eleutron ir1 the outermost orbit of carbonaiom is-(a) 8 (b) 2 . (c) +{ (d) 6.6. which one ofthe following is semi-conductor?

(a) Copper (b) Siliconi (c) Neon (d) Lithum7. Wlich is fie highcsr system voltge'in Bangladcsh?(a) 33KV ACr(c) 230KV AC{

(b) l l2KV AC(d) 23oKV HV DC lilk.

8. For an R-L load(a) Active polver is greaier than apparcnt power.(b) Reactive power is greatef than apparenl po$er.(c) Appar€nr power is grcaler than both aclive and reaclive

(d) All the equal.a. One Hrf5r po$e- ; equdl Lu-(a) 5.50 Fool pound./Second (b) 55.00 Fooi pound/Second(c) 550 Foor pound /Second\i(d) 5500 Foot poundisecond.10. The radng of a iuse wire is always exprcssed in-(a) Anperes{ (b) Amperc'lolls (c) Krvh (d) Ampere-hours.li, whioh ol the lollowing is linear and bilateralpJrarrelef - 'J ' l -an5i .o_ /b) Resi\ror(c) Elecrron tubes (d) Semiconduclor diod as {12. Cells are connccled in parallel(a) To increase the inlcmal resrstance(b) To increase the vollage outpui(c) To inc.ease the efiiciency

rdr To.ncrease lh< (une- capa(i t r \ll. Satellite power requirement is provided through-(a) Lead-acid batteries (b) Dry cell

(b) Cooking Oil(d) Vegetable Oil.

(c) Solar Cells{ (d) Nickel Cadmium Cells.14. The energy is slored in a iead acid battery in ihe tbrm 1]1-(a) Electromagnetic Energy (b) Elecrostatic Energy(b) Chareed ions (d) Chemical Ene[gv \r15. A radio slation broadcasts at 30n wave lenglh Theiiequency ofbroadcast will be-( a r J 0 H / \ o l j 0 " H / , J 0 \ 4 H l \ r d ' 0 K H . ,16. A short oircuit test on fansformer'oil is(a) Copper loss ai lull loadl(b) Copper loss at halfload(c) lron loss at any load(d) SLLm ofiron losses & copper lossesI7.The type 01 oll $,hich is soilable as lrarsformer oil is-(a) Aninal oil(c) Mineral Oil I18. The function of transibmer oil in tnnsformer is-(a) To provide protection against lightlng.(or To f .o\ ide insulal ion and cool ing l,c, T,J p-orect ion agairsl snon-circtrr l ng(d) All ofthe above.19. Bucholz relay used on-a) At cooled transformer b) Oil cooled transfomerslc) w€lding transtormers d) Furnace transformers20. Burden of curent lransformer js usually expressed ln-

(a) Volrs b) Amperesi c)Voll anperes d) Kilowalt.2l Perm.s. ible \"r :ar ion i . po$e' l reoLrenc) i r

Bangladesh is-(a)r0.1% (b) 11%\i (c)t5% (d)110%

22. Which dlsiribulion syslen is lnor€ reliable?

r a r R i n g n a i - s l . e m J , h r f r e e ' ) ' r e n(c) Radial system (d) All are equally reliable23 Common declared distributjon voltage in Bangladesh

for low voltage cjrcuit Is_

E-{TqnIiI c{ nKc$6 'ntgilub 8

(a) 230 v! 6) 440 V (c) 2s0 v (d) 380 v24. The phenomena ol creeptng occurs 1n-

(b) Voltmeter(d) Watthour meters !

2 < l r e L n . r o l r < . i . r i ' i r ) ' s -

(a) Ohms (b) Ohmrn! (c) ohm/sqm (d) None

26. Three equal resislors ol 100c) is connect€d in series

across a source of E.nr'f 30V. \\ha! would be the power

r,nsur<d b) eacr re5rclor"fa) row! (b) 3ow (c) 9ow (d) 6owil. wnat ir lhe conditon lof maximun efficjency of a

(a) \\&en X-former runs with unity power factor'(b) Ullen copper loss=eddy currenl cullent loss(c) When copper loss-hysle sys loss(d) \\&en copper loss=hon lossll28.The copper loss of a transfonner at full load is 40W.

What would be al halfload"(a) 20w (b) 10w I (c) 40W29. What would be obarge ol a PF

It. ln a resonance conditlon-(a) x,.=xctr (b) z=x,. (c) z=xc

(d) 160w.when connect€d with

20V supply?(a) 200btc 0) 200i1C{ (c) 300!C (d) 30FC

30. Onc cubic water rs equal io-(a) 74.6U.S. Gallon (b) 628 Pound \r'ater

(c) 2S.375line ; (d) 28 3 Cubic neter' {

id) Z=R2.

!i. wr,iil pi,'*. factof is more economical lor th€

(a) 0.85 kgging(c) 0.95 Lagging

O) 0.95 Lagsrns''r(d) 0.85 Leadrng.

(b) KVAR/Sin,(d) None ofthe above l

: j. rrrhe.Jxi*"m uulue ofa cunent ofa circuit is I amp(sinusoidal nave), wlrat is ihe R M.S value?(a) lAmp (b) 0.70?Amp'/ (c) 0 637Amp (d) I 5Amp14. KVA is equal !o-(a) KVAR cos d(c) KVAR ian d35. Aclive powd ls equallo-(a) FZ (b) VI Sine{c) vl CosO ! (d) Nore ofthe above. ,16 Which is the used for po$er faclor improvement-

(b) Spring molor (b) Commutalot motor

, . , S u n . r l o n o . , t . o , o r J l d , s q u r r e l ' a s e r n o r o r .J7 i a po. I pha.e ;nd,cl ,on rrotor opera e' f iom a

supply whose frequency is 50 Llz wllal is the synchronous

.; ; ;"-p '" b) 200r 'rp ' ' cr 2500rpn d) l500rDm'/

J8. lhe 5]nchronoL' ,peed of " i - rdt l l r ion n'olor is 1500

RPM and slip is 0.04 What is rotof speed?

a)l500RPM b) 1800RPM c) l4',l0RPM{ d) i240RPM

:li what $ill be ouiput cunent of a 100:5 cuffent

iransformer when used in 50 amp line current?

r - r . : . 5 \ n p t b ) 5 A n ' p r c ' 1 o A m o { d \ 2 0 A m p

40. l-lo$ can edd) r:urrent loss be minimizedl(at B) Jr ing copper corc lb) B) using solrd co-e

\c) B\ l .m rar in! ' l r< coreJ rdJ \one ofrbo\e

41. Does the transformersecondary is open?

dra* an) curcnt \ahen its

(a) No (b)Yes{ (c) Take rated cunent (d) None42.\)!4lich one is the synchronous condenser-

far Elecrrol)r ic ( apacirol(b) A capacilor bank(c) The combjnation ofinductor & capacitor(d) An excjted synchronous motor' 'v

4j. tl'hich pheno-"ua i" fenanti efTect?(a) Wben receiving end voltageis greater

end voltage lthan sendjng

(b)(c)

The variation of frequencyWhen sending end voltage is equal to recervlng eno

vollage.(d) None ofthe above44. The sag produced in conductor of a transmission line

depenos on-(a) Weight ofthe conductor per uml voltage

fb) Tension in the conductor, . , i ""* f ,

" f ' f , " *"a*ror 1dr Al l ofrhe abore /

45 lot : l power generaLion capaLit) ol Baigladesh s

ln',*lt* rt ,0,, ,ooo tw (") aooo t'lw (a) zt oo uw!+i. e SOn, iltemator lYill run at the greatest possible

speed ll it is wound for-(a) 8 Pole (b) 6 Pole (c) 4 Pole.47. When speed of an Altemalor rs

Rpm to 1800 RPm, the generuted

(d) 2 Pole. vchanged ftom 3600enf per phase will

(a) One half (b) Twice{ (c) 4 times (d) One fourth

+d. rh" ."ge", (mega ohmeter) is exclusively desigred

for m€asuring_(a) very high resistancetr (b) Very low resrstance

(c) Ground fault in Pouer Iines(d) Overload oir D.C motor.49. The faclor ofan R_C circuit is_(a) Zero ! (b) Between Zero and L{

i"i I-^ (d) Beiween zero and (-) Lo

50. The power facrorofan AC circui t i \ g ivenb)-

L a ; t l c o . d v r b l V l s i n , l c ' F Z r d l t X

it. The phase angle ofa series R_L-C circuit is leading i1-

r r r X L - 0 \ b r R - 0 t t r X > X i r d r X \

ii. :r *r" po*.. factor of a cifcuit is unity' its reaciive

ia) A maximunr (b) Equal to FR(c) Zero{ (d) A neganv€ quantrtY'

ij. ti po"lllu" phase sequence of 3-O load is "abc" the

nesative sequence is-

rai oac rbt ctrr { f l acb rdr \ l l of lhe dl-o\e !

!+. rr," po,"". laken bv a 3-O load is given bv the

expression-(a) 3VLlrcoso &) !3vrlcosu l

( c ) S V r l ' s r n o ( d l ! 3 \ ' i l L s i n o ^55 I he drrecl ion oi induce e m crn be found b)-

(a) Lenz's lani (b) Fleming's Right hand rule

(b) Kirchoffs law (d) Ohm's law

6{CEifd c€ nr{6$6 fltg/v b@

56. When a 400 Hz trunsformef is opetaledKVA rating is-

(b) Stator & field(d) Rotor and Amaturc.

at 50tlz its

({) )\ |

(!) cb

(a) Reduced to.one length (b) increased by 8 times(c) Unaffecled! (d) Increased by 64 times.57. Wbich resistorwill.be physically lafger in srze-(a) l0o, i0W1 (b) t00o,t0w(c) lKO, lW (d) lMo,lw.5\ . fhe pf lmary pan\ o l .1-0 IndL,c l :or lTorof are-(a) ltotor & stator{ab) Slipring and brushes

(a) Plate Thiclness(c) Plate separarion

(b) Core loss{(d) Insulation resistance.

59. The frequency of voltage genemted by ab Aitemalofhaving 4-pole and rotarjng ar 1800 Rprn is-(a) 60 Hz\r (b) 7200H2 (c) t20Hz (d) 450H2.60 The starting winding of 1-d moror is placed h the-(a) Roror (b) Stalor (c) Armature! (d) Field.6l. One lr'atthour is equal to-a) 360 Joule b) 3000Joulc c) 300Joule d) 3600Joule.!62. Ihe main purpose ofperforming open circLrjt test in arrnsforme. is t o measuree its-(a) Copper Ioss(c) Total Loss63. A hnsformer has negative volrage rcgulaiion when itsload porver factor is-, . , , / e r o { b ) U n r n r . ) l e a o i n g . , J } L a E g i n g .6,l.The capacitance ofa capaciior is't influenteo Dy,

(b) PIate area(d) Nature of the declaration

65. Unit ofnagnetic flux is-(a) Anpere-lum (b) Waber (c) Couklmb (d) Farad.66. Pcmanent magnet is rnormally mrde oll-(a) Aluminiu'n(c) Cast Iron

(b) Wrought Iron(d) Alnico alloys.

,/

67.Which of the follolring materials has a negariveremparature co-elfi eient of rcsistance,(lr) Ampercirour (b) Coulomb (c)JoLrle (d) Newton.69. l ia 220V hcatef is user olr I l0V supply wha yould bethe heat p.oduced-(a) One half (b) Twice (c) One,fourrh (d) Four tines.70. Which one is used lbr constart streel Iighr load-(a) (lLrrren! x-t-ormer (b) Potenlial transforner(r) Power x-fonner (d) Conslanr currefi x-tbrrner. !'

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