RECRUITMENT QUESTIONS

OF

BANGLADESH POWER DEVELOPMENT BOARD (BPDB)

FOR THE POSITION OF

ASSISTANT ENGINEERS

INDEX

BPDB- 2011 --------------- 02

BPDB- 2004 --------------- 04

BPDB- 1999 --------------- 06

BPDB- 1998 (SET A) ------------ 08

BPDB- 1998 (SET B) ------------ 10

BPDB- 1996 --------------- 12

COLLECTED BY:

Rony Parvej

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Bangladesh Power Development BoardR

e) What is pcr'centage reactancc of a Dolver sysrem? Sho$-r h J ' h c o \ , K V \ r , t n . K \ r C I t - - , . . o , ji .d, r \ hJr . . I nf cd(n. c : ,ppu,. a . '

" , . f - , . " t . , isrur,oeX oh and reaclance Y ohm, ficn ivhar should be theI'npedence of that syslem:) l-'2b) From the lbllowing diagram answef lhe question 2+2, n1?sure thc currenl i^D, ii) measure the voltage Vr^.c) Suppose six barlefies are conneclcd in thc ib owingway. hdividual ballery rating is 12 vott, t00AH (amtr.hour). Considcr the uppcr series battery bank is ..A.. andthe ]o$,cr serics batrery bank is "8" 2+2i) Wlar is ihc total volrage ofb:rttery bank A?1i) \\,liat is the voltage & currenr mting ofiults]strlrljd) Define: Load tactor, Planrfacror. --4*" 2+2

J ' W r , e r , - . r a l r r p o | | n J r D l e o l . n c - c ) \ t ( . r - . Jb) Make a comparison berq,een 3,pha\c inou.uon andsysnchrounous molors. t9l lc) Discuss the causes ofralio en.or and phase angie erfof ofa currenl lmnsfbnncf. 4d) Calculatc dre monrhl) bi t l of a Lranstor]ncf \ \hoscmaximum demand is i00KW ond load iacror 10%. The1ari f f used rs Ik : l i , per KW and Tk. t .5 per Kw]ro o n s u m p t r o n . , , 1 r . l r (

Bangladesh Power Development BoardRecruimentExaminaljon fbtAssisilnt Engineefs-1999

f1=\ EI crRlcAL LNGIN EER ING\ , : . 7 T n e r 1 . 3 0 h o u a M J r L " 1 0 0ri i* . . ,nf i* que"r ion' in Lrg 'h rQuesrron \u | 'compursofyl] a) Write in short,Janluna MultrplLrposeofBangladesh.

.!nd remedics !f l-ow voltagc5

c) Recenlly Bangladesh has bccomecharnpion in a Ibolball

(i) Whal is the nirne ofthc tournamenl? 2(ii) When rnd \\here the toumanrenl was Played? 3

d) Recently mcmberuhjp of Pakisian has becn suspcnded

the implications of BangabandhuBridge over the econonical aspects

5

@ b) Nlenhon tlrc reasolsprobiem in polver sectoi'

bv an lnlenatronal Organization'1i) what is the name olttre Organizaiion? [olc](ii) \\rhy lhe menbership was suspended?. r , , ' ' i t - , . r g g e s l i o n . h o t B P I J B c a ' r m o r n \ (eftiolency and thereby render betler service 1o

1

ils

52. a) Nam. of.lhe dillorent conponents ol compurerHardNale wilh their functions.

' 5b) ^!ame sone of fie computer

'sollwares and descfibes

u.e. ofcn) three oi henc) wha! is meant by E mail. Intemel' LAN, WAli Systenrsused in Computer nct$ork slr'stem 53. a) Explain percenlage impedance and Vector gfoup ofoo*er lftnsibrmers. ?Jt) Dcscribe narallel opcl]rtion ot transfoflners slatin-q thecondilions. 14. a) Describe SF6 cifcuii breaker' 1

S b) Oraw a 2l0KV two bus-bar syste showing thc- lnt , . \ \ ,ne._

(i) Two generators (l50MW) each connecled throughI 5.75/23oKV fansformers(ii) 4 oui going hres (iii) hvo 230/l32KV hansformcrs(iv) Bus PT'S (v) CT'S (vi) lsolators5. a) Why e.T and P T are Lrsed? 2bl Whxl Co you nrean by the knee poinl loliage ofa C T? 2c) Draw the vector diagnm ofa C T + Phase dia + P T 9

d) Whal \\'ould happen. il \oLt li::: r;:. :,rr .:"i -:i ":

. . r d c d r . l \ p l .6.a) S1a1e $,od{rng prnrcipLcs ol an 'l.ilem.ri!i. irenlronrr:rls majol corllponenls,b) Stalc ihe condi l ions ol synchronizal i rn E\ ir ia in rh'm!,aning ol s.vnchronjsiong 01'en Ahemaror $lih rire 'i!: :7. Wdte shol1 rots\ on any 1lrcc ofthe lbilo\\'ing l:(a) Y2K problern (b) SCADA Svsiem (c) Drr:c!'onaloler-currcrl relny. (dl RcveISe Power Relav (e)

Bangladesh Power Devclopment BoardRccruitnent Exominatioir for Assislan! Engjneer-1998

Elcclricai EnginccringSetA

Time: 2:10 hou.s, Ful l Marl(s: 100Arswcr any six qucstrors (Queslicn iro.l is compulsory)l.(r) Dcscribc ibc economicdl and social aslreclr oftsangladesh Bridge. 5(b) lvlention the feason and rclr1edies olsysien loss inpo\\'ef seclof. 5(c) ln the last world cup Fooi Ball: 5Who ger the golden b0ol'lliarne the stadium whfe ihe ilnal gane was plaled?\\'ho was the rEf-erec in ihe finalnatch?(d) Name the localion , coLrntry and date of recentNuclear explosions. Nlention world bodies re-action.5

6?1ei CN,e ]ouf assessment on lhe pfivate N\\,er generalionr.ii.\ now undcr i]llplcncntation in Bangladcsh 5

2. (aj Discuss differeni Foteclion pro! idrd in *!egcnerator agajnsl various abnormal condiliofls. 9(b) What are primary and back-up prorectiofl: \l) ivii,up prolection is no1 good subslitutE for better rnainr.='!anc-.

3. (a) whal is sequence nelwo.k? Discuss ail three qpei;fsequence nelrorks? 9(b) A thre phase transmission lin operating at l0 Kv andhaving a resjstance ol l ohm and reactance of4 ohc66 isconnected to the generating station bus-bars though a5MVA step-up transfbrmer having a reactance of5%, Thebus-bars are supplied by a l0 MVA generator having 10.,areactance. Calculale the short ckt KVA to symmericalfault bet\\'een phlses in it occurs. . 6j) allhe load end oltransmjssion lineii) at the high voltage tcminal olthe transfonner.4. (a) Make a comparison between 3-phase inductjon and.\ nchfonou\ molors i(b) Discuss selfstarting of l-phase molors. 5(c) A 440V,3 plDsc,4-pole, 50H2,37.3Kw' Yconnectedinduclion motor has lhe lbllowing paramelers. R1=0.1ohm, Xr=0.4 obn, R:=0.15 ohm,Xr=0.44 ohn. The mororhas stator core loss of 1250w and rotatiooal loss of1000W. 11 draws a no load line curenl of 20W ala p.fof0.09 (lag). When notor operates at a slip of3tr, calculare-i) inpul line currenl and p.f. ) Flec ^ magrer. . r^rquc de\ciopeJ r l N.M| \ | ,u.p' f l and e fcrrncy afmoror5. Write short notes on any three olthe followingr 15a) Buchhi lT realy b) in\trument transfo.m(lc) Brushless excilalions system d) Push-pull arnplifiel'e) D.C tHnsmission6. a) Discuss 516 circuit Breaker 8b) Draw a 230KV n\-o:bLls bas system showing the 0iollowingi) Two generators (l50Mw) each connected throug! one1 5.75l230KV transfonnerii) 4 out golng linesiii) Two 230/132KV lransibrmersiv) Bus PT'sv) CT's 17. a) Explain the basic pfinciplJ oftap changlng ofruir i l i rm

' Bangladsh Power Development Boardj { 'u i r l .cn. r r rminxt .Jn 'uf . \ i i i r rdn Fneineea lcoq

/ . , . : \ set 'B\

c) Bangladesh will lake part in a World Cup competition jn

(i) whal is the name ofthe game? 2(ii) whcn and \r'here lhe game will be played? 3

C) USA and some olher countries and agencres haveimposed sanetalions on India & Pakistan dlLe to Nuclearexplosion. Describe its impact on Bangladesh? 5c) Give your assesment on the ptivate Power generaiionpolicy nolv under implemnlalion in Bangladesh. 52. a) Slate working principles of an Alternatof.Mentioning its major components. 5b) Make comparision amoung Squirel Cage DC & Slipringmoton giving at least one application lbr each. 5c) Slaie the conditi{rn of sysnchronization. Explain themcaning of synchronizing ofan altemaror with bus. 5J a) Explain percentage impodance and Vector Aroup oipo\4er lransformefs. 4b) Describe paraliel operation of iransfomers 'staiing ihecondirors.c) Illushale any three ofthe lbllowing rransfornef: 6

i) hstrument ii) Aulo iii) Distribulionr \ | \ . 4 r r ( n r n g \ , U r o u n d r n g .

4. a) N.rne thc larious typcs olcircuil b&aker' 4b) Dcscribe load-acid and r\"ickel-cadmiurn batteries andbafter y charying system. 6c) Describe how a power line caffier communication worksand whal arc ils essenlial conrponenls. 5j.6) Wha! are difibrenccs betqeen a cunent transibrnerand poteDlialtl?nsl'onneri 5b) Draw phase diagram of a potential iranslbmer andriiscuss thc casues ofralio enor & phasc angle rror' l06a) Siale ]e beneilts which are divided frorn tlrcappiicrlion oi shrrn! capacilor on the lord end ol a circuits pplyirlg 3 ioad Dflagging Power thclor' 9b) Dralv :r conpafision between shunl capaciior ands.rnchronous condenson in respec! oflheit applicrniions rnpower sls!,fl. 67. Witc shoft notes on any three ofthe follow'ng:- 15

(b) Directional o\er cunent relay.(a) Transducer(c) Lighling an$tor. (d) Revfse Power Relr,(e) Gas iu.bine powcr Plant. . ,

Bangladesh Power Development BoardRecruilment Examinalion for Assistant Enginecr_1996

Elecldcal Engineering- Tinei 2:30 hours, Full Marks: 100

Answer any six questions (Question no.8 js compulsory)l.(a) Make a compafison bciween sytrchronous andinduction motor!. i0(b) Enumr:rare end explajn at least t1!o applications ofasvnchronous molof 52. (a) \1hat are tha disadvantages o I lo* po*er ihctof andwhat arc the wa]'sto correct it. 1(b) A f'aclory lakcs ihc following balancd load fioln a440Y, 3{hase, 50 HZ suppiyii) a lighting load of2oKw0./ a Jo' l t inLoL.s Inolor lodJ. l joKVA a'0 5 Pf lugp'ngCalculate the KVA rattng ollh apacitor bankrequlfed loiniprove lbe power I-actot ofloads (a) and (b) togelhr tounhy. \lilat is the new ovemll Pl ifafier correcllon iasbeen applied; the welding load ls switched on ii

,r. (a) f,hat are the dilIi,fc.l bclwecn a cunent transfonnerJ d : T o r i l r ' . r ^ r ( '(b) Drns phasor diagran ofa potential tnnsl'onn.:r anddiscuss thc causes olratio error and phasc angle crror. l0.1.(3) E\! la in dre i r in. iple ofopemtion oid lhrcc phascpo*cr lfunsiorrner. 3lb) Assrming rhai rlvo rranslbnner having unequal raliosol ir?niloFnxtio. a.e conlrected is paralleled,-indicalc ln)wihe 1or:l load di\ ides ber$een lhem. 4t!) \\}3! should be the KVA rating ofeach lfanslbFncr is! \'-\ ba|rl.i Nhen ths Lh!cc phdsc balanced, loa.i is 4{JI\\ \l If a thifd sinilaf lfanslbnncr is connected folrir:r'!lion in delta-deha. what is th mted.apacit) ? Wtatp.rcenrrge incfease is ratnrg is efiected in this way? 8,