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; S d r u , l m e n r t \ J ' n i n io- tor cr.:5,;nr Fngrr(ea rur,1 ( t i $ _ . ^ _ - _ F r c r r i c a t E n s i n e c r i n !t : / r ' m e : LJo "our5 \ t a " k s : t 0 0 Ans*er th€ lbllowing queslions in Engtishi
l.a) Wfite down the nane and p-opulation of rhe SAARC countries
b H o ! . l\c lri ficjarn n ' Dhal,a c r . 1 c a r . b . . , r s 6 " 5 \ 4 e n r ' o r c ) o u r iL g g ( . l i o n
c) Write short note on (any tr,r'o) 5 \ r(s .inriet. Lo:d .eedrng. ( r r < c n h o u . e c J l e . . l . d l \ V r r e dosn rh( ,r,.1 r).e.nrnS o , the t.J.l^{ilj aDbre\rlattons
5 O P E C , C N C , SALT. UNICEF, N A S A ,
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. \ u ( ornp-er. \-l.rral Gr.. s \L l .\tr..e!;c ATs Lrnitation Talksr UNICEF=Unjted Nations Inlemational Children's Emergency Fund, NASA-Narionat Aeronauiics
i - I + f
b) From the_lbllowing diagranr answer !h€ question 2_2 lJ measure the curRnt I^D. ii) measurc thc vollage Vr,^.
d) Detin€r " : . " ' ^ t.oad : * " factor, ptant tacror. -4i1"' f 4 \ n ) 2
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and Space Adminstration.l
b) Draw a fult wave brjdge reditier? 5 e) Nnne ofrhc capital ofthe following coLrnrries. 5
\ , 1 ) J a r r a . . I a b r n u n . p c - 1 u d J J . M o f o c c o , A U , r r i a . l \ ' l d \ a . m . r Y a n ! u r r e . l dbJnor-Bajril. l o . l u g , r l _ t : , o o r , M o r o e c o = R a b n r . A u s r r i a = B i e a n J . 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'd Sysncllrounousmotors. {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 f a c u n c n t t t a n s t u f m ( r
al c"r.ri"i. il'" ***iy bil 01 a r.ru"ronner
uuno"a.
maxrmunr demand is l00KW ard toad fhcror = 40% Ih. t a r i f f uscd as tk j5t per KW and.fk. 1.5 per KWtr c o n s u m p l i o r . r ^rr -:lr(
5
(t, c) Meition a device, whjch rrorks borb as rectrfjer and i , n , , : - - r e r I ] r ! $ rhc_,lo(^ o i r g r d r n o t rr. *ork n., pr incrple.,+ d l $ hJr i. JnJrt.tier.'!an
" r r : n s i . r m . r r . . u.id a, ,ut cg" or curent amplificr? Justify your ansrvcr.
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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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b) Name four types of circuit breakers useo rn powcl
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lAns: The people oibangladesh?rc dccustomed to leading sinple lite.De\'€lopment of the countly depends on the dev.lopmeni of villages. Expansion of Electr;city in rhe rurai area is very important. covemmenr has laken dillercnt sieps for ihls. Th€y have a plan to take electricity ro allpcople ivithin 2020.1
e w r i ( J D a f d e ' r T l on 'l \e{-ren c n \ i - o l n . n L developnienls on law and order sitlration in rhe country" )o
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l.a) Wriie in short, Jamuna MultiPu4rosc ofBangladesh.
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Bangladesh
Power Development
Board
liecruiimenl Exalnilration lbr Assislant Engineerc-I 999 . \ E I C T R i C A L E N I J IN E E R I N C\ - , , . / T r m e l. l 0 h o u r s N I a r k \ 1 0 0
" ' " . * - - . ' , n 1 . i ^ . t ! . e s i n n . . n I n e ' r ' h r Q u e ' r o N i , the implications of Bangabandhu Bridge 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
c o n r L r r < 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 and
problen ln Power secror.
.4. a) Describe S!6 circuil breakef O b) Draw a 2i0KV two bus lrar -
t b l l o " i n g r
-' 5
rcmedies of Low voltage 5
systen showing the (i) fwo generalors (l5oMw) each
1 5.75/230KV tmnslbnners.
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5. 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? Explarn
6.a) State working Principies its majof conponents.
if you keep open thc secondar! oi of an Ahemator tuentronrng b) Stxlc the conditions of synchronization. Erplain $e meanlng ofslnchronisiong 01 :n Allemarcr \aith the bus 8 7. Write sho( notes on any thrce ofthc follo\\'ingr- l5 (a) Y2K problem (b) SCADA Svstcn (c) Di.ectional ovcr'curcni relay. (d) ReveNc Po$'er Relay (e)
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Bangladesh
Power Development
Board
Rccruitment Exominarioir lbr Assistan! Engineer- I 99 8
Electrioal Engineef ing S€r-A
Timc: 2130 hours, Full Marks: 100
Ans$'er any six llucstions (Question no.l is compulsory) l.(r) Descdbe fi€ economical and socialaspects of
Bangladesh Bridge. 5
(b) M€ntion the rcason and remedies olsysten loss in (c) In the last world cup Fool Ball:
Who get the golden boot?
Narne the sladium where !!c llnalgame was pla-ved? Who-ras the referee in tlre l'inal malcb?
(d) Name the location , country and date of receni Nuclear explosions. Mention world bodies re-action. 5 A f < ) C i i e \ o u r a 5 \ e i . m e _ o - r h e n r ' n r i Taucr g(,.ralron p \ . c ) r o s L j r d e r r m p l e n r e n r a r i a - ; . B a n p l a d e s h . 5 5 5
F{ rEFrr{
2. (a) Discuss diferent protection provided in the
generator Against varjoub abnonnal conditions. 9 , h , \ har i r e n - : r r d r y a n o 1 . 1 ( , - - p p r c r e c r r u n l l \ r . ) \ " c l ' -. r f p r o -. e c -. r o n i . n o t g . o d substiiure l o f b e r r e r n a , - , e n a r . c .
, 5 3. (a) Wlai is scquence net$,ork? Discuss alllhree lypes of
sequence nets,orks? 9
(b) A three phase transmission line operating at l0 KV and having a resistance of 1 ohm and reactanc€ of4 ohoms is connecled to the generating station bus:bars though a 5MVA step-up translornrer having a reactance of5%. The bus-bars are supplied by a l0 MVA generalor having i0% rcactance. Calculate the shot ckt KVA to symmerical
laull between phases in it oscurs. . 6 j l r, lf( lodd cnd ofran.missirn line
i , dr r.c hrch r . k a g e rcrm;nrl d l i h e rr d n s i o r r r e r . 4. (a) Make a comparison betwcen 3-phase inductron and
sl/nchrono!6 moters, : 5
( h J D ' s c , r . s . e l r s l a n i n g o f I . p h $ c m o l o r s 5 (c) A 440V, 3 phase, 4-pole, 50H2, 37.3KW Yconnected induction motor has the folloving paraniete$. Rj=0.1 ohm. Xr=0.4 ohm, R?=0.15 ohm,Xr-0.44 ohn. The molor has stator core loss of 1250W and rotatio4al loss of
1000W. lt draws a no load line curent of 20W ala p.fof 0.09 (lag). When motor operates at a slip of3u, calculatc-i ) l n o r l l calculatc-i n c c - n ( n l a n d p . '
i i j F l e c l r o r r a g n e r i c r o r q u ( J e r e i o p e d i n N - V
Iii) OutpuL and cl'ficiency ofrnotor 5 5. Wite shol1 notes on any three ofthe following: l5 a) Buchhelz realy b) instrument imnslornrer
c) Brushless excitalions systen d) Push-pull ampliier e) D.C transmission
6. a) Discuss SF6 circuit Breaker 8
b) Diaw a 230KV two:bus bas syslem showing fie 0 lbllowing
i) Two generato$ (l50MW) each connected ftrough one I 5.?5/230KV transfo.mer
ii) 4 our going lines
iii) Two 230./132KV transformers iv) Bus P-r's
v l C l c
7. a) Expiain the basic principle oftap changing oia
transfonner. 7
b D ( r f i o e l h L l o \ s c q o c c u , in . r lr J n . l o m e f d n d \o \ h < )
can be mcasurcd, . 4
c) Dcrive the felation betlveen the losses lbr which maximum ellicicncy is obtained by a transfbn]rer. 4
Bangladcsh
Power Development
Board
j r 4 1 " i L n c n r E r a m r n c l i o n r b r Asrislan' L n p r n c e - < - l o q q
tr#4&
'q&JYset'B
EI-CTRICALENCINELRING
Timei 2.30 hours
Alsrver any six queslions in compulsory)
I.a) Describe the economical fl"ct Peane Trealy.
b) Menrion the reasoN and probleil in power seclor.
M a r k s : 1 0 0 EngUsh (Question no. I is
aspect of Chitagong Hili 5 remedies ol Low voltage
5 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 have iiiiJoscd saneiations on lndia & Pakjslan due to Nuclear e\plosion. Describe its inpaci on Bangladesh? 5 ( r Cr\ y^u" r\se\rrenl o n l h ( o . r \ a r < P o s e r ' e e n e r a r i n n policy now under implenenbrion in Bangladesh- _ 5 2. a) State $orking principles of an Altemator.
Mentionjng ils major componenrs. 5
b) Makc comparision amoung Squirel Cage DC & Slipring motom giving a! leasl one application for each. 5 c) State the coDdilion ol sysnchronizalion. Explain the meanirg ofsynchronizing 01'an altemator with buq. 5 l. !) lxplain percentage impcdance and Vector group of
po\ler lransformers. I
b) Descdbe prrallel opcration of transfonners stating the
c o n u i r . u ' s . i
c) Ilhrsirate any threc ol the foliowlng transforner: 6 i) lnstunenl ij) Auto iii) Dist bution
i l r a t , : h i _ g \ l G r o , r n d i r b .
4. a) Name thc va ous types ofclrcuir breaker. 1 b) Describe lead-acid and Nickel-cadmium balleries and
ballefy chargiDg system. 6
c) Describe ho{, a power line carri€r communica!]on works and \vhat arc its essential components. 5 5.a) Whar arc diflerences between a curenl ransloffner
and polenrial tnnstomier. 5
b) Dra$ phase diagrari of a potential transibmer and rliscuss the casues ofratjo eror & phase angle onor. 10 6.!l stale lhe benefils wbicl are divided fiom lhe dpplicnlion ol shunt capacitor on the load end of a cifcuil s|pplying r load oflaggimg fower f:c!or. 9 b) DraN a compa sion bel$'een shunt capacitor ancl synchronous condensor in respecl of{heir af,plicantions in
prr !\'er syslcrn 6
i. 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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ASFAN, AIDS, GATT. CDVT, E:]AF, SOE, NAN'{, FITA. U N " H C R s n d IP S A .
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= Non Aiigned Mor,rment, FIFA= Federalion ot lniemational Foorhall Association. l-i]JHCR:linired Nations High Comlrission tor Refugees, IPSA- Insritute oL Posl craduaF Studies oD Ag.icullurc I
Bangladesh
Power Development
Boatd
ElectricalEngineedng ' T i m c i 2 r l 0 h o r m . F u l l M a r k s r 1 0 0
Ans\\'er anysix queslbns (Question no.8 js oompulsoty) l.(a) Make a conparison betlveen synchro'lous and
indliction motors. i0
(b) Enumeratr 3nd explain at lelist lwo applicaiions ofa " . . h - o n o - . 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 20Kw
ii) a continuous motor load of:0KVA al0.5 Pflaggin€i Calculate the KVA rating ofthe capacilor bank requrred ,o jmprcve the powcr fac{or oikrads (n) aud {b) bgelhc. to unity. What is lhe new overali PJ i1 a1ler coffechon has been applied;the $,elding load is switched on. E
3. (lr) \lhar are the ditlerenL betwccn a curent lransfonnef
and a polcntial tmnsformer? 5
(b) Draw phasof.diagram ola potential lransfbmrer and discuss lhc causes of ratio eror dnd phase angle enor. l0 .4.(a) Explain thc drinciple ofoperation ofa thrce ph:ise
power imnslbnncr l
(b) Assrming rhat two lfaisfoflner having uneqlralratios ol lranslomation are conneclcd is parallel€d, jndicate how lhc total load dilidcs bctween !hem. 4 (c) what should bc the KVA rating ofeach transtbmrer rs a V-V bank when the three phase balanccd, load is 40 KVA? Ifa thi.d similar transfonncr is connected for opcratlon in della-della, whal is the rated capacity? \llui plrc€nlage increase is l?ling is effected in this \\ayl 8 5 . ( a ) G i v e a b e f d e s c f i p t i o n d i f t e r e n t k j n d o l g e n e r a t i o n
in BPDB syslem l 0
(b) What is dcnrand side ofmanagerncnt.hoi! can \\,e reduce gen€.arion shortlall by adopting such manage enll j 6. Write short nole on any lhree oflh€ fbllqwingi
a) Transmission line protection b) Reverse power fcl3y
c) SF6 circuit broaker d) Gas Turbine Powcr Plarl
e) Ripple factor respecl o{ reclifier output. 7. {aiitate the bcncfils which are derived ftom thc application ol shunr capacilor on the load cnd ol a aircuil supplying a load oflagging Fower fecior.
3
l
(b) Dr€N a comparlson behve€n shunt capacitor and synchronous condenser in fespec! oftheil apllicalion
oower system. 6
8.(a) U/ri1e short assay olr ''pd\aie sector paLlicipalion in powcr generation in Bangladcsh '. 5 (b) tr&al afc cnuses 01-systen Ioss in an electricity utilily J . d h J \ . L u p r c e ' . , 1
(c) Write short note on 'Jamuna mullipurpose Bndge
Project" 5
( d ) i ) What d o )oumean b y ' s o f t * a r o a n d " l l a f d i ' a r e " i n a c o - n r - r r r .
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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I'ICQ ({t&n sfu-sl]f{ ck€ ct!$ sftql . { C t i r ' : u i i : {114)
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,J'rf culYe) (lx a) . ahar,rcled:,lics cufves iall corfi guraiions)
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- i l \ 4 ) Clondltion for Parallel oPeraiior ofsingle-phase & r h r e ! - p h a s c I r ' r n s t o r r n e l
C ' c " r r c r . e l L c r . \ - \ . u _ c ( r i o n i l \ ' c c l o r ( i r o ' D lnstrunlenl lranslbrier
Difference betNcen gcneralor and mokx Sigrlifioance ofthe uack EtuF
Torque and Power relarion
. Eqrivalent circuil ofan Induction ffotor . SliD and fclated Problem
" Iruifload iorque, Maxirnr'rnr torqre and slafling lorqu€ related Problem
. Power slages in an Ind olion notor and related Problen'l
. Why staficf usc in InCuction rnoior'/ . \Vbar is synchronizing?
. Condilion lbr synchfonizing ofa single and threc-phase Altemaior
. Comparison beiween Syrrohronolts lvlolor and Digitrl Elettronics:
(Less lmpr. fbr BUET Exam )
. Show that a positive-logic NOR gale rs fie same phvsical gat€ as a negativelogic NANDrnd vrce versa . Show that a posliile-logic AND gare is the same
r h . c 1 ! . e a " - J g i r i . oric u( and \ ice \<f'a . Basic gate implement with NoR andNAND gale
Machine: (2x4:3)
. Problem or 'I fansfomrer tesl, loss and cfficiency
lnd clion Motol
Co!nrnunication: ( i r " l = 1 2 )
. N,lod laiion & Demodulalion (defirition' input/ouipuL \\avefonn. mod hlion irdex, equ'rtion, and probleD' . Dlgital Nlodulation (inpul/outpu! wavefonn' equatron) . Nyiuist SamplingTheorem
. 8it Error Rate (BtsR,\ relaled probLem
. Dcfine F-rlarg. One Erlang and feidted p[C'hlems' . OSI.efercnce nodci and luncrions
. 50rial & Pardllel daia hansnnssron . Clereral. Porvef and Comniunication relaled
Power s]sten: (2x4=8)
. Load crrles, Load duation crrrve/Chrcnological load
Definition and concept on connected load, Maxrmunl dcma.d, Demand I'aclor, Average load, l.oad faclor, Dirersity factor, Planr caprcity factor and Planl use iaclor also relared prcblon
What do tou ncan by powef syslenl Draw a typical power systcul oneline diag|arn
Poscr laclor and rclnlcd problem $hy high vollage transmils?
Ferranti Eloct Skin Flft-ect C o f o n a I l t e c l
Reiay cir.uil and i1s operation Dill'ercnce belween Switch & CB What are dre Faults ii a po\ver systenl?
Various lypes olsub-stations, Transmission line ruling and gcnerating Vohage in Bangladesh
Conccpl on Crounding, Load Shedding and l-oad Management
Advantagcs of Interconneclions
Conccp! or SCADA ond dmw ifs.Diagfam Concept on Ren€waLrle energ),
fhc One-l;ne diagram, Rcactance diagram ancl Impcdance Diagfaln
hrporlancc 01,l,ord llow s dy, fclated problem Whal iribrmaiior obLained liom Load-ilo'r siudyi Whal arc Seqrence lmpedrnce and Sequence NetwoR?
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Electrical
Total
Marks-7o
1. Which is the lightest particle ofan atom? (a) Neutron (b) Electroni (c) Proton (d)All 2. Ampere second could be the unit
oi-(a) Powe. (b) Conductance (c) Energy (d) Chargel 3 l he ratio of lhe resistance of a 1 00w, 220V lamp to thal o l a 1 0 0 \ \ la m p u i l l b e
neafl\-(a) 4\i (b) 4 (c) 1/2 (d) r/a.
4. Il the length and cross section ol a piece of conductor are both doubled x hat be ils resistance (initial rcslslance R)? (a) 4R 1/ (b) 2R (c) R (d) 0.25R.
5. Tbe number of eleutron ir1 the outermost orbit of carbon aiom
is-(a) 8 (b) 2 . (c) +{ (d) 6.
6. which one ofthe following is semi-conductor?
(a) Copper (b) Siliconi (c) Neon (d) Lithum 7. Wlich is fie highcsr system voltge'in Bangladcsh?
(a) 33KV ACr (c) 230KV AC{
(b) ll2KV AC
(d) 23oKV HV DC lilk.
8. For an R-L load
(a) Active polver is greaier than apparcnt power. (b) Reactive power is greatef than apparenl po$er.
(c) Appar€nr power is grcaler than both aclive and reaclive (d) All the equal.
a . One Hrf5r po$e- ; equdl L u
-(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 bilateral p J r a r r e l e f - '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 r d r T o . n c r e a s e l h < (u n e - c a p a ( 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 \r 15. A radio slation broadcasts at 30n wave lenglh The iiequency ofbroadcast will
be-( a r J 0 H / \ o l j0 " 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 losses
I7.The type 01 oll $,hich is soilable as lrarsformer oil
is-(a) Aninal oil (c) Mineral Oil I
18. The function of transibmer oil in tnnsformer is-(a) To provide protection against lightlng.
( o r T o f.o\ide insulalion a n d c o o l i n g l , c , T,J p - o r e c t i o n a g a i r s l s n o n - c i r c t r r l n g (d) All ofthe above.
19. Bucholz relay used
on-a) At cooled transformer b) Oil cooled transfomersl c) w€lding transtormers d) Furnace transformers 20. Burden of curent lransformer js usually expressed ln-(a) Volrs b) Amperesi c)Voll anperes d) Kilowalt. 2 l P e r m . s . i b l e \ " r : a r i o n i . p o $ e ' l r e o L r e n c ) i r Bangladesh
is-( a ) r 0 . 1 % is-( b ) 1 1 % \ i is-( c ) t 5 % ( d ) 1 1 0 % 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 reliable
23 Common declared distributjon voltage in Bangladesh for low voltage cjrcuit Is_
(a) 230
v!
6) 440
V (c) 2s0
v (d) 380
v
24. 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 , n s u r < d b ) e a c r r e 5 r c l o r "
fa) row!
(b)
3ow
(c)
9ow
(d)
6ow
il. 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 lossll
28.The copper loss of a transfonner at full load is 40W.
What would be al halfload"
(a) 20w (b) 10w I (c) 40W
29. 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 5Amp 14. KVA is equal
!o-(a) KVAR cos d (c) KVAR ian d
35. 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 . J 7 i a p o . I p h a . e ;n d , c l , o n r r o t o r o p e r a e ' f i o m a supply whose frequency is 50 Llz wllal is the synchronous . ; ; ; " - p ' " b ) 2 0 0 r ' r p ' ' c r 2 5 0 0 r p n d ) l 5 0 0 r D m ' / J 8 . l h e 5 ] n c h r o n o L ' , p e e d o f " i - r d t l l r i o n n ' o l o r is 1 5 0 0 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 ( a t B ) J r i n g c o p p e r c o r c l b ) B ) u s i n g s o l r d c o - e \ c ) B \ l . m r a r i n ! ' l r < c o r e J r d J \ o n e ofrbo\e
41. Does the transformer secondary is open?
dra* an) curcnt \ahen its (a) No (b)Yes{ (c) Take rated cunent (d) None 42.\)!4lich one is the synchronous condenser-f a r E l e c r r o l ) r i c ( 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 l
than sendjng (b)
(c)
The variation of frequency
When sending end voltage is equal to recervlng eno vollage.
(d) None ofthe above
44. 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 1 d r A l l o f r h e a b o r e / 4 5 l o t : l p o w e r g e n e r a L i o n c a p a L i t ) o l B a i g l a d e s h 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. v
changed ftom 3600 enf 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 5 0 . T h e p o w e r f a c r o r o f a n A C c i r c u i t i \ g i v e n b ) -L a ; t l c o . d v r b l V l s i n , l c ' F Z r d l tX
it. The phase angle ofa series R_L-C circuit is leading i1-r i1-r i1-r X L - 0 \ b i1-r R - 0 t t i1-r X > X i i1-r d i1-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-r a i o a c is-r b t c t is-r is-r { f l a c b r d r \ll oflhe 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 ^ 5 5 I h e d r r e c l i o n o i i n d u c e e m c r n b e fo u n d b ) -(a) Lenz's lani (b) Fleming's Right hand rule (b) Kirchoffs law (d) Ohm's law
56. When a 400 Hz trunsformef is opetaled KVA 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 \ . f h e p f l m a r y p a n \ o l . 1 - 0 I n d L , c l : o r l T o r o f a r e
-(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 Aitemalof having 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 a rrnsforme. is t o measuree
its-(a) Copper Ioss (c) Total Loss
63. A hnsformer has negative volrage rcgulaiion when its load porver factor
is-, . is-, 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 negarive remparature co-elfi eient of rcsistance,
(lr) Ampercirour (b) Coulomb (c)JoLrle (d) Newton. 6 9 . l i a 2 2 0 V h c a t e f i s u s e r o l r I l 0 V supply w h a y o u l d b e the 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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