EE-Objective Paper-II (2017)

Transcription

1 ESE-06 ESE-07 EE Objective Paper-II EE-Objective Paper-II (07). If a square matrix f rder 00 has exactly 5 distict eige values, the the degree f the miimal plymial is (A) At least 5 (B) At mst 5 (C) Always 5 (D) Exactly 00 Sice the give matrix f rder 00 has exactly 5 distict eige values. The degree f the miimal plymial is 5 i.e. at least 5.. The sluti f the differetial equati y x dy x y dx 0 is (A) (B) (C) (D) x c y c x y c x y c D.E ca be writte as x 4 dx dy 0 x y Itegratig, we get x y dx dy C x y x y C x y C isthesluti. The geeral sluti f the differetial equati 4 d y d y d y dy 4 dx dx dx dx y 0 is A.E is y c c x e c cs x c si x (A) x (B) x 4 y c c x e c cs x c si x (C) x 4 y c c x e c cs x c si x (D) x 4 y c c x e c cs x c si x 4 4 m m m m 0 m m m 0 m,, i The geeral slutiis y x 4 C.F C C x e C csx C si x 4. Give the Furier series i, fr f(x) = x cs x, the value f a 0 will be (A) (B) 0 (C) (D) f x xcs x is dd fucti a The Furier series expasi f the sawtthed wavefrm f(x) = x i, f perid gives the series,... The sum is equal t 5 7 (A) (B) 4 (C) f x x isdd fucti 0 Furier series is f x 6 b si x... (D) 4 ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

2 ESE-06 ESE-07 EE Objective Paper-II where b 0 f x si x.dx cs x si x x cs cs cssi x f x six Six si x puttig x, weget What is the value f m fr which x x my is harmic? (A) (B) (C) (D) Let x x my beharmicfucti 0 m 0 m x y 7. Evaluate c dz, where c is x y. zsi z (A) (B) (C) 0 (D) Clearly z=0 is a ple f rder lies iside C: x y d Res f z Lt z 0.f z z=0 z0 dz d z si z zcs z Lt Lt z0 z 0 dz si z si z 0 frm 0 z si z Lt 0 z0 zsi zcsz dz i Resf z 0 zsi z z=0 C 8. The sum f residues f fz z z z at its sigular pit is (A) 8 (B) 4 (C) 0 (D) 4 Z= is a ple f rder ad z = is a ple f rder d Res f z Lt z.f z z= z dz d z z z Lt Lt 4 z z dz z z z ad Res f z Lt z. f z Lt 4 z= z z z sum f the residuesis0 9. A bag ctais 7 red ad 4 white balls. Tw balls are draw at radm. What is the prbability that bth the balls are red? (A) 8 55 (B) 55 Ttal balls = s C (C) C Pr bth ballsarered 55 C (D) A radm variable X has the desity fucti f x K, where x. The the x value f K is (A) (B) (C) (D) ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

3 ESE-06 ESE-07 EE Objective Paper-II f xdx K dx x Kta x K 0. A radm variable X has a prbability desity fucti 0 x k x e ; x 0 f x 0; therwise ( is a iteger) with mea. The values f {k, } are (A), (B), 4 (C), 0 (D) {, } f x dx K! K! ad E X x.f x dx K.! K 0. What is the prbability that at mst 5 defective fuses will be fud i a bx f 00 fuses, if % f such fuses are defective? (A) 0.8 (B) 0.79 (C) 0.59 (D) 0.5 Let P P defectivefuse % 0.0 r r 00 P 4 x e ad P X x is piss prbability x! P at mst 5defectivefuses P x 5 r P 0 P P P P 4 P 5 r r r r r r e If X is a rmal variate with mea 0 ad stadard deviati 5, what is prbability 6 X 4, give A (z = 0.8) = 0.88? (A) 0.88 (B) (C) 0.88 (D) 0.66 X 0 X N0, 5 ad Z 5 fr x 6 z 0.8 ad fr x 4 z 0.8 r r P 6 X 4 P 0.8 Z 0.8 A z z 4. Fr high speed readig ad strig f ifrmati i a cmputer, the cre shall be f (A) Ferrite (B) Piezelectric (C) Pyrelectric (D) Ferrmagetic abve 768 C 5. Sft magetic materials shuld have (A) Large saturati magetizati ad large permeability (B) Lw saturati magetizati ad large permeability (C) Large saturati magetizati ad lw permeability (D) Lw saturati magetizati ad lw permeability 6. Gauss s therem states that ttal electric flux emaatig frm a clsed surface is equal t (A) Ttal curret desity the surface (B) Ttal charge eclsed by that surface (C) Ttal curret the surface (D) Ttal charge desity withi the surface ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

4 ESE-06 ESE-07 EE Objective Paper-II 7. Orbital magetic mmet f a electr, i a atm, is f the rder f (A) 0. Bhr maget (B).0 Bhr maget (C) 0 Bhr maget (D) 00 Bhr maget 8. Whe the temperature f a ferrmagetic material exceeds the Curie temperature, it behaves similar t a (A) Diamagetic material (B) Ferrimagetic material (C) Paramagetic material (D) Atiferrmagetic material 9. Phtcductivity is a characteristic f semicductrs. Whe light falls certai semicductrs, it (A) Sets free electrs frm sme f the atms, icreasig the cductivity (B) Ejects electrs it space (C) Establishes a ptetial differece creatig a surce f EMF (D) Prduces heat raisig the temperature. 0. The resistivity f itrisic germaium at 0 C is 0.46 m. What is the itrisic carrier desity i at 0 C, takig the electr mbility as 0.8 m /V-s ad hle mbility. p as 0.8m / V s? (A) (C) / m (B) / m (D) e. p.e p / m / m i p e fr a itrisicsemicductr i i i p e / m 9 9. Fr itrisic gallium arseide, cductivity at 6 rm temperature is 0 m, the electr ad hle mbilities are, respectively 0.85 ad 0.04 m /V s. The itrisic carrier ccetrati at rm temperature is. (A) (C) i m (B) m (D) p e / m m m. A cpper cductr has a resistace f 5.5 at 0 C. What is its percetage cductivity at 6 C (t earest uit value) assumig the temperature cefficiet f cpper as per C at 0 C? (A) 54% (B) 68% (C) 94% (D) 98% RT R(. T). At temperatures abve a limitig value, the eergy f lattice vibratis, i a cductr, icreases liearly with temperature s that resistivity icreases liearly with temperature. ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 4

5 ESE-06 ESE-07 EE Objective Paper-II I this regi, this limitig value f temperature is called. (A) Berulli temperature (B) Curie temperature (C) Debye temperature (D) Neel temperature 4. Csider the fllwig statemets :. The critical magetic field f a supercductr is maximum at abslute zer.. Trasiti temperature f a supercductr is sesitive t its structure.. The crictical magetic field f a supercductr is zer at its critical temperature. 4. Supercductrs shw very high cductivity belw the critical temperature. Which f the abve statemets are crrect? (A), ad ly (B), ad 4 ly (C), ad 4 ly (D), ad 4 ly 5. What is the crrect sequece f the fllwig materials i ascedig rder f their resistivity?. Ir. Silver. Cstata 4. Mica 5. Alumiium Select the crrect aswer usig the cdes give belw: (A),5,, ad 4 (B) 4,5,, ad (C),,,5 ad 4 (D) 4,5,, ad 6. I the first Cauer etwrk, with a ple at ifiity, the first elemet must be (A) Series capacitr (B) Series iductr (C) Shut capacitr (D) Shut iductr Ple f Ifiity meas S term by sythetic divisi is Iductr 7. The ttal magetic mmet. is called saturati magetizati.. depeds the umber f magetic diples per uit vlume, the istat electric curret ad the area f the curret lp. Which f the abve statemets is/are crrect? (A) ly (B) ly (C) Bth ad (D) Neither r 8. Which f the fllwig statemets are crrect regardig dt prduct f vectrs?. Dt prduct is less tha r equal t the prduct f magitudes f tw vectrs.. Whe tw vectrs are perpedicular t each ther, the their dt prduct is zer.. Dt prduct f tw vectrs is psitive r egative depedig whether the agle betwee the vectrs is less tha r greater tha. 4. Dt prduct is equal t the prduct f e vectr ad the prjecti f the vectr the first e. Select the crrect aswer usig the cdes give belw: (A), ad ly (B), ad 4 ly (C), ad 4 ly (D), ad 4 ly 9. Susceptibility f a diamagetic material is. Negative. Psitive. Depedet the temperature 4. Idepedet f the temperature ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 5

6 ESE-06 ESE-07 EE Objective Paper-II Select the crrect aswer usig the cdes give belw: (A) ad ly (B) ad ly (C) ad 4 ly (D) ad 4 ly 0. Csider the fllwig statemets :. The susceptibility f diamagetic materials is small ad egative.. The susceptibility f para ad ati ferrmagetic materials is small but psitive.. The susceptibility has a fiite value fr free space r air. Which f the abve statemets are crrect? (A) ad ly (B) ad ly (C) ad ly (D), ad. Eddy curret lsses i trasfrmer cres ca be reduced by the use f. Slid cres. Lamiated cres. Ferrites Select the crrect aswer usig the cdes give belw: (A) ad ly (B) ad ly (C) ad ly (D), ad Eddy curret lsses ca be reduced by havig thi lamiated cstructi l R if a R I e. a Ferrite material will pssess mre magetic prperties tha cductig prperties, Therefre electr cducti will be less ad hece Eddy lsses als less.. The pheme f magetstricti ccurs whe a ferrmagetic substace is magetized resultig i (A) Heatig (B) Small chages i its dimesis (C) Small chages i its crystal structure (D) Sme chage i its mechaical prperties. What type f defect causes F-ceters i a crystal? (A) Stichimetric defect (B) Metal excess defect due t ai vacacies (C) Metal excess defect due t extra catis (D) Frekel defect Schttky Defects 4. Csider the fllwig statemets :. Supercductrs exhibit rmal cductivity behavir abve a trasiti temperature T c.. Supercductrs lse their supercductig ature i a exteral magetic field, prvided the exteral magetic field is abve a critical value.. High T c supercductrs have T c values i the rage t K. Which f the abve statemets are crrect? (A) ad ly (B) ad ly (C) ad ly (D), ad T T Lssf Super Cductivity c H H Lssf Super Cductivity c 5. Supercductivity is a material prperty assciated with (A) Chagig shape by stretchig (B) Stretchig withut breakig (C) A lss f thermal resistace (D) A lss f electrical resistace ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 6

7 ESE-06 ESE-07 EE Objective Paper-II 6. A atm i a crystal vibrates at a frequecy, determied by. Crystal heat curret. Crystal temperature. The stiffess f the bds with eighbur atms Select the crrect aswer usig the cdes give belw: (A) ly (B) ly (C) ly (D), ad 7. Csider the fllwig statemets:. Na meas 0-9 s that a materials have a rder f dimesi higher tha the size f atm ad cme i the frm f rds, tubes, spheres r eve thi sheets/films.. Na materials have ehaced r chaged structural prperty.. Na elemets led themselves t mechaical prcessig like rllig, twistig, psitiig. 4. Na elemets shw imprtat electrical, magetic ad ptical characteristics that are useful i electrical idustry. Which f the abve statemets are crrect? (A), ad ly (B),, ad 4 (C) ad 4 ly (D), ad 4 ly 8. The vltage ad curret wavefrms fr a elemet are shw i the figure. it A 0 s t vt V 0 s t The circuit elemet ad its value are (A) Capacitr, F (B) Iductr, H (C) Capacitr, 0.5F (D) Iductr, 0.5H By cmparig V(t) ad i(t) we ca say that dit V t K dt S it is iductr, but dit V t L dt L L H dit dt 9. I a cected graph, the ttal umber f braches is b ad the ttal umber f des is. The the umber f liks L f a c-tree is. (A) b (B) b (C) b + (D) b + Number f liks =[ N f brach] [ ( f des) -] = b-(-) = b Fr the circuit shw, Thevei s pe circuit vltage V c ad Thevei s equivalet resistace R eq at termials A B are, respectively, 50V (A) 6.5 V ad.5 (B).5V ad 5 (C) 6.5V ad 5 (D).5V ad.5 T fid 5 R R 5 R V OC, remve R L ad measure A B R R L V OC ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 7

8 ESE-06 ESE-07 EE Objective Paper-II 50V VX 50 VX VX 75 0 VX V Vc VX.5V R th 5 / /.5 5 / /5 5 / / / / V.5 X V c 4. What is the value f resistace R which will allw maximum pwer dissipati i the circuit? 0 5 a 8V 0 R (A).66 (C) 8. (B) 0. (D) 7.66 R fr maximum pwer trasfer b R R / r th 4. What is the curret thrugh the 8 resistace cected acrss termials, M ad N i the circuit? 8V (A) 0.4 A frm M t N (B) 0.9 A frm M t N (C) 0.9 A frm N t M (D) 0.4 A frm N t M 8 VX 8 VX VX 0 VX / V X M I MN ; INM 0.4A 8 N 8 V V 4. Tw resistrs f 5 ad 0 ad a iductr L are cected i series acrss a 50 cs t vltage surce. If the pwer csumed by the 5 resistr is 0W, the pwer factr f the circuit is (A).0 (B) 0.8 (C) 0.6 (D) cs t P 5 0W Irms R I rms V rms 5 V 50 I rms Z 5 R Z cs rms 5 0 L R cs 0.6 Z A tw-elemet series circuit is cected acrss a AC surce give by e 00 si 4t 0 V. The curret is ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 8

9 ESE-06 ESE-07 EE Objective Paper-II the fud t be i 0 cs4t 5A. The Parameters f the circuit are (A) R = 0 ad C = 60 F (B) R = 4.4 ad C = 5 F (C) L= 45mH ad C = 5 F (D) L = 45mH ad C = 60 F e 00 si4t 0 e i 0 cs 4t 5 I 0 5 e Z 0 85 I 0 5 0cs 45 jsi 45 0 j0 0 j0 Z R j ; R C 0 C C 5f Hw fast ca the utput f a OP Amp chage by 0V, if its slew rate is V/ s? (A) 5 s (B) 0 s (C) 5 s dv Chagef utput vltage 0V Slew ratev dt chagef time max 6 s 0 V S dv dv 0 dt 0s 6 dt s 0 (D) 0 s 46. A three phase star cected lad is peratig at a pwer factr agle, with beig the agle betwee (A) Lie vltage ad lie curret (B) Phase vltage ad phase curret (C) Lie vltage ad phase curret (D) Phase vltage ad lie curret Key: Bth (B) ad (D) 47. Fr a tw-part reciprcal etwrk, the three trasmissi parameters are A = 4, B = 7 ad C = 5. What is the value f D? (A) 9.5 (B) 9.0 (C) 8.5 (D) 8.0 Fr reciprcal etwrk AD - BC = 4D 5 4D 6 D Csider the fllwig as represetatis f reciprcity i terms f z parameters:. z = z. z = z. z = z Which f the abve represetatis is/are crrect? (A) ly (B) ly (C) ly (D), ad Z Z 49. A parallel plate capacitr is made f tw circular plates separated by a distace f 5mm ad with a dielectric with dielectric cstat f. betwee them. Whe the electric field i the dielectric is 0 4 V/m, the charge desity f the psitive plate will be, early. (A) C/m (B) C/m (C) C/m (D) C/m Key: (*) EA E Q CV d d Q E E A d mC / m 9 4 ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 9

10 ESE-06 ESE-07 EE Objective Paper-II 50. What is the ptetial drp acrss the 80 resistr i the figure? (A) 0V (B) 5V (C) 0V (D) 5V V Whe 7/0.09 V.I.R cable is carryig 0A, a drp f V ccurs every m. The vltage drp i a 00m ru f this cable whe it is carryig 0A is early (A) 4.V (B).V (C).V (D) 0.4V If 0 A curret carryig Vltage drp is V fr m If 0 A curret carryig Vltage drp is 0.5V fr m S fr 00m (00/)*0.5=4.V 5. Csider the fllwig statemets: If a high Q parallel resat circuit is laded with a resistace. The circuit impedace reduces.. The resat frequecy remais the same.. The badwidth reduces. Which f the abve statemets is/are crrect? (A) ly (B) ly (C) ly (D), ad Fr parallel Resat Circuit Q RC 80 5V 0 LC sice is idepedet f R, it will t chage B, s whe R, B.W RC 5. A draw wire f resistace 5 is further draw s that its diameter becmes e-fifth f the rigial. What is its resistace with vlume remaiig the same? (A) 5 (B) 5 (C) 65 (D) 5 Sice vlume remais same, we ca write 4 4 r h r h d d h d h h h d it isgive that d 5 h 5h d L Wekw R A L L R AL V R R l l l R R l 54. The three -iductive lads f 5kW, kw ad kw are cected i a star etwrk betwee R, Y ad B phases ad eutral. The lie vltage is 400V. The curret i the eutral wire is early (A) A (B) 4A (C) 7A (D) A PRN V R.IR ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 0

11 ESE-06 ESE-07 EE Objective Paper-II P 50 R IRN.65 0 V 400 R B IBN V 400 B Y IYB 0 V 400 Y P 0 P 0 I I I I N RN BN YB Kirchhff s curret law is applicable t. Clsed lps i a circuit. Jucti i a circuit. Magetic circuits Which f the abve is/are crrect? (A) ly (B) ly (C) ly (D), ad 56. Which f the fllwig are satisfied i a liear etwrk?. Assciative. Superpsiti. Hmgeeity 4. Bilaterality Select the crrect aswer usig the cdes give belw: (A) ad ly (B) ad 4 ly (C) ad ly (D) ad 4 ly R N B Y kw 5kW kw 57. E H E is t (A) Mdified Faraday s law (B) Gauss s law (C) Bit Savart law (D) Mdified Ampere s law 58. Csider the fllwig statemets:. Netwrk therems are t derivable frm Kirchhff s law.. T get the Nrt curret, e has t shrt the curret surce.. Thevei s therem is suitable fr a circuit ivlvig vltage surces ad series cectis. Which f the abve statemets is/are crrect? (A), ad (B) ly (C) ly (D) ly 59. What are the Thevei s equivalet vltage V TH ad resistace R TH betwee the termials A ad B f the circuit? (A) 4.6 V ad 0 (B) 4.67 V ad 0 (C) 4.6 V ad 70 (D) 4.67 V ad 70 0 Vth V R 68 / /0 70 th VS 00 R68 R00 R0 60. What is the curret thrugh the 5 resistace i the circuit shw? A B ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

12 ESE-06 ESE-07 EE Objective Paper-II (A) 5.A (B) 4.66A (C).66A (D).A Usig surce trasfrmati 0 5A I.66A I.66A 5 5 0A 6. Csider the fllwig statemets with regard t Lissajus patter acro:. It is statiary patter the CRO.. It is used fr precise measuremet f frequecy f a vltage sigal.. The rati betwee frequecies f vertical ad lgitudial vltage sigals shuld be a iteger t have a steady Lissajus patter. Which f the abve statemets is/are crrect? (A) ly (B) ly (C) ly (D), ad Lissajus patter is a statiary patter. Ex: y y y x All the patters are idepedet f time. Lissajus patter ca be used fr measuremet f frequecy f a ukw sigal. x 60 x If f x = frequecy f kw sigal f y = frequecy f ukw sigal the fy.f hriztaltagecies aiteger f.f verticaltagecies x Ex: fy f x fy f 6. Electric flux eclsed by a surface surrudig a charge is equal t the amut f charge eclsed. This is the statemet f (A) Faraday s law (B) Lez s law (C) Mdified Ampere s law (D) Gauss s law 6. If a psitively charged bdy is placed iside a spherical hllw cductr, what will be the plarity f charge iside ad utside the hllw cductr? (A) Iside psitive, utside egative (B) Iside egative, utside psitive (C) Bth egative (D) Bth psitive Q Q Q x ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

13 ESE-06 ESE-07 EE Objective Paper-II 64. Csider the fllwig statemets regardig Peer-t-Peer cmputig evirmet:. I this system, cliets ad servers are t distiguished frm e ather.. All des distributed thrughut the system (withi) are csidered Peers ad each may act as either a cliet r a server.. Peer-t-Peer system assuredly ffers certai advatages ver the traditial cliet server system. 4. Peer-t-Peer system is just a replica f the file server system. Which f the abve statemets are crrect? (A),, ad 4 (B), ad ly (C) ad 4 ly (D), ad 4 ly 65. What is the ctal equivalet f (56.5) 0? (A) (B) (C) (D) Itegral part 66. What is the hexadecimal represetati f (657) 8? (A) AF (B) D 78 (C) D 7 (D) F Re maider Octal t Biary Biary Hexa decimal 00 AF 67. I ptetial trasfrmers, the secdary turs are icreased slightly ad the primary ad secdary widigs are wud as clsely as pssible t cmpesate fr (A) Phase agle ad rati errr, respectively (B) Rati ad phase agle errr, respectively. (C) Ay eddy curret lss ad hysteresis lss, respectively (D) The hysteresis lss ad eddy curret lss, respectively I ptetial trasfrmer, k, R > k. S rati errr is preset due t R >. (= turs rati).t reduce rati errr, actual rati (R) is reduced s fr reducig R, has t be reduced. If secdary widig turs are icreased, N P turs rati decreases,. NS Phase agle errr (d) is directly prprtial t magetizig curret ( I m ). if θ reduced, I m als reduces. If primary ad secdary widigs are very clse tgether, leakage flux is reduced, the I m als reduced. 68. The y-parameters fr the etwrk shw i the figure ca be represeted by I 5 I V V 6 ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

14 ESE-06 ESE-07 EE Objective Paper-II (A) y (B) y (C) y (D) y V V V V I ; I / 5 / 5 Y / 5 / I the tw-prt etwrk shw, which f the fllwig is crrect? I 5 I V a b i a i b (A) i b = i c (B) i a =i d (C) i c =i d (D) i a =i b 70. A 4 digit vltmeter is used fr vltage measuremet. Hw wuld 0.755V be displayed i V rage? i c i d V c d (A) 0.755V (B) 0.75V (C) 0.075V (D) 0.075V R, is f full digits 0 4 R O IV scale, R 0 V 0.000V 0.755V displayed as V 4 digits 7. Which f the fllwig equatis represet gauss s law adapted t a hmgeeus istrpic medium? D.ds dv. H D. s v..j E Select the crrect aswer usig the cdes give belw: (A) ad 4 ly (B) ad ly (C) ad 5 ly (D),, 4 ad 5ly Gauss s law s D.ds Q.d ec U By applyig divergece therem V.D d.d.d.e fr istrpic medium 7. Csider the fllwig statemets with regard t Mvig Ir (MI) istrumets:. These istrumets pssess high peratig trque.. These istrumets ca be used i ac ad dc circuits. ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 4

15 ESE-06 ESE-07 EE Objective Paper-II. Pwer csumpti i these istrumets is lwer fr lw vltage rage. Which f the abve statemets are crrect? (A) ad ly (B) ad ly (C) ad ly (D), ad Fr MI istrumet, Td I dl Td I d If I is high, T d is high. The rage ca be exteded by shuts/multipliers; which csume extra pwer 7. A curret f 0 5si t si t is measured usig a mvig ir istrumet. The readig wuld be (A) 08.8A (B) 0.00A (C) 0.8A (D).75A MI meter measures RMS value. 5 Irms A 74. Which e f the fllwig methds is used fr the measuremet f high resistace? (A) Carey Fster bridge methd (B) Substituti methd (C) Lss f charge methd (D) Ptetimeter methd Fr high resistace measuremet, lss f charge methd is used. 75. Csider the fllwig statemets with regard t iducti type wattmeter:. Ca be used bth ac ad dc systems.. Pwer csumpti is relatively lw.. It is accurate ly at stated frequecy ad temperature. Which f the abve statemets is/are crrect? (A) ly (B) ly (C) ly (D), ad Iducti type wattmeter wrks ly fr AC because fr DC, iducti is t pssible. Due t presece f mre weight f mvig system, pwer csumpti is relatively high. Sice pressure cil is highly iductive the meter cpper shadig bads are calibrated at supply frequecy ly. S if ay ther frequecy is used readig will chage. Due t temperature, widig resistace icreased, s eddy currets decreased, the drivig trque T d is decreased ad simultaeusly brakig trque decreased. Hece temperature effect is almst ullified. 76. A cmputer system has a cache with a cache access time T C = 0s, a hit rati f 80% ad a average memry access time T M =0s. What is the access time fr physical memry T P? (A) 90s (B) 80s (C) 60s (D) 0s EAT 0.80(0) (0.0)T T T p 0 Tp If has the value, the the C laguage statemet : a [+ + ] = + + ; assigs (A) t a[5] (B) 4 t a[5] (C) 4 t a[4] (D) 5 t a[5] Key: (*) p p ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 5

16 ESE-06 ESE-07 EE Objective Paper-II Mdifyig a bject betwee tw sequece pit mre tha ce prduces udefied behaviur Ne f the pti matchig 78. The miimum umber f arithmetic peratis required t evaluate the plymial P(X)=X 5 +8X +X fr a give value f X usig ly e temprary variable is (A) 8 (B) 7 (C) 6 (D) x 8x x x x 8x x x x 8x x x x x 8 x x x x x A freewheelig dide i phase- ctrlled rectifiers (A) eables iverter perati (B) is respsible fr additial reactive pwer (C) imprves the lie pwer factr (D) is respsible fr additial harmics Due t freewheel dide, V ut is always psitive ad iductr discharges the eergy thrugh freewheelig dide t lad. Hece lad gets mre pwer, V ut icreases ad iput pwer factr imprves. 80. Csider the fllwig statemets regardig electrical cductivity :. It icreases with temperature i semicductrs.. Its icrease with temperature is expetial.. It icreases i metals ad their allys, liearly with temperature. Which f the abve statemets are crrect? (A) ad ly (B) ad ly (C) ad ly (D), ad 8. What is the effect the atural frequecy ad dampig factr i the ctrl systems whe derivative cmpesati is used? (A) icreases ad decreases (B) remais uchaged ad icreases (C) remais uchaged ad decreases (D) decreases ad icreases W remais uchaged ad icrease Let G(s) W S S W Fr derivative ctrller W KDS SS W G s K S D C.E G s H s G s 0 0 D ad H(s) S W W T S W 0 W uchaged 'S' cefficiet icreases icreases 8. Csider the fllwig cmpets i a multistage R-C cupled amplifier:. Parasitic capacitace f trasistr. Cuplig capacitace. Stray capacitace 4. Wirig capacitace Which f the abve cmpets effectively ctrl high frequecies? ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 6

17 ESE-06 ESE-07 EE Objective Paper-II (A), ad (B), ad 4 (C), ad 4 (D), ad 4 The cmpets effectively ctrl high frequecies are parasitic, stray ad wirig capacitrs. But fr lw frequecy ctrl, cuplig capacitr is used. 8. A Wie Bridge Oscillatr is suitable fr. Audi frequecy applicatis. Radi frequecy applicatis. Very lw frequecy applicatis Which f the abve frequecy applicatis is/are crrect? (A) ly (B) ly (C) ly (D), ad The mst suitable scillatr fr audi ad sub audi frequecy (0 t 0 khz) is Wei bridge scillatr. 84. I a R-C phase shift scillatr usig FET ad secti R-C phase shift etwrk, the cditi fr sustaied scillati is (A) 6 (B) 9 (C) 9 4 (D) R d Where, R A tued cllectr scillatr has a fixed iductace f 00 H ad has t be tuable ver the frequecy bad f 500 khz t 500 khz. What is the rage f variable capacitr t be used? (A) 5 0 pf (B) 05 pf (C) 9-05 F (D) 0-0 F Give, L 00 H; f = 500 khz-500 khz Frequecy f tued cllectr scillatr is f ; c 4 Lf LC whe f 500kHZ c Whe f 500kHZ 6 0pF c pF 86. The lgical expressi, AB C AB C AB C is equivalet t (A) AB C (B) A B C (C) A B C (D) AC B ABC ABC ABC ABC AB C C ABC AB A BC B A B B C B A C B 87. What is the aalg utput fr a 4-bit R-R ladder DAC whe iput is (000), fr Vref 5V? (A). V (B).4444 V (C).5556 V (D).6667 V V 5 ref Resluti 4 Aalg utput Resluti D where D decimal equivalet f biaryiput vlt. ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 7

18 ESE-06 ESE-07 EE Objective Paper-II 88. Which lgic iputs shuld be give t the iput lies I 0, I, I ad I, if the MUX is t behave as tw iput XNOR gate? (A) 00 (B) 00 (C) 00 (D) X Y F 0 0 I 0 0 I 0 0 I I Furier series f ay peridic sigal x(t) ca be btaied if x t dt. 0. Fiite umber f disctiuities withi fiite time iterval t. Ifiite umber f disctiuities Select the crrect aswer usig the cdes give belw: (A), ad (B) ad ly (C) ad ly (D) ad ly Dirichlet cditis describe the cditis fr the existece f Furier series. Weak Dirichlet cditi:if a sigal is abslutely itegrable ver a perid the Furier series exists. Strg Dirchlet cditi: A sigal must have fiite umber f maxima & miima ad / r fiite umber f I 0 I I I Truth table f XNR 4 t MUX s s x y f disctiuities ver a perid fr the existece f Furier series. 90. Which e f the fllwig statemets is crrect? LTI system is causal (A) If ad ly if its impulse respse is zer fr egative values f. (B) If ad ly if its impulse respse is zer fr psitive values f. (C) If its impulse respse is zer fr egative values f. (D) If its impulse respse is zer fr psitive values f. LTI System is causal if its impulse respse is zer fr egative values f. 9. Csider the fllwig statemets with respect t Discrete Furier Trasfrm (DFT):. It is btaied by perfrmig a samplig perati i the time dmai.. It trasfrms a fiite durati sequece it a discrete frequecy spectrum.. It is btaied by perfrmig a samplig perati i bth time ad frequecy dmais. Which f the abve statemets is/are crrect? (A) ad ly (B) ad ly (C) ly (D) ly DFT is applicable fr discrete-time, peridic sigal whse Spectrum is discrete frequecy ad peridic. Thus, DFT is btaied by perfrmig a samplig perati i bth time ad frequecy dmais. 9. The Laplace trasfrm f the belw fucti is (A) Fs 8s e s 8 s s (B) Fs e ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 8

19 ESE-06 ESE-07 EE Objective Paper-II (C) Fs 8s e s 8 s s (D) Fs e Defie f t 8 u t u t Apply Laplace trasfrm bth sides L ut S S FS 8 e S S By time shiftig Pr perty 8 FS e S S 9. The umber f cmplex additis ad multiplicatis i direct DFT are, respectively (A) N (N ) ad N (B) N (N+) ad N (C) N (N+) ad N (D) N ad N N jk N X K x e ;K 0,,,... N 0 Fr e value f K, N Multiplicatis & (N-) additis are required. K rages frm 0 t (N ) i.e N Values exist fr X[K] thus N multiplicatis & N(N ) additis are required. 94. The Furier trasfrm f a uit rectagular pulse shw i the figure is (A) si (B) si (C) si (D) cs xt 0 t Stad Furier trasfrm f a rectagular pulse is, t F rect sa Fr give x(f), t F si x t rect sa 95. The umber f cmplex additis ad multiplicatis i FFT are, respectively, N (A) lg N ad Nlg N N (B) Nlg N ad lg N N (C) lg N ad lg N N (D) lg N ad lg N I radix- Decimati i time FFT N f N cmplex additis are lg N, ad umber f cmplex multiplicatis are Nlg N. 96. Csider the fllwig drivig pit impedace fuctis: Z Z Z Z s s s s 4 Key: (*) s s s 5 s s 5 s s s s s 4 s s ft Which e f the abve is psitive real? (A) Z (B) Z (C) Z (D) Z 4 8 t ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 9

20 ESE-06 ESE-07 EE Objective Paper-II Ne f the pti is crrect 97. The clsed lp trasfer fucti f a system Cs s is R s s 8s 9s The system is (A) Stable (B) Ustable (C) Cditially stable (D) Critically stable Stable S 8S 9S S 9 N.f R.H.SPle 0 S 8 N.f L.H.SPle S 98 8 S systemisstable 98. A system has 4 ples ad zers i its pelp trasfer fucti. The slpe f its highest frequecy asymptte i its magitude plt is (A) 40 db/dec (B) 40 db/dec (C) + 40 db/dec (D) +40 db/dec At high frequecy asymptte plt Slpe = (4-) (-0 db/dec) = -40 db/dec 99. The pe-lp trasfer fucti fr the Bde s magitude plt is G j H j db 40dV / dec 0 db/ dec 0 db/ dec rad / sec (A) GsHs (B) GsHs (C) GsHs (D) GsHs K s 0.s 0.0s Ks 0.s 0.0s Ks s 5s 50 Iitial slpe = 40 db/dec G s H s K s s 5 s 50 KS S 5S While frmig a Ruth array, the situati f a rw f zers idicates that the system (A) has symmetrically lcated rts (B) is stable (C) is isesitive t variatis i gai (D) has asymmetrically lcated rts Symmetrical lcated rts with respect t rigi. 0. A liear time ivariat ctrl system with usatisfactry steady state errr is t be cmpesated. Which is/are the crrect type f cascade cmpesati t be prvided?. Lead. Lag. Lag-lead Select the crrect aswer usig the cdes give belw: (A) ly (B) ly (C) ly (D), ad 0. A Phase lead etwrk has its trasfer fucti 0.04s GC s. What is the 0.0s ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 0

21 ESE-06 ESE-07 EE Objective Paper-II frequecy at which the maximum phase-lead ccurs? (A) 5 rad/sec (B) 50 rad/sec (C) 75 rad/sec (D) 00 rad/sec 0000 W rad / sec 0. What is the pe-lp trasfer fucti fr the system, whse characteristic equati is F s s s K s 5K 0? (A) GsHs (B) GsHs (C) GsHs (D) GsHs GsHs 0 5K s s s Ks s s s Ks 5 s s s 5K s s s S S K S 5K 0 S S S K S 5 0 G s H s 0 K S 5 0 S(S )(S) G s H s KS 5 S S S 04. I a system, the dampig cefficiet is -. The system respse will be (A) Udamped (B) Oscillatis with decreasig magitude (C) Oscillatis with icreasig magitude (D) Critically damped Oscillati with icreasig magitude 05. A dyamic system is described by the fllwig equatis: 0 0 X X 4 u ad Y = [0 0] u The the trasfer fucti relatig Y ad u is give by (A) (B) (C) (D) Ys 0s u s s 4s Ys 0 u s s 4s Ys s u s s s Ys s u s s s 0 0 A C 0 0 B 4 Trasfer Fucti C SI A B S S 4 S 4S 06. The characteristics f a mde f ctrller are summarized:. If errr is zer, the utput frm the ctrller is zer.. If errr is cstat i time, the utput frm the ctrller is zer. Fr chagig errr i time, the utput frm the ctrller is K % fr every % sec - rate f chage f errr. 4. Fr psitive rate f chage f errr, the utput is als psitive. The mde f ctrller is (A) Itegral ctrller ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

22 ESE-06 ESE-07 EE Objective Paper-II (B) Derivative ctrller (C) Prprtial derivative (D) Prprtial itegral 07. A 000V/400V pwer trasfrmer has a mial shrt circuit vltage V SC =40%. Which e f the fllwig statemets is crrect? (A) A vltage f 400V appears acrss the shrt-circuited secdary termials. (B) A vltage f 6V appears acrss the shrt circuited secdary termials (C) Whe the secdary termials are shrt circuited, the rated curret flws at the primary side at a primary vltage f 400V. (D) The primary vltage drps t 400V, whe the secdary termials are shrt circuited. A 000V/400V trasfrmer has Nmial shrt circuit vltage V SC = 40% 40 VSC H.V.Wdg Vltage V / 400. Beig a temprary remedy whe e trasfrmer frm f Delta-Delta system is damaged, ad remved frm service.. The Vlt Ampere (VA) supplied by each trasfrmer is half f the ttal VA, ad the system is t verladed.. A imprtat precauti is that lad shall be reduced by times i this case. Which f the abve statemets are crrect? (A) ad ly (B) ad ly (C) ad ly (D), ad V V Delta Delta I I I Ope Delta V V I V V VSC 400V S.C.. Ope Delta is a temprary arragemet t have ctiuus supply t a part f the lad.. Lad shared by each trasfrmer is Whe the secdary (400V) is shrt circuited, A 400 V f vltage H.V. side is eugh t drive full lad (Rated) curret. 08. Csider the fllwig statemets regardig three-phase trasfrmers i pe delta ( ) cectis: half f ttallad KVA V I 57.7% KVA V I. OD reducti DD ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

23 ESE-06 ESE-07 EE Objective Paper-II 09. O the Trque/speed curve f a iducti mtr shw i the figure, fur pits f perati are marked as A,B,C ad D. Which e f them represets the perati at a slip greater tha? (A) A (B) B (C) C (D) D A A Trque T B B C C T D Speed V V T N f f T N V 6 T V 76 vlts 4.8 Nm V ph 59.4 vlts NT P Watts E X.5 S 76 Vph f 6Hz S At pit A Rtr rtates i ppsite t R.M.F. Therefre the Relative speed is N N N N N N S r S r S s 0. A -phase, 460V, 6-ple, 60Hz cylidrical rtr sychrus mtr has a sychrus reactace f.5 ad egligible armature resistace. The lad trque, prprtial t the square f the speed, is 98 N.m at 00rpm Uity pwer factr is maitaied by excitati ctrl. Keepig the v/f cstat, the frequecy is reduced t 6Hz. The trque agle is (A) 9.5 (B).5 (C) 5.5 (D) 0 Key: (*) S N 0 r 0 S r S 0 N r D N Brakig Mtrig Geeratig s S S V ji X E 76I cs. Csider the fllwig statemets regardig capability curves f a sychrus geeratr:. The MVA ladig shuld t exceed the geeratr ratig.. The field curret shuld t be allwed t exceed a specified value determied by field heatig.. The MW ladig shuld t exceed the ratig f the prime mver. 4. The lad agle must be mre tha 90. Which f the abve statemets are crrect? (A),, ad 4 (B) ad 4 ly (C), ad ly (D), ad 4 ly ph a s L j.59.5 IL 76 E 59.4 j56.49 E.59Amps E Trque Agle ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia

24 ESE-06 ESE-07 EE Objective Paper-II Frm the pwer curves, we ca say that the sy M/C ca t be laded mre tha the maximum. Field curret shuld be i limits t avid saturati f field. Ay ladig shuld t exceed the supply pit Ratig s (Geeratr, prime mver etc). A -ple, 440V, 50Hz, -phase sychrus mtr takes a lie curret f 00A at 0.8 pf leadig. Neglectig lsses, the trque develped will be (A) 705 Nm (B) 65 Nm (C) 058 Nm (D) 55 Nm NT 050 P N 500rpm P T 65 N m N 500. Csider the fllwig statemets:. Saliet ple alteratrs have small diameters ad large axial legths.. Cylidrical rtr alteratrs have a distributed widig.. Cylidrical rtr alteratrs are wud fr large umber f ples. 4. Saliet ple alteratrs ru at speeds slwer tha cylidrical rtr machies. Which f the abve statemets are crrect? (A) ad ly (B) ad 4 ly (C) ad 4 ly (D) ad ly P max dp d P. Saliet ple rtrs will have larger Diameter & Smaller axial legth.. Cylidrical Rtr hlds distributed widig, whereas saliet ple rtr hlds ccetrated widig.. Cylidrical rtr will pssess less umber f ples sice the diameter f rtr is less, whereas saliet ple rtr psses mre ples sice large diameter. 4. Saliet ple rtrs rus at lw speed because f mre ples ad less much stregth. Whereas cylidrical rtrs ru at high speed because f less ples ad mre much stregth. 4. A permaet maget stepper mtr with 8 ples i statr ad 6 ples i rtr will have a step agle f (A) 7.5 (B) 5 (C) 0 (D) 60 Step agle f stepper mtr 60 N N 60 m.n N.N Where r s r s r m N.f statr phases 8 6 N 60 r N.f Rtr teeth 86 (ples) 60 5 Ns N.f Statr teeth 8 6 ples 5. The trasmissi lie is represeted as a twprt etwrk as shw i the figure. The sedig ed vltage ad curret are expressed i terms f receivig ed vltage ad curret fr the etwrk as V AV BI s R R I CV DI S R R Where A, B, C ad D are geeralized circuit cstats. VS IS A,B,C,D I R VR ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 4

25 ESE-06 ESE-07 EE Objective Paper-II The cditi fr symmetry fr the etwrk is (A) A = C (B) A = D (C) B = C (D) B = D 6. A pwer system has tw sychrus geeratrs havig gverr turbie characteristics as P f P 00 5f Where f represets the system frequecy. Assumig a lssless perati f the cmplete pwer system, what is the system frequecy fr a ttal lad f 800MW? (A) 55.Hz (B) 50Hz (C) 45.Hz (D) 40Hz P 5050f,P 005 f Ttal lad, P 800 Mw P P P f 00 5f f 50000f f 50f f 45.Hz 7. Tw etwrks are cected i cascade i the figure. The equivalet ABCD cstats are btaied fr the cmbied etwrk havig C What is the value f Z? ' Z 500 Z (A) (B) 0.0j (C) -0j (D) ' C0. 90 ABCD f the cascaded etwrk is A B Z 0 C D 0 z C ; Z 0 90 Z C Z j0 8. Which e f the fllwig des t have a effect cra? (A) Spacig betwee cductrs (B) Cductr size (C) Lie vltage (D) Legth f cductr Cra is idepedet legth f cductr 9. Csider the fllwig statemets regardig cra:. It causes radi iterferece.. It atteuates lightig surges.. It causes pwer lss. 4. It is mre prevalet i the middle cductr f a trasmissi lie emplyig flat cductr cfigurati. Which f the abve statemets are crrect? (A), ad ly (B), ad 4 ly (C),, ad 4 (D) ad 4 ly Z The lss frmula cefficiet matrix fr a tw plat system is give by Z ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 5

26 ESE-06 ESE-07 EE Objective Paper-II B M The ecmic schedule fr a certai lad is give as P =50MW ad P =75MW. What is the pealty factr fr plat fr this cditi? (A).4 (B).55 (C).575 (D).7 We have frmula fr Pealty factr L p P lss G P B P B P P P B lss G G G G p P lss G lss G.B P P.B G G G B B Give, B B B P 50 Mw;P 75Mw G susbstitutisall the values, we get p P Pealty factr fr plat L A lssless pwer system has tw geeratrs G ad G ; ad ttal lad t be served is 00MW. The respective cst curves C ad C are defied as C P 0.0P G G C 5P 0.0P G G Assume the miimum ladig ay geeratr t be 0 MW, the mst ecmical lads P G ad P G fr the tw geeratrs are, respectively (A) 70MW ad 00MW (B) 00MW ad 00MW (C) 70MW ad 0MW (D) 00MW ad 0MW Ttal lss = 00 Mw P P 00Mw...() G G C P 0.0P G G C 5P 0.0P G G mst ecmic lad schedulig, dc P G dc P c P G dc 0.0P ; 50.04P G G PG 0.0P 50.04P G G G G 0.0P 0.04P 4 G G G P 4P 400 G P P 00...() Slve & equatis, weget P P 00 G G G P P 00 G P 0 G P 0 G But give that the miimum ladig ay geeratr is t be 0 Mw P shuld be0 Mw G P 70Mwad P 0Mw G. I a -phase ac pwer trasmissi system usig sychrus geerati (A) The steady state pwer limits f bth rud rtr ad saliet ple machies are reached at f their respective pwer agle characteristics. (B) The steady state pwer limit f rud rtr machies ccurs at a much smaller agle as cmpared t that f saliet ple machie pwer agle characteristic. G (C) The steady state pwer limit f saliet ple machies ccurs at smaller agle G ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 6

27 ESE-06 ESE-07 EE Objective Paper-II as cmpared t that f rud rtr machie pwer agle characteristic. (D) The trasiet state pwer limits f sychrus geeratrs d t deped iitial lad just befre the large chage i lad r -phase fault, Steady state pwer limit f rud rtr machie is 90ad fr saliet ple machie is 90. Bulk pwer trasmissi ver lg HVDC lies is preferred because f (A) Lw cst f HVDC termial (B) N harmic lsses (C) Miimum lie pwer lsses (D) Simple prtecti The cst f HVDC system is less cmpared t AC system fr lg trasmissi f bulk pwer. 4. The tur ff time f a thyristr is 0 s at 50 C. What is its tur-ff time at 00 C? (A) 5 s (B) 0 s (C) 60 s t ff If temperature icreases, t liearly. S tff (D) 0 s temperature t ff icreases, but f SCR is mre tha 0 sec, but it is t 4 times at 00 C. S 60 sec is mre suitable t ff at 00 C. 5. The IGBT (Isulated Gate Biplar Trasistr) used i the circuit has the fllwig data: t ON = s, t OFF =. s, Duty cycle (D)=0.7, V CE(sat) =V ad f s =khz. What are the switchig pwer lsses durig tur- ad tur-ff, respectively G (A).98W ad.7 W (B). ad.7w (C).98 W ad 0.79W (D).W ad 0.79W I c V CC V GE V R R L L E CE sat A 0 V I P t.f 6 CC C s 0 I C W 6 VCCIC P ff.t ff.fs 0.79 W 6 6. Csider the fllwig statemets with regard t a GTO :. The tur ff gai f the GTO is large.. Large egative gate curret pulses are required t tur ff the GTO.. GTO has large reverse blckig capability. Which f the abve statemets is/are crrect? VCE 00V ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 7

28 ESE-06 ESE-07 EE Objective Paper-II (A) ly (B) ly (C) ly (D), ad GTO has pr tur ff gai ad large egative gate curret pulses are required t tur ff it. 7. Csider the fllwig statemets with regard t pwer dides:. The breakdw vltage is directly prprtial t the dpig desity f the drift regi.. Lsses i the dide are less due t cductivity mdulati f the drift regi i the state.. The vertically rieted structure supprts large blckig vltages. Which f the abve statemets is/are crrect? (A) ly (B) ly (C) ly (D), ad Pwer dides ad SCRs are mirity carrier devices. I these devices, cductivity mdulati pheme des t exist. Due t this prcess, whe the device eters it cducti state, the ON state lsses are less 8. A three phase fully-ctrlled bridge cverter is cected t a 45V supply, havig a surce resistace f 0. ad iductace f. mh per phase. The cverter is wrkig i the iversi mde at a firig advace agle f 0. What is the average geeratr vltage fr the cditis: dc curret I d = 60 A, thyristr drp =.5V ad f = 50 Hz? (A) 80 V (B) 0 V (C) 0 V (D) 40 V Key: (*) V l Ls cs 80 E I r V I m s t 45 cs50 E E V 9. A large dc mtr is required t ctrl the speed f the blwer frm a -phase ac surce. The suitable ac t dc cverter is, -phase (A) Fully ctrlled bridge cverter (B) Fully ctrlled bridge cverter with freewheelig dide (C) Half ctrlled bridge cverter (D) Cverter pair i sequece ctrl. Fr mtrig perati, half ctrlled bridge is suitable 0. Csider the fllwig statemets:. The vltage develped acrss the OFF switches f the half bridge cverter is the maximum dc lik vltage.. I the full bridge cverter, the vltage acrss the primary f the trasfrmer is the dc lik vltage.. The vltage develped acrss the OFF switches f the full bridge cverter is half the maximum dc lik vltage. Which f the abve statemets are crrect? (A), ad (B) ad ly (C) ad ly (D) ad ly ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 8

29 ESE-06 ESE-07 EE Objective Paper-II Directis: Each f the ext twety (0) items csists f tw statemets, e labelled as Statemet (I) ad the ther as Statemet (II). Examie these tw statemets carefully ad select the aswers t these items usig the cdes give belw: Cdes: (A) Bth statemet (I) ad statemet (II) are idividually true ad Statemet (II) is the crrect explaati f Statemet (I) (B) Bth statemet (I) ad statemet (II) are idividually true but statemet (II) is t the crrect explaati f statemet (I) (C) Statemet (I) is true but statemet (II) is false. (D) Statemet (I) is false but statemet (II) is true. Statemet (I): A supercductr is a perfect diamagetic material. Statemet (II): A supercductr is a perfect cductr.. Statemet (I): Limitig factr f DC trasmissi is the high cst f cversi equipmet. Statemet (II): Geerati f harmics is used fr reactive pwer trasfer ly which has the ability t alter vltage levels.. Statemet (I): A lattice defect gets created wheever the peridicity r rder f the crystal lattice gets disturbed. Statemet (II): Pit defect, lie defect, surface defect ad vlume defect create defect i lattice. 4. Statemet (I): T measure pwer csumed by the lad, it is ecessary t iterchage the pressure cil termials whe the piter f a wattmeter kicks back. Statemet (II):The pressure cil termials are iterchaged t get upscale readig i a wattmeter withut affectig the ctiuity f pwer t the lad. I tw watt meter methd, the readigs f tw wattmeter are L L L L W V I cs 0 W V I cs 0 If lad pwer factr is less tha 0.5, 60,W shws egative readig. T get crrect readig watt meter pressure cil termials are t be iterchaged. 5. Statemet (I): A istrumet maufactured as a ammeter shuld t be used as a vltmeter. Statemet (II): The high resistace widig f a ammeter will suffer serius damage if cected acrss a high vltage surce. Ammeter ca t be used as a vltmeter because ammeter has lw resistace. Whe Ammeter cected i parallel, it draws high curret due t its lw resistace. 6. Statemet (I): Mvig ir istrumets are used i ac circuits ly. Statemet (II): The deflectig trque i mvig ir istrumets depeds the square f the curret. MI ca be used fr bth AC ad DC measuremets, but with DC accuracy is lw. dl Td I, TdI d 7. Statemet (I): PMMC istrumets are suitable i aircraft ad air space applicatis. ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 9

30 ESE-06 ESE-07 EE Objective Paper-II Statemet (II): PMMC istrumets use a cre maget which pssesses self shieldig prperty. PMMC Meter uses a permaet maget. Fr permaet maget peratig magetic field is very strg ad exteral stray fields have little effects. 8. Statemet (I): A ballistic galvameter is preferred as a detectr i a AC bridge t measure iductace supplied by a surce at pwer frequecy. Statemet (II): A AC bridge t measure iductace is balaced at the fudametal cmpet. Vibrati galvameters are used as a detectr i a AC bridges fr pwer & lw audi frequecy rages. The effective iductace ad resistace vary with frequecy s that a bridge balaced at fudametal frequecy is ever truly balaced fr harmics. 9. Statemet (I): Phase lag etwrk is used t icrease stability as well as badwidth f the system. Statemet (II): Phase lead etwrk icreases badwidth f the system. 40. Statemet (I): The iductr is t used t fabricate a lag etwrk as it prduces time delay ad hysteresis lss. Statemet (II): A capacitr cat be used t fabricate a lag etwrk. 4. Statemet (I): Rts f clsed lp ctrl systems ca be btaied frm the bde plt. Statemet (II): Nyquist criteri des t give direct value f crer frequecies. 4. Statemet (I): The IGBT makes use f the advatages f bth pwers MOSFET ad BJT. Statemet (II): The IGBT has MOS iput characteristic ad biplar utput characteristic. MOSFET has less switchig time ad BJT has lw cducti lss. IGBT resembles MOSFET iput side ad BJT utput side. 4. Statemet (I): The pwer distributi systems are -phase 4 wire circuits. Statemet (II): A eutral wire is ecessary t supply sigle phase lads f dmestic ad margial cmmercial csumers. 44. Statemet (I): The maximum trque f a iducti mtr is idepedet f rtr resistace. Statemet (II): The slip at which the maximum trque ccurs is directly prprtial t rtr resistace. 45. Statemet (I): A -phase iducti mtr is a self startig machie. Statemet (II): A star delta starter is used t prduce startig trque fr the iducti mtr. 46. Statemet (I): Leakage reactace f the lwer cage i a duble squirrel cage mtr is csiderably higher tha that f the upper cage. Statemet (II): The lwer cage has high permeace fr leakage flux. 47. Statemet (I): Supercductig cmpuds ad allys must have cmpets which are themselves supercductig. ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia 0

31 ESE-06 ESE-07 EE Objective Paper-II Statemet (II): Metals ad cmpuds which are supercductig are rather bad cductrs at rdiary temperatures. 48. Statemet (I): The relative dielectric cstat f a isulatr decreases with icrease i the frequecy f the applied alteratig field. Statemet (II): With icrease i frequecy f the applied field, plarizati prcess icreases. 49. Statemet (I): Oe series RC circuit ad the ther series RL circuit are cected i parallel acrss a ac supply. The circuit exhibits tw resaces whe L is variable. Statemet (II): The circuit has tw values f L fr which the imagiary part f the iput admittace f the circuit is zer. 50. Statemet (I): The pwer available frm wid is directly prprtial t V, where V is the velcity. Statemet (II): Drag type wid turbies have lwer speeds ad high trque capabilities. Frm wid pwer equati K.C p.a.v S, wid pwer is directly prprtial t velcity V ad drag type wid turbies have lwer speeds ad high trque capabilities. ICP Itesive Classrm Prgram IES-Live Iteret Based Classes DLP All Idia IES-Test Series Leaders i IES Preparati 65+ Ceters acrss Idia