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ELECTRONICS & TELECOMMUNICATION ENGINEERING
IES PAPER-I (2001)b. 30n and SQc. ISO and 30nd. 200 and 350Fo r
the circuit shown in the given. figure,when the switch is at
pesitlen A ., thecurrent i(t) = Isin (rot + 300) A. Whenswitehss
moved to position B at rime t =0,the power dissipated at the
switchinginstant in the resistor R remains-unchanged
. { f a : ; . Q $1.
Which one of the following parametersdoes. not exist fo r the
two-port networkshown in the given figure?a . ABeDh. yc. hd. Z2
.
z-matrix for the network shown In thegiven f igur e isa. [2S+ 1
2S3 ]2 . 1 " 2 s+- s
-28 j328+-sc. [ 2 . 1 ' + I +25 1
-2s 2 .1 '+3/ s
d. [2S+~ -2s 12s 2 2 s +3/ s
3.
Fo r the equivalent )..".1 circuit shown in thegiven figure, the
values of R.O\B and R rw arcrespectivelya . SO and Isn
4.
The value of I and th e element X wouldrespectively, Dea . 1 A
and resistorh. 2 A and capacitorc. 3 . A and resistord. 4 A and
capacitor
5.
~,."~"L~6.
In the circuit shown in the given figure, thevalues of i (O+)
and l(co) will be,respectivelyIn the circuit shown ill the given
figure,C 1 =C 2 = 2 F and the capacitor C 1 has avoltage of20 V
when S is open.
~Irf' C ' I 1 :It the switch S is closed at t =0 the voltageVc
will be aa > Fixed voltage of 20 Vb. fixed voltage 0 f l 0 Vc.
fixed voltage of -10 V
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E N G I N E E R S I N S T I T U T E O F I N D I Ad . sinu so id
al v olta geThe circuit shown in the given figure is inthe steady
sta te w ith the sw itch S closed
20
2b. a high-pass filterc. an a ll - p as s filte rd, a ba nd - pa
ss filter
12. ' If a function J ( t ) u ( t ) is shifted to rig htside by
to , then the fuH CfiQn can beexpressed a sa. J ( t - t o ) u ( t
)b. J { t ) u ( t - t ( ) )c. J ( t - t o ) u (t- t G Jd. f ( t + t
g ) u ( t + t Q )The dual of a pa ra llel R - C cirouit is aa .
geri:es R - C circlrit
13.
14 :
b. Series R_~ Lcireaitc, Pa ra llel R - Ccireuitd. Pa ra llel R
- Lcircuit. . . S ( S 1 + I )'ID n v tQ g p pm t Impedance Z ( s )
= 0 4s : +
20
is n : @ t realizable b ec au se th ea . num ber of z eros is
more 'than the
number o f p ole sb. poles a nd z eros lie on the imaginary
aXISc .. poles and zeros do not alternate on.. .nnagmary ax!d.
poles and zer s a re no t located on th e
rea l a xis15 , The f un ct io n s + 2 + ~ c an b e re aliz e
ds
16 ,
a . both as a driving point im pedance anda s a driving point
admi t tance
h. a s an im pedance, bu t no t a s anadmi t tance
c. a s an adm ittance, but not a s animpedance neither
d. as an impedance nor a s a n a dm i tta nc e?s+5 .
If F { s ) = = = , - ' . , then f ( l ) IS givens: + 5s + 6b ya.
e -c.s. [cosh 0 . 5 1 + sinh 0 . 5 f ]b. e:" [cosh 0.5 t + sinh 0.5
/]c. J 2 e " c . 5 1 sin(O.5t+4SO)d. e:" {cosO.5l+sinO.5t}If R , L.
C and G are th e resistance,inductance, ca pa cita nce a nd
conductanceo r a tra nsm ission line respectively, then
~ ~_l_H _ J T t FThe current 1 (t) a fter S is opened a t t= 0
is
8 .
a. a dec rea sing exponen ti alb. an increasing exponentialc. a
d amp e d s in us oidd. oscillatoryA resistor R of 1 Q and two
inductors Lland L 2 of inductances 1B and 2H ,respectively, are
connected i n p a ra lle l. Atsom e tim e, the currents through
LIand L 2are IA and 2A , respectively. Th e currentthrough R at t
ime t=w ill be
17.
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a. zerob. lAc. 2Ad. 3AA u nit s te p c urr en t is a pp lie d to
a netwcrkconsisting of only passive elem ents. Thevoltage across
the current seurce observedis v( t) :: : (1 + e- t!}T he s im p le
st p ossib lenetwork will consist of the e l e m e n t sa . 1
resistor a nd 2 c apa cito rsb. 1 resistor and 2 ii1ductorsc. 2 r
es is to rs a nd r capacitord. 2 resistors and 1 inductor.
10. If the numerator of a second -order transferfunctionF(s)a
consta nt, then the filter is a
9 .
isa . band - p a ss f il te rb, band - stop filterc. high - pa
ss f il te rd. low - pass filter11 .
The pole-z ero pa tterns shown in the givenfigure is fora . a
low - pass filter
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E N G I N E E R S I N S T I T U T E O F I N D I A
18.
the condition for distortion lesstransmission line isa.
RlC=GLLh. RC=LGc. R2C= 02Ld. RC:l= OL
2
18. The energy stored per unit volume inan electric field (with
usual notations) ISgiven bya. 1 /2 SH2b. 1I2 sEc. 1 /2 SE2d. EE2A
positive charge of Q coulombs is locatedat point A(O, 0, 3) and, a
negative chargeof magnitude Q coulombs is located atpoint B(O, 0,
3). The electric fieldintensity at point C(4 , 0., 0) is in the3.
negative x-directionb. negative z-directionc. positive
x-directiond. positive z-direction
19.
20. v= 12 ( r 8 V )+ _ ! _ (2 ! V )+ 8 ' 2 V = 0r c r c r , r:'
a7' az l
, . O lV a~ v a 2vh. ~lV= __ +_-+--.. oxJ 0t~ 8z~G. \:v~p
....1 Io ( r ! 6 V i l r t . (.IiTI.d ; . . . . : - -
--)+---1Slrl"riir o r l "sinODO, I '; () . .I r : V+ -.-.- --. -
0r'sin o tV)
Gauss law relates the electric fieldintensity E with the volume
chargedensity p at a p oint as_...a. vxR=snP
2 5 .
b. \l.E = 8'oPc. \I x 1 ; = pi fl'ld. 'VeE -=;" ,p!E:,The input
rirnpedance of i..g Inng short-circuited section of a Jossless
transmissionline is
26.
a. zerob. inductivec. capacmvcd. infiniteMatch List I
(Parameters) with List II(Values) for a transmission line with
aseries impedance Z = R + j c t } 1 . n:'rn and ashunt admittance Y
= G + jC'l C mho/rn.and select the correct answer:List IA.
Characteristic impedance LoB . Propaga tion constant yC. The
sending-end input impedance Zu
when the line is terminated III itscharacteristic impedance
Z"
list 11I. ,fX Y
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E N G I N E E R S I N S T I T U T E O F I N D I A
C1322
A boundary separates two magneticmaterials of permeability 1 - 1
1 and f J . 2 . Themagnetic field vector in 1 - 1 1 is HI with
anormal component HUl and tangentialcomponent Ht, while that in 1 -
1 2 is H 2 witha normal component Hn2, and a tangentialcomponent
Ht2. Then the derivedconditions would bea . HI =H~ and H,,= H"b. H
= Hand f1 H = If .H'1 2 .] III 1"""'2 n~
2. .jZ/Y3. .jY/ZCodes;
A Ba . 3 Ib. 2 3c. 2 1d. 1 2
2 7,
32 . .
d .For frequencies up to 16~Otransmitting antenna used is aa.
Parabolic dishb. Vertical antennac. Yagi antennad. Turnstile
antennaThe radiation field of an antenna at adistance r varies as3.
Ill'b. 1Ir2c. l/ r 3d. llr4The wave radiate by a helicalantenna
isa. Linearly polarizedh. 'Right circularly polarizedc.
Lefbeircularly polarized(L Elliptically polarizedWbich one of the
following IS NOT acorrect Maxwell equation?
~ aD -a. Vxil=-+Ja t- aHb. \lxE=~' ~a l
28.
29.
30.
31.
c. V.D =Pd. VB =0
4In a certain micro strip path antenna, theunexcited patch is of
length L, width W,thickness of the substrate being h and
itsrelative permittrvrty e, Then, thecapacitance of the
unexoft~~.'b~atch isa . LW/ shb. LW / oc,hc. E : LW I hrd. f :o
&/ ,LW I hMatch List I (Msxwell equa:tiion9 witih ListII
(Description) and select the correctanswenList IA. c f i d Z i = 0B
4 D da =1pd'Vc. c f1 .d ~ =-qB.daD. ~.H.d; =4 (D + J ) .datistU1.
The mmf around a closed path is equal
to the- conduction current plus the timederivsnve of the
electric displacementcurrent through any surface boundedby the
patm.
2. The emf around a closed path is equalto the time derivative
of the magnetic
---'------'''J-Jisplacement through any surfacebounded by the
path
3. TIle total electric displacement throughthe surface enclosing
a volume is equalto the total charge within the volume
4. The net magnetic flux emergingthrough any closed surface is
zero
Codes;ABC D
4
33.
a. 3 2b. 4 3 2c. 4 2 3d. I 2 3
34. In a uniform plane waveI E I / I H I isa. ~p/&b. ~E/ j.
1c. Id. j;;
14the value of
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E N G I N E E R S I N S T I T U T E O F I N D I A35. For a
hollow waveguide, the axial current
must necessarily bea. a combination of conduction and
displacement currentsb. conduction current onlyc. time - varying
conduction current anddisplacement currentd. displacement current
onlyA cylindrical cavity resonates at 9 GHz inthe Till mode. The
bandwidth 3 dB ismeasured to be 2.4 MHz. The Q of thecavity at 9
GHz isa. 9000/2.4J3b. 9000/2.4 J2c. 9000 x 2.4 J3/.J2d. 9000/2.4The
phenomenon of microwave signalsfollowing the curvature of earth is
knownas
36.
37.
38.
a. Faraday effectb. ductingc. wave tiItd. troposcatterA. radio
communication fink is to beestablished via the ionosphere. The
virtualheight at the mid-point elf the path is 300krn and the
critical frequency is 9 MHz.The maximum usable frequency Io,r
thelink between the stations of distance 800km assuming flat earth.
isd. 11.25 MHzb. 12 MHzc. 15l\1Hzd . 25.5 MHzWhich one of the
following statements isNOT correct for a plane wave withif
::::::.5e-1)I., cos (106{- 2x) G o A / ma. The wave frequency is
106 r.p.s.b. The wavelength is 3.14 mc. The wave travels along -l-
x-directiond. The Wave is polarized in the z-
directionA coil. of resistance of 5 Q and inductance0.4 H is
connected to a S O V d.c. supply.The energy stored in the field
is
39.
40.
< . I . 10 Joulesb. 20 _joulesc. 40 _lou lcs
4L
42.
43.
44.
45.
46.
5d. 80joulesThe resistivity of the wire material can beexpressed
in terms of LMTI system ofdimensional parameter asa. A 1 L " t:r"b.
ML2r'rc. /vfL3T-3r"d. /IIiLorc r'A 0 - 150 V voltmeter has an
accuracy of1% of full-scale reading, The voltagemeasured by the
instrumeritis 7S v. Thelimiting error is3. 1%b. 2%c. 2.5%d. 3%Which
one of the following is the bestdefinition of accuracy?a. It is the
measure of consistency or
reproducibility of measurementsb. it is the ratio of the change
in output
signal to the change in input signalc. It is the -smallest
change in measurable
inpntd. It is the closeness with which an
instrumerit reading approaches the truevalue of t]le quantity
being measured
\~(hilc measuring the phase differenc ebetween the signals VI(t)
= 10 sin i t andv= ( t) = I(}in (cot + ~), the Lissajouspattern
observed on eRO was a circle. Thevalue of ~ is
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E N G I N E E R S I N S T I T U T E O F I N D I A
49.
~~~~~~~~dmvThe reading of high impedance voltmeterV in the
bridge circuit shown in the givenfigure isa. zerob. 3.33 Vc. 4.20
Vd, 6.66 V
47. Digital measuring instruments use thefollowing three types
of A to D convertersr Dual Slope Type2. Counter Type3. Flash
TypeThe correct sequence forthe~e convertersin decreasing order of
their speed (fastestto slowest) is< . I . 3, 1,2b. I, 2, 3e. 2.
3, 1d. 3, ') 1
48. Consider the following statcmenlsregarding the advantages
ef, Andersonbridge:1. It is th e modification of the Maxwell's
inductance-capacitance bridge.2. For measuring the low Q of
coils, it is
superior to th e Maxwell's bridge.3. It is simple compared to
Maxwell's
bridge.4 . H can be used to determine mutua l
inductance alsoWhich of these statements are correct?a. 1,2 and
3b. 1, 2 and 4c. 2 and 4d. 1,3 and 4Match List I (Bridges) with
List JI(Quantities) and select (he correct answerList IA. Maxwell s
bridgeB. '0./ icn bridgeC Hays bridge
6D. Schering bridgeList n1. Frequency2, Inductance with value
ofQ
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E N G I N E E R S I N S T I T U T E O F I N D I AD.
DiaphragmList II1. Pressure2. Torque3. Displacement4.
TemperatureCodes;
A B C 0a. 2 4 3 1b. 3 2 4c. 2 1 3 4d. 3 4 2
53. Gauge factor of a strain gauge is definedas the ratio of a
per unit change in thea. conductivity to the per unit change in
applied force acting on the elementb. resistance to the per unit
change in the
length of the elementc. stress to the per unitdiange in stnlin
of
the elementd. current to the per unit change in the
length of the elementA variable reluctance type tachometer has60
rotor teeth, the records 3600counts/minutes. The device speed isa.
60 r.p.s.
54.
b. 1800 r.p.s.c. 3600 r.p.s.d. 7200 r.p.s.
55. Hot wire anemometer is a device used tomeasure the
56.
a. pressure 10 gasesb. liquid dischargec. gas velocitiesd.
temperatureConsider the following devices1. Anemometer2.
Stroboscope3. AccelerometerThe correct sequence of these devices
tomeasure the rotational speed, vibration andairflow, respectively
is,a . 2, 3 and 1b. 2, 1 and 3c. 1,3 and 2d. 3,2 and]The pH value
of a solution is defined asa. - log (He on concentration)b. log (H'
ion concentration)
57.
7
58.c. - log" / (011ion concentration)d. -log (011ion
concentration)The piezoelectric crystal voltagesensitivity is
defined as aa. voltage developed per U : J 1 1 t stressb. field
developed perunftstressc. voltage developOOperunit forced. field
developed'perunitfcrceThe bandwidth of an n.bit binary codedrCM
signal for an original signalbandwidth of B Hz'isa . BHzb. nB
Hz
Bc.~Rznd. n2BHzFor an AM wave, the maximum voltagewa s found to
be 10 V and the minimumyo1tas:e was found to be 5 V. Themodulation
index of the wave would be
59.
60.
a . 0.33b. 0.52c. 0040d. I D . l
67
The FM telemetry as compared with AMte1emetitYrequires a channel
that isa. equal to that of AM telemetryb. smaller than what is.
required for AM
telemetryc. 100 times of. that required for AM
telemetryO. 10 times of that required for AM
telemetryAs the Fermi energy of silver is 8.8 x 10-1 9joule, the
velocity of the fastest electron insilver at 0 K (Given: Rest mass
of electron= 9.1 x 10.3 1 kg) isa. 3.33 x lO 5 rnIsb. 1.39 x 106 m
/sc. 4.40 x 107 m/sd. 3xl0~rnIsA four-point probe method is used
toevaluate the sheet resistance of asemiconductor epitaxial layer.
If a probecurrent of 10 mA produces a voltage dropof 0.22 V between
the inner probes, then.the sheet resistance of the layer isa 100
D./squareb. :2] 5 D./square
63.
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8/2/2019 PDF IES Electrical Objective 2001 I
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E N G I N E E R S I N S T I T I J T E O F I N D I Ac. 572
Q/squared. 1000 Q/square
64. For which of the followingsemiconductors, resistance does
not followOhm's law over some specific range of theapplied
voltage?1. Germanium2. Gallium arsenide3. Iridium phosphideSelect
the correct answer using the codesgiven below:a. 1,2 and 3b .. 1
and 2c. 2 and 3d. 1 and 3Electron mobility and life-time In
asemiconductor at room temperature arerespectively 0.36 m2 /(V s)
and 340 I - L S . Thediffusion length isa. 3.13 mmb. 1.77 m mc.
3.55 mmd. 3.13 emA piezoelectric crystal pas Young'smodulus of 130
OPa. 'F.he UNiaxial stressthat must be applied to increase
itspolarization from 550 to; 555 C m2 is,nearlya. 2.798 GPab. 2.175
GPac. ] .593 OPad. 1.1820Pa
67. The outermost electronic configuration ofa cobalt atom is
3d24s1 Its magnetic
65.
66.
6S.
moment isa. 9 Bohr magnetonsb. 7 Bohr magnetonsc. 5 Bohr
magnetonsd. 3 Bohr magnetonsMatch list 1 with List II and select
thecorrect answerList I (Applications)A. Permanent magnetsB. High
frequency (MHz) applicationsC. ElectromagnetsD. Very high
frequency(GHz)applicationsList II (Magnetic materials)1. Ferrites2.
Hard magnetic material
83. Garnets4. Soft magnetic materialsCodes;
A B C Da. 1 2 4 3b. 2 1 3 4c. 2 1 4 3d. 2 3 4
69. Match list Iwith list IIand select thecorrect answer:A.
Ferro-magnetismB. SemiconductorC. OptIcal property of solid. I D ,
Sl!p.eIeonductivityUstIL1. d,c. electrical-resistivity vanishes at
the
critical temperature Tc2. Doping with impurity increases the
electrical conductivity3. An intemal molecular field BI\I
which
I S proportianal to magnetization Mexists at each dipole ar
"igns itparallel to other dipoles
4. Above the Neel temperature thedipoles beceme randomly
oriented
5 " The conductivity of crystallinesemiconduetors and
dielectricsincreased bv radiation incident
C0dc,S,;A B C D
a. 3 5 : 2 Ib. 3 2 5c. 4 5 2 3d. 4 2 5 3
70. Consider the following statements:The dielectric constant of
an insulatordepends onI. applied voltage2. frequency of the
alternating field
applied.3. temperature4. maximum current density in
insulator.Select the correct answer using the codesgiven below:a. 1
and 2b. 1 and 3c. 2 and 3d. 3 and 4
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E N G I N E E R S I N S T I T U T E O F I N D I A71. Which of
the following statements are
correct for ceramic materials?1. They are inorganic substances.2
. They are brittle.3. They are good thermal insulators.Select the
correct answer using the codesgiven below:a. 1,2 and 3b. 1 and 2c.
2 and 3d. I and 3Laser emission from Ruby crystal isbecause 0f
transi tiona, from conduction band to valence bandAb03
b. from conduction band to one of thelevels due to Cr ionsc.
between energy levels introduced byCr ions
d. between one of the levels due to Gr ionand valence band of
Ab03
Wire-wound resistances are used onlywhena. Precision is
essentialb. low values are requiredc. high power rating is
necessaryd. costly equipments are manufacturedConsider the
following statements:In a transformer, the core material shouldhave
low1. coercivity2 .. retentivity3 .. permeabilityWhich of these
statements are correct?
72.
73.
74.
a. 1 and 2b. Land 3c. 1 and 3d. 1,2 and 375. Consider the
following statements:Impurity diffusion is used insemiconductor to
control the conductivity.The nature of the impurity profile
shouldhe such that the1. Impurity concentration decreases with
diffusion depth.2. Profile results in an internal electric
field.
9
76.
3. Impurity concentration ishomogeneous with no internal
electricfield.
4. Which of these statements are correct?a. 1,2 and 3b. 1 and
3c. 2 and 3d. 1 and2An one - sided abrup:rjtiheticJp. has lQ21perm3
of dopants on the lightly doped side,zero bias voltage and a buitt-
in potentialof 0.2 V. The depletion width ofthe abrupt. tio: (taki
1 6 X lrrf9 C - 16unc Ion aJ:ldngq = . ,..:1) .. , 1:0 - ..and EO ~
8.875 x 1O,n F7m) isa. O.036nmh.O.6I1mc, 3!.lmd. 1.5 rnmWhich of
the following statements relateto the Hall effect?r. A potentIa1
difference is developed
across a current-carrying metal stripwhen the strip is placed in
a transversemagnetic field.
2, The Hall elect is very weak in metalsbut is large in
semiconductors.
.3. The Hall effect is very weak insemiconductors but is large
in metals.1 : 1 . it is applied in the measurement of themagnetic
field intensity.
a. 1. 2 and 3b. 2 and 4c. 1,3 and 4d. 1,2 and 4The output
current Versus input voltagetransfer characteristic of an
n-channelJFET is such that there isa. zero current flow t zero
input voltage
biasb. current flow only when a positive input
threshold voltage is crossedc. current flow only when a
negative
input cut-off voltage bias is crossedd. no cut-off input
voltageAn. SCR triggered by a current pulsethrough its gate can be
turned off bya. giving another pulse of the same
polarity to the. gateb. by giying pulse to the cathodec. by
giving pulse to the anode
77.
78.
79.
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E N G I N E E R S I N S T I T U T E O F I N D I A
80.
d. by reversing the polarity of anode andcathode voltage
Inan MOS transistor, the gate source inputimpedance is1 . lower
than the input impedance of a
BJT2. higher than the input impedance of a
BIT3. lower than the input impedance of a
IFET4. higher than the input impedance of a
JFETa. 1 aloneb. 2 and 3c. 4 aloned. 2 and 4At 25C, the
collector-emitter voltage dropof a silicon transistor at saturation
isapproximatelya. 0.1 V
81.
b. 0. .3 Vc. 0.5 Vd. O.7V
82. The reverse bias breakdown ofhgll speoosilicon transistors
is due toa. avalanche breakdown mechanism at
both the junctionsb .. Zener breakdown mechanism at .boththe
junctionsc. Zener breakdown mechanism at l:5ase-
collector junction and avalanchebreakdown mechanism at
base-emitterjunction
d. Zener breakdown mechanism at base-emitter junction and
avalanchebreakdown mechanism at base-collector junction
In the fabrication of a buried layer n-p-ntransistor, the
processes involved are1. diffusion2. oxidation3.epi'taxy4.
lith(\}grapllyThe correct sequence III which theseprocesses are to
be carried out, isa. 2,4,3,1
83.
b. 4,2,1,3c. 2,4, 1,3d. 4,2,3, 1
1084. Match List I (Operating point on the I-V
characteristic) with List II(Devices) andselect the correct
answer:List IA 1st quadrantB. 2nd quadrantC. 3rd quadrantD. 4th
quadrantList II1. Solar cell2. Photo detector withthigh
sens:iti\itty3. Phsto detector with l@w se:rn.sftikvity4 . ~ e(i}
1!H ierdiodeCod.
A c D1. 4
~ 3c. sIi 4
344
22
23 2
j. . .Af'.:sertltm (A): A C IrC U It conta m m greaetanees is
said to be in resonance if the,@ltageacross the circuit is in phase
withthe current through it.B:easmcn ER ) : At resonance, the
powerf{l:e;torof tlie c' rcuir s zero.a. Both A and R are true and
R is the
correc explanation of Ab. Both A and R are true but R is
NOT--1lle correct explanation of Ac. A is true but R is falsed. A
is false but R is trueAssertion (A): Programmes broadcast byradio
stations operating in the mediumwave band of 550 to 1650 kHz
situated atlong distances in excess of 500 krn cannotbe heard
during day-time but may be heardduring night-time.Reason (R): In
the night-time, radio wavesreflected from the F -layer suffer
negligibleattenuation since D- and E-Iayers areabsent during the
night-time.a. Both A and R are true and R is the
correct explanation of Ab. Both A and R are true but R is
NOT
the correct explanation of Ac. A is true but. R is falsed. Ais
false but R is true
87. Assertion (A): For an end-fire array, thecurrent in
successive antennas must lag inphase.
86.
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88.
89.
90.
91.
E N G I N E E R S I N S T I T U T E O F I N D I AReason (R):
Radiation of successiveantennas willa. Both A and R are true and R
is the
correct explanation of Ab. Both A and R are true but R is
NOT
the correct explanation of Ac. A is truebut R is falsed. A is
false but R is trueAssertion (A): The radio horizon for spacewave
is more than the optical horizon.Reason(R).: The atmosphere has
varyingdensitya. Both A and R are true and R is the
correct explanation of Ab. Both A and R are hue but R is NOT
the correct explanation of Ac. A is true but R is falsed. A is
false but R is trueAssertion (A).: Any indicating instnsmentshould
have a damping torque.Reason (R): Without a damping torque,
i'Jilepointer takes more settling time.a. Both A and R are v =
andcR is: the
correct explanation of Ab. Both A and Rare tme ,blWR is NOT
the correct explanation of A -c. A is true but R is falsed. A is
false but R is trueAssertion (A): Potentiometric typeaccelerometers
have higherresolution tllanLVDT accelerometer.Reason (R): The
resistance offered to themotion is less inL VDT accelerometersthan
in Potentiometric accelerometer.a. Both A and Rare true and R is
the
correct explanation of Ab. Both A and R are true but R is
NOT
the correct explanation of Ac. A is true but R is false( 1 , . A
is faIs but R is trueA~Sel1ion fA): 1n superconducting state,bath.
entropy and thermal conductivitydecrease.Reason (R):
Superconductivity resultsbasicatlydue to zero atomic vibration
ofcrystal 'structure.a. Both A and R are true and R is the
correct explanation of Ab. Both A and R are true but R is
NOT
the correct explanation of A
92.
11
93.
c. A is true but R is falsed. A is false but R is trueAssertion
(A): Copper as an impurity ingermanium has an ionizseen energy
of0.25 eV whereas Boren kls ionizationenergy of 0.01 eV.Reason (R):
Copper .is an interstitialimpurity whereas RfallOllis a
suhsMllltionalimpurity,a. Both A and R ase tffle and R is the
correct explana.l!ion of Ab. Both A and 1 lt are true bnt R is
NOT
the-coaect exp1anation of Ac. A is'true 'fuutR 1 S false.t : i .
A 1B flisebut R is weAsser{1en (~~: "Ebesemieenductor
deviceslike)3:J{}'lshase a maximum temperature
ofQ[l.leraXion"belji!1md which they do nofuaeti O J 1 LRieasln ")'~
Extrinsic, p-type and n-typesfmieemrs. behave as intrinsic
beyondthat temperaifure and the effect of doping islost. 'a. Beth A
and R are true and R is the
eEl;Tfeetxplanation of Ab. Bo.th A and Rare true but R is
NOT
the et}n:ect explanation of Ac. A is t r t r G : but R is
falsed. A is false but R is trueFhe discfete time system described
by yen)=x(n2) isa. causal, linear and time-varyingh. causal,
non-linear and time-varyingc. non-causal, linear and
time-invariantd. non-causal, non-linear and time-variantWhich one
of the following transferfunctions does correspond to a non-minimum
phase system?
94.
95.
sa. s " 2 + 2 s + 1s+1b. -?~~-s: + 2s +1s+1c. S2 +2s-1s-I
96..d. i+ 2s+ 1The signal x(t)=Acos(rv'/+) isa. an energy
signalb. a power signal
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8/2/2019 PDF IES Electrical Objective 2001 I
12/14
E N G I N E E R S I N S T I T U T E O F I N D I A
97.c. an energy as well as a power signald . neither an energy
nor a power signalWhich one of the following digital filtersdoes
have a linear phase response?a. yen) + yen - 1)=x(n) - x(n - 1)b.
yen) =1/6 [3x(n) + 2x(n - 1) + x(n - 2)]c. yen) = 1/6 [x(n) + 2x(n
- 1) + 3x(n - 2)]d. y(n) = 1/4 [x(n) + 2x(n - 1) + x(n - 2)]For the
system described by X = AXmatch List I (Matrix A) with List
II(Position of eigenvalues) and select thecorrect answers:List
I
98.
[ - 1 2 ]. o -2[ - 1 - 2 ]. - 2 - 4
C. [ ~ ~ 1 ]D. [ ~ ~]List II1 . One eigenvalue at the origin2.
Both the eigenvalues in the LHP3. Both the eigenvalues in RHP4.
Both the eigenvalues on the imaginary
axisCodes;
A B C Da. 2 1 3 4b. 2 1 4 3c. 1 2 4 3d . 1 2 3 4
99. For the system dynamics described bydifferential equation y
+ 3y + 2y = u(t) thetransfer function of the system representedin
controllable canonical form IScrsl- AT! B. The matric A would bea.
[ ~ 3 ~ 2 ]b. [~:]
c. [ ~ 2 ~ 3 ]d. [~ ~]
100.
12
lO L
If XI ( t) = 2 sin n:t + co s4n: t andx " ( t ) =sin5m +3sin 13m
, thena. x, and X :z both are periodicb. xi and X2 both are not
periodicC. x, is periodic, but X2 is not periodicd. x, is not
periodic, but x- is periodicThe Fourier transform of a
double-sidedexponential signal x( t ) =e- b ! ' 1a. is 2b / (b2 + m
2 )
(lif':fi')e-j-tallb. , Z i ? + u P )c. does not existd. exists
only when itis single sided102. The Faariertransform ofii(t) isa.
l!jroh. J c oc. 1/(1 +jro)d. n:o( c o ) + l/j(O
1113. Match List Ith LIst II and select thecorrect answer;List
IA.. e-QS]3,J-s
l+s
List II1. All-pass filter2. Transport delay3. Lag network4.
ServomotorCodes;
A B C Da. 4 3 1 2b. ') 1 3 4c. 2 3 1 4d . 4 ] 3 2
104. A linear network has the system function( s + c)
H-c------'----'--------c-( s + a ) ( s + h )The outputs of the
network with zeroinitial conditions for .1\\'0 different inputsare
tabled as
Input x(t) Output yet)u(t) 2 + De" + Ee-3
