JPSC Assistant Engineer 2021: Assistant Engineer Written Exam, Advt. No. 08/2018 and 08/2019, ELECTRICAL ENGINEERING PAPER-1 SUBJECT-CODE-06
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Boffies AEUD
Booklet No.
QUESTION BOOKLET 790 58 9
ELE CTRICAL ENGINEERING
PAPER - I (06)
TimeAIlowed : 2 Hours Maximum Marks : 200
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A series R-L-C circuit is switched on
1. The time coustant of the circuit shown
with a step voltage V at t = 0 see. What
below is are the initial and final values of cum
in the cirouit ?
(A, :,:
@) 0,cO
(C) 0,0
(A) 2/llsec
a,) o,:
a) 2sec
(C) llsec
4. The resonant frequency of the given
@) 3/llsec circuit is
2F
4H 211
2. In the circuitshown in figurethe switch
is moved fi.om position A to position 8
+_1
M=1H
at tine t = 0 see. The current i through
the inductor satisfies the following
(A, 3±Hz
conditions :
a3, ±Hz
i(0) - -8A, = 3A / sec, i(co) = 4A
(c, i±Hz
The value of R is
@, ±EL
If the Q factor of a coil at resonant
fi.equency of 2.4 NIlz is 120 for series
resonant circuit. The corresponding
bandwidth is
(A) 0.5Q
(A) 225kHz
a3) 2Q @) 100kHz
(C) 4Q (C) 20kHz
a) 12Q a) 48RE
Series-A
06
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6. An RMS voltage of35 V is applied 9. The poles and zeros ofa driving point
impedance function are simple and
across a.1 - ¢ RC series circuit. If the
interlace on the negative real axis with
RMS voltage across the capacitor is
a pole closest to the origin it can be
28V, then the angle between current realized
and supply voltage is (A) AS Lc driving point impedance
(A) sin-I (0.6) a3) AS RL driving point impedance
(C) AS Rc driving point inpedance
a3j cos-I to.8j
a) As R_L_C driving point
(c) tan-I (0.75) inpedance
a)) corl (0-75)
10 A two port network is defined by
following pair of equations i] = 2Vi + V2
7. CaLuser and Foster foms ofrealizatious
and i = V, + V2. Its impedance
are used only for
(A) Driving point reaction functions parameters
ZrJ. 7-T2
(Zll Z12
a) Transfer reactance functions
(C) Driving point impedance
functions
(D) Transfer impedance functions
8. Forthenetworkshowninfig. Z(0)=5 a
and Z(co) = 2 a, what are the values of
Ri and R2 respectively ?
11 Thehparametersh],andh22arerelated
to Z and Y paraneters as
(A) hLL=Z„andhca=±
@) h,,=Ziiandh22`=Y22
(A) 2Q,3Q
a) 2Q,1Q (C) h„=±andh22=±
(C) 3Q.2Q
@) hii=+ andh22=Yac
a)) None of the above
Series-A 06
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A, 8, C, D represent the transmission The vector from the origin to the point
12-
A is given as (6, -2, 4) and the unit
I)arameters of 2-port network. State the
vector from the origin towards porn 8
condition for reciprocal network.
is (2/3, -2/3, 1/3). If points A and 8 ale
(A) AB-CD=1 ten ults apart, the coordinates of point
8 are
@) AD-BC-I
(A) 6.2ax-6.2fty+ 3.1az
(c) AB-CD-0
a3) 7.75a*-7.758ay+ 3.876az
@) AD-BC-0
(C) 6.2ax-7.83ay+3.1qz
a)) 7.83ax-6.2ay+ 3.92az
13. The current in the given circuit is
5QI
16 Find the interior angles at A and 8 of
the triangle defined by three points
A(1,3,-2),8(-2,4,5)andC(0,-2,1).
(A) OA=62.5°,OB=45°
a) ©A=65.3°,©B=3oo
(A) 9A
(C) OA=65.3°,OB=45.9°
a) 7-75A
a) ©A=60°,©B=45°
(C) 10.25A
a)) 4A
The electric field across a dielectric air
interface is shown in the given figure.
14. The maximum space rate of change of The surface charge density on the
the function which is increasing in the e=1 tE-5r
interface is
direction of the function is known as
€=2 tE-25'
(A) Curl of the vector function (A) -4eo
a3) Gradient of the scalar function a3) -3€o
(C) Divergence of the vector function (C) -2€o
a) Stokes theorem a) -€o
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18. Ohm's law in point fom in field theory 22. Six equalpointchanges Q = 10 nc are
can be expressed as located at 2 in, 3 in, 4 in, 5 in, 6 in. 7 rn.
Find the potential at origiv.
(A) V-RI
(A) 140-35
a3) J-E
a a3) 141.35
(c) J-oE (C) 142.35
a) 143.35
(D) R-i
A
23. Throughmethod of images aproblem is
19. A plane slab of dielectric having solved by replacing the boundary with
dielectric constant 5, placed normal to a a polygon of shape :
uniform field with a flux density of
(A) Rectangle
2C/m2 is uniformly polarized. The
a) Trapezoid
polari2ration of the slab is
(C) Squne
(A) 0.4C/m2
a) Triangle
@) 1.6C,m2
(c) 2.OC/m2
24. Stokes' theorem can be used to find the
@) 6.4C/m2 following :
(A) Areaenclosedby afunction inthe
20. The electric field intensity is defined as given region
(A) Force per unit charge (8) Volume enclosed by afunction in
the given region.
(8) Force on thetestcharge
(C) Force per unit charge on a test (C) Linear distance
charge a) Curl of the function
a)) Product offorce and charge
25. Calculate the EMF when the flux is
21. Gauss surface is given by 3 sin (t) + 5 cos (t).
(A) Real boundary (A) 3cos(t)-5sin(t)
@) Imaginay surface a3) -3 cos(t)+5 sin(t)
(C) Radial surface (C) -3 sin(t)+5cos(t)
a)) Tangential surface @) 3sin(t)+5cOs(t)
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26. When the conduction current density What will be the reflected wave for an
and displacement current density are elliptically polarized wave incident on
same, then the dissipation factor will be the interface of a dielectric at the
Brewster angle ?
(A) Zero
(8) Minimum Ellipticallypolarized
(C) Maximum Lineady polarized
a) Unity Richt circuharly polarized
Left circularly polarized
27. The cliarge build up in a capacitor is
due to
(A) Conduction cunent A waveguide can be considered to be
a3) Displacement current analogous to a
(C) Polariration (A) Lowpass filter
a) Dissipation a) Highpass filter
(C) Bandpass filter
28. The transmission coefficient of a wave
propagation in the Brewster angle is a) Band stop filter
(A) Infinity
a)0 h free space if p = 0, the Poisson's
(C)1 equation becomes
a)) -1 (A) Maxwell's divergence equton
V.B-0
29. A translnission line has R, L, G and c
distributed parameters per unit length q3) Laplacian equation v2V = 0
of the line, I- is the propagation (C) Kircbhoff s voltage equation
constant of the line. Which of the £V-0
following expressions gives the
@) None of the above
characteristic impedance of the line ?
(A)
R+j®L What does the expression ij.A
R+j®L represent ?
a) r`
(A) Power density
G+j®C
(C) @) Radiation resistance
(C) Magnetic energy density
I.,„ ,,'`¥:::*
0) , Electric energy density
SeriestA
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34. VxH=Jisdifferentialfomof 38. h a super conductor, if the temperature
decreases below its critical
(A) G5uss' Law
temperature, the value of critical
a) Poisson's equation
magnetic field will be
(C) Ampere's circuital Law
(A) Increases
a)) Laplacian equation
a) Decreases
35. A mierowave oven irradiates food with (C) Not change
electro-magnetic radiation that has a a) Increases or decreases depending
frequency of about 10]° Hz. The on the super conducting material
wavelength of these waves is of the
order of 39. Piezoelectric effect is the production of
(A) metre electricity by
a) centimeter (A) Chemical effect
(C) millimeter a3) Pressure
a) micrometer (C) Varying field
a) Temperature
36. An electro-magnetic field is radiated
fr Om
40. Hall effect can be used to measure
(A) Stationary point charge
(A) Mobility of semiconductor
a) A capacitor with a voltage
q3) Conductivity of semiconductor
(C) A conductor carrying a DC
current (C) Resistivity of semiconductor
a) An oscillating dipole a) All of the above
41. Which of the following statements is
37. The temperature coefficient of correct ?
resistance of a wire is 0.004/°C. If the
(A) Hau coefficient of an intrinsic
resistance of the wire is 4 a at 0° C,
semiconductor is positive.
what the resistance of the wire is at
1000 C ? a3) Hall coefficient of an intrinsic
semiconductor is negative.
(C) Hall coefficient of an intrinsic
semiconductor is zero.
a) Hall coefficient of an intrinsic
semiconductor is infinity.
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Which of the followiDg materials is
42. It is possible to destroy the super
used for the cable insulation ?
conductivityofamaterialbyapplying
(A) Copper
(A) A strong magnetic field
@) Aluminum
a3) A temperature much below the
transition temperature (C) Polytetra fluoroethylene
a)) Polyvinyl chloride
(C) A strong electric field
a) A pressure below that
atmosphere The majority charge carriers in P-type
senriconductor are
Holes
43. Highest electrical resistivity exists in
Free electrons
(A) Platinum wire Ious
a3) Goldwire Conduction electrons
(C) Silverwire
a) Nichrome wire Forbidden energy gap of carbon in
diamond structure is
44. In a dielectric, the power loss
proportional to
(A) 0)
a3) ®2
(C) 1/a
A Germanium atom contains
a) 1,®2 Six valence electrons
Four valence electrons
45. Adielectricmaterialhastherealpartof Only two electron orbits
thedielectricconstant[ei]as5andits Three valence electrons
loss tangent is 0.005. The complex
In an intrinsic semiconductor there are
dielectric constant [ e; ] is represented -
(A) No mobileholes
by
a) No free electrous
(A) 5+jo.025
(C) Neither free electrous nor mobile
a3) 5-jo-025 holes
(C) 5+jo.005 a)) Equal number of free electrous
a) 5-jo.005 and holes
Series-A
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51. What happens to the resistance of a 55 With increase in temperature, magnetic
cc)nductor if its length is increased by 4 susceptibility of a ferro-magnetic
tines and diameter is reduced to half ? material
(A) Resistance is same. (A) Increases
(8) Resistance reduced by 4 times.
a) Decreases
(C) Resistance increased by 8 times.
(C) Remains constant
a) Resistance increased by 16 times.
(D) hitially increases and then
decreases
52. Which of the following materials
cannot be used for pemanent magnet ?
56. High frequency transformer cores are
generally made from
Bariun ferrite
(A) Mu-metal
Carbon steel
a) Mono-metal
Iron cobalt alloy
(C) Ferrites
53. Hard magnetic material is characterized a) Cobalt
by
(A) High coercive force and low 57 In a PMMC iustrunent the damping is
residual magnetism provided by
(8) Low coercive force and high (A) Air ffiction damping
residual magnetism
a) Fluid friction damping
(C) Low coercive force and low
residul magnetism (C) Eddy cunent damping
@) Magnetic damping using magnet
(D) High coercive force and high
residual magnetism
58. A DC voltmeter has a sensitivity of
54. Above Curie temperature the 1000 £2/V. When it measures half full
spontaneous polarization of ferro- scale in 100 V scale range, the current
electric material is through voltmeter is
(A) 100mA
a3) 1mA
(C) 0.5nIA
a) 50mA
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59. A 0 - 300V voltmeter has an eITor of An electro-dynanometer type
± 2% of .full scale deflection. What is wattmeter is connected (as shown in
the range of readings if true value of fig) in a 3-¢ supply and having 3-dy
voltage is 30 V ? balanced load. V and I are the values of
(A) 20V-40V phase voltage and phase current, © is
a) 24V-36V phase angle betveen them. The
wattmeter reading will be proportional
(C) 29.4V-36.6V
to
a>t 24.6v-35.4v
1-1\, 1'12c)-._93
Watfroeter
60. Which of the following instruments P.C
operates without controlling torque ? 2
rYm 12
(A) Electrostatic meter
a) Wattmeter TccL
(C) Dynamometer typemeter
a) Power factor meter (A) Vlcoso
@) VItano
61. Which of the following is an active
(C) Vlsin©
trausducer ?
(A) Piezo-electric pressure transducer
a) zero
a3) Metallic strain gauge
Two wattmeter method is used to
(C) Semiconductor strain gauge
measure power in balanced 3-a circuit
(D) Platinum resistance thermometer
drawing lagging current. The power
factor of the load, if one of the
62. Which of the following is basically a
wattmeter reading is zero, will be
current sensitive instrument ?
(A)0
(A) P"C
@) 0.8
@) CRO
(C;) 0.Jor
(C) Electrostatic instrument
a)) FET input electronic voltmeter a) 0.5
Series-A
06
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65. 1-a energymeterhaving meter constant 69. Potendometer is basically
of 250 revckwh is operating at 240V, (A)` Deflection type instmment
50Hz with a load of 15A at UPF for 4
hours. The number of revolutions (8) Digital instrument
shown by meter during this period is (C) Null type iustmment
(A) 36000 (D) Deflection as weu as null type
@) 3600 instrument
(C) 360
a)36 70. Q-meter works on the principle of
(A) Mutual inductance
66. Creeping error may occur in induction
type energy meter due to a3) Self inductance
(C) Series resonance
(A) Incorrect position of brake
magnet (D) Parallel resonance
a3) Incorrect adjustment of position
of shaded band
71. The errors in the current transformers
(C) Over voltage across voltage coil
are mainly due to
(D) Increase in temperature
(A) Leakage flux
67. Which of the following bridges is used a3) ExcitationENI
to determine frequency ? (C) Secondaryload
(A) Anderson bridge a) Coreloss
a) Desauty bridge
(C) Campbell bridge
72. Two equal voltages of same frequency
@) Wienbridge
applied to the X and Y plates of CRO,
produces a circle on the screen. The
68. DieLectric loss of a capacitor can be
phase difference between the two
measured by which of the following
voltages is
bridges ?
(A) 300
(A) Wienbridge.
a3) Owenbridge a) 900
(C) Scheing bridge (C) 600
a) Maxwellbridge a) 1200
1 Series-A 11 06
Text of page 12
73. A Lissajous pattern on an oscmoscope A synchro is used to
has 6 horizontal tangencies and 3 (A) ` Accelerate the rotating shaft
vertical tangencies. The frequency of
a3) Convert an angular position of a
horizontal input is 1000 Hz. The
shaft into an electrical signal
frequency of vertical input is
(C) Convert linear motion into
(A) 2000Hz angularposition
(8) 200Hz
a)) Amplify low frequency signal
(C) 5000Hz
a) 500Hz Which of the following is not an
element of electro-pneumatic pressure
74. Which of the following measuring trausmitter ?
devices has mininum loading effect on LVDT
quantity under measurement ?
Bellows
(A) P"C Op-amp
@) CRO
Flapper-nozzle mechanism
(C) Hot wire instrument
a) Electro-dynamometer
9. Doppler shift principle is used in the
me~ment of
75. A 4 digit DVM (digital voltmeter) with
Temperature
a loo mv lowest full scale range would
have a sensitivity of how much value, Frquency
while its resolution is 0.001 ? Speed
(A) 0.1mv' Pressure
@) 0.01mv
(C) '1mv 0. What is the size of the sub matrix "H"
a) 10mv of the Jacobian, if n[ is the number of
PV buses and n2 the number of PQ
76. The sensitivity factor of strain gauge is buses ?
normally of the order of (A) (ni+n2)X(ni+nJ
(A) 1tol.5
a) (nl+n2)
a) 1-5to2
(C) (nl+n2)nl
(C) 0.5to1
@) (ni+n2)n2
a) 5tol0
Series-A
06
Text of page 13
Multiplexerworkwith
81. Roots of the characteristic equlon
gives the (A) Analog signal
(A) for;ed response (8) ` Digital signal
a3) total response (C) Both analog and digital signals
(C) natural response a)) None of the above
a)) Cause ofrespouse
Which of the following is analogous to
multiplexer ?
82. A bulb in a staircase has two switches,
one switch being at the ground floor (A) Data selector
and the other one at first floor. The bulb q3) Data multiplexer
can be ton ON and also tuned OFF by (C) Data filter
any one of the switches inespective of a)) AIl of the above
the state of other switch. The lode of
switchingofthebulbresembles
A binary input 000 is fed to a 3bit
(A) drAND gate DAC/ADC.Theresultantoutputis101.
a) AnoRgate Find the type of error.
(C) AXORgate Settling error
a) AN/END gate Gain error
Offset error
83. A step function is applied to a series Linearity error
RLC circuit.having R = 2 a, L = 1 H
and C = 1 F. The transient current Find the resolution of a 10-bit AD
response of the circuit would be converter for an input range of 10 V ?
(A) Over damped ¢A;) eyrl.6rAV
a3) Under damped a) 9.77mv
(C) Criticauy damped (C;) 0.9]7 TnN
(D) Cannotbe said. a) 0.976mv
84. The process of converting a discrete The value of ranp function tu(t) at
signal to digital fom is known as t - co is
(A) Lineari2ation (A)0
a) Sanpling @)cO
(C) Quntization (C) -cO
a)) None of the above a)1
06
13
Series-A
Text of page 14
90. Which of the fonowing quandty is 93. The RMS value of a given signal
dimeusio.nally different from the other v(t)=2+3J5cos(lot+45°)-3cos(lot)
three ?
is
(A) (A)2
a)RC @) J537Z
®L
(C)
R (a) JTTf52
27t
a) a) Ji7
®
94 Tellegen's theorem is applical]le to
91. A 30 uF capacitor is connected across
an ideal DC voltage source. The current (A) Linear networks only
in the capacitor
a3) .Non-linear networks only
(A) will be zero at first, then
exponentially rise. (C) Both linear and non-linear
networks
a) will be very higiv at first then
exponendally decay.
a)) Neither linear nor non-linear
(C) will be very hich at first then networks
exponentially decaLy and at steady
state becomes zero.
a) None of the above 95. Two 100 W, 200 V lamps are
cormected in series across a 200V
supply. The total power consumed by
92. A network has 12 branches and 8
independent loops. The number of each lanp will be
nodes in the network is
(A) 25W
(A)5
a3) SOW
(8)4
(C) 100W
(C)6
a)3 a) 200W
06 4 Series-A
Text of page 15
96. The circuit shown in Fig. is equivalent 98. In the circuit shown below power
delivered or absorbed by the dependent
to a ioed of
source is
I. 500Q 400f2
(A) 368 W Delivered
(A) 2.4Q
a3) 16WAbsorbed
a3) 4.2Q (C) 192WDelivered
a) 40WAbsorbed
(C) 6Q
99. In the series R-L circuit the switch is
a) loo
closed at t = 0 see. The value of current
at t - 0 sec is
5n2Q
97. The value of R for which maximum
power is transferred from circuit A to
circuit 8 is
(A) OA
a)5A
(C) 2A
a) 10/7A
100. A circuit of R = 2 Q and L = 1 H is
(A) 2Q excited by a step voltage of 10 V at
t = 0 see. The current at t = 10 see `
a)1Q (A) 5A
a) 3.16A
(C) 4Q
(C) 0.5A
a)) 0.5Q @)OA
|A SerigrA 06
Text of page 2
JHARKHAND PUBLIC SHRVICE COMMISSION
Revised Answer Key
Assistant Engineer (Civil, MechanicalAIlectrical) Advt. No.-08/2018 and 08/2019
Subject- (General Ability Test)
Ouesti on Nos.
Revised Correct ®pfron
series - A series - a Series - C Series - D
QUESTION IS INCORRECTTWOMARKSRILLBEGIVENTOALL
57 26 5 93
81 55 34 18 8
84 53 32 16 BOTH C & D ARE CORRECT
97 66 SO 34 A
EEEu]
:rhian
Controlle ination
Jharkhand Public Service Commission,
Ranchi
Text of page 3
JHARKHAND PUBLIC SERVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.-08/2018
Subj ect- (Mechanical Engineering Paper-I)
Ouesti on Nos*
Rchsed Correct Option
Series - A series - 8 series - c Series - D
41 2S 4 83 A
42 21 5 84 8
52 31 15 94 C
53 32 11 95 A
60 39 18 97 C
79 S8 37 16 C
83 62I 41 25 A
9r-(:L- ,A
EE
I HillF
Controller f tlon
Jharkhand Public Service Commission,
Ranchi
Text of page 4
JHARREAND PUBLIC SERVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.-08/2018
Subj ect-(Mechanical Engineering Paper-H)
Ouesti on Nos,
Revised Correct a Pfiun
series - A series - 8 series - c series - D
ALL OPTIONS AREINCORRECTTWOMARKSWELLBEGIVENTOALL
29 11 94 67
34 14 100 71 C
45 25 8 79 BOTH A & 8 ARE CORRECT
ALL OPTIONS ARECORRECT
80 63I 46 17
01
Controller fExaination
Jharkhand Public Service Commission,
Ranchi
Text of page 5
JIIARKIIAND PUBLIC SHRVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.-08/2018
Subject- (Civil Engineering Paper-I)
Question Nos.
` Series - 8 ' Revised c\®rreefo H.
tion I
series - A series -, c sutes - D
12 90 67 47 C
13 91 68 44 A
16 94 71 51 A
31 9 86 62 C
63 41 18 94 8
8S 63, 40 19 D
th
Jharkhand Public Service Commission,
Ranchi
Text of page 6
JHARKHAND PUBLIC SEIRVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.- 08/2018
Subject- (Civil Engineering Paper-H)
Ouestio n Nos.
' Series - A Revised C®rmeef Oprfum
• series - 8
Series ~ C series - D
2 79 61 40 C
44 24 2 81 A
62 39 20 99 D
84 61 39 18 8
88 651 43 22 8
p-|`` fi
E=
Controller o Examination
Jharkhand Public Service Commission,
RanchiPage 1 of 15
Source: Jharkhand Public Service Commission. Question paper published by Jharkhand Public Service Commission.