ME1315
ELECTRICAL ENGINEERING Paper Series

A

51. 413 229
Duration: 150 Minutes Max. Marks: 300
INSTRVCfIO. S TO CANDIDATES
1.
Please check the Test Booklet immediately on opening and ensure that it contains all the 150 multiple choice questions printed on it.

2.
Separate Optical Mark Reader Answer Sheet is supplied to you along with the Question Paper Booklet. The 0 IR Answer sheet consists of two copies i.e., the Original Copy (Top Sheet) and Duplicate Copy (Bottom Sheet). The OMR sheet contains Registered Tumber/Hall Ticket umber, Subject/ Subject Code, Booklet Series, arne of the Examination Centre, Signature of the Candidate and Invigilator etc.,

3.
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4.
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5.
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Example to fill lip the Booklet series
If your test Booklet Series is please fill as shown below:

{p.T.a.
1



503/A The algebraic sum ofvoltages in any closed path of network is equal to One Zero Two Infinity
I The minimum number of wattmeters required to measure 3-phase power is 3 2 4 0
In a maximum power transfer theorem the internal resistance must be Equal to internal resistance Equal to zero Equal to load resistance Greater than internal resistance
Specific resistance ofmaterial is measured in n-m n _m2 n/m m2/n
At t an inductor with zero initial conditions acts as Open circuit .short circuit Charging Discharging
The Laplace transform oft.eat is
In two wattmeter method ofpower measurement when power factor is unity, the readings of two wattmeters WI and W2 are .WI> W2 WI W2 WI W2 WI or W2 0
b ­n 1 b n ­1 Let is a branch, is the node in the graph of network theory then the number of chords is equal to b ­1 b n 1
5 [P.T.O.



503/A The reciprocity theorem is applicable for

Only multisource network


Multisource with timevarying elements


Only single source network


Single source with time varying elements


10) The frequency at which a series RLC circuit resonates is d pendent on the values of

Land C Land C


RandL CandR


11) The phase angle between the inductor current and the applied voltage is

900 0°


1800 45°


12) P -J3 VLlL cos is the power expression for 3-phase system, then phase angle is the angle between

Line voltage and line current


Phase voltage and phase current


Line voltage and phase current


Phase voltage and line current


13) lfthe source is delivering maximum power to load, then the efficiency is

100%


75% 50%


14) A 10 amp source is connected across two parallel resistors of 3n and . The current flow in m ,esistor is

6 amps 4 amps


5 amps 2 amps


15) For a RL circuit, R 3.l4n and L IH connected 50Hz
supply, the quality factor is
314.16 100
50.001 1




503/A
16) A dielectric medium is said to be linear if

The permitivity is not a function ofthe electric force


The relative permitivity is same in all the directions


The permitivity is a linear function of the electric force


The permitivity is same everywhere


17) By saying that the electrostatic field is conservative, we donot mean that

It is the gradient of a scalar potential


Its circulation is identically zero


The potential difference between any two points is zero


Its curl is identically zero


18) is the unit of magnetic charge

Ampere-meter squared Coulomb


Ampere Ampere -meter


19) As per the concept ofanalogy between electric and magnetic circuits, the analogy pair

Conductivity -Permeability


Field Density -Field intensity H


Current -charge


Conductivity -permitivity


20) Lightning may be regarded as

Transient, high current electric discharge


Transient, low current electric discharge


Transient, high current magnetic discharge


None of the above


21) is the unit of electric dipole moment

Cou1omb/m Coulomb-m


Coulomb/m2 m/coulomb


22) Iftheelectricalsusceptibility ofaparticularmaterialis then its

Relative permitivity is Y-l


Relative permeability is Y-1


Relative permitivity is 1


None of the above


7 [P.T,D.
503/A
23) Device employing the Hall effect is used to measure

Electric flux density


Magnetic flux density


electric charge


Magnetic flux


24) relates the surface integral of the Curl of vector'A' over dle open surface enclosed by a given closed path

Divergence dleorem Gradient dleorem


Stokes theorem I Poynting theorem


25) The electric field lines are

Straight lines


Smooth curved lines


Either straight lines or smootil curved 1m


Closed lines


26) The power factor of an Induction motor at no I I around

0.2lead


0.51ag lag


27) A transformer has at full load, iron loss of900 copper loss of 1600 watts. Then tile transformer will have a maximum at a load of

133% ..


75% 66


28) A DC generator will be flat compounded if

Its terminal voltage remains constant irrespe load current supplied by the generator


Generated voltage is in proportion to load curr


The generator is capable ofproducing higher volIa: load


Terminal voltage increases slightly widl the load


29) A DC series motor develops a torque of20 N-m at 3 amp--urrent, If tile current is increased to 6 amps, tile torque developed ill

10N-m 20


40 N-m 80





503/A

30) A transformer possesses a percentage resistance and a percentage reactance of and respectively. Its voltage regulation at power factor 0.8 lagging and 0.8 leading would be

2.4 and 3.2% and


3.2% and 48% and



31) An induction motor has a starting torque of 320 N-m when started by direct switching. Ifstarting through an auto transformer with 50% tapping, the starting torque wiU be

0.05 N-m 80N-m


160 N-m 640N-m



32) Under short circuit conditions, the power factor ofan alternator is

Almost zero lagging


Unity


Almost 0.6 lagging


Almost zero leading



33) I and T are the line current and torque respectively when DOL starter is used,
these quantities when starter is used, are:

KY.)3 1.)3


1.J2'Y.J2



3.t) To reverse the phase sequence ofvoltage generated in the alternator, we should

Reverse the connection of its field \1ndmg


Interchange any two ofits phase termmals


Interchange all three ofits phase terminals


ot po-sible to change the phase sequence



35) In an alternator, the following method gIYe the voltage regulation more than the actual value
Zero power factor method

Synchronou impedance method


mmfmethod


No load method


9 [P.T.a.
S03/A 36) The direction of rotation of a DC shunt motor is reversed by

Reversing armature connections


Interchanging the armature and field connections


Adding resistance to the field circuit


Reversing supply connections


37) The internal characteristic of the DC generator i the curve between

Armature current and the generated e.m.f.


Load current and terminal voltage


Field current and no load voltage


Armature current and IR drop


38) The damping winding in a synchronous motor is generally used

To provide starting torque only


To reduce noise level


To reduce eddy currents .


To prevent hunting and provide the starting torque



39) A 100v/lOv, 50vA transformer is converted to 100v/llOv auto transformer, the rating of the auto transformer is

550vA 500vA


1l0vA 100vA



40) Ifthe excitation of the synchronous generator fails, it acts as a

Synchronous motor


Synchronous generator


Induction motor


Induction generator



41) A cumulative compound dc motor runs at 1500 rpm on full load. If its sen field is short circuited, its speed

Becomes zero Remains unchanged


Increases Decreases



42) Ifan induction motor with certain ratio ofrotor to stator slo runs at the Il7'h of the normal rated speed, the motor is said to be

Hunting Crawlin_


Cogging Jogging



503/A 43) In case ofan Alternator, for a full pitch stator winding, the generated voltages in both coil sides are

Exactly in phase


In quadrature


Exactly 180 degrees out of phase


Appro imately 180 degrees out of phase



44) Synchronous reactance of an alternator represents

Armature reactance and leakage reactance


Reactance operating at synchronous speed


FI ld winding reactance


A reactance connected in series with a synchronous generator



45) A transformer takes a current of0.6 A and absorbs 64 W when the primary is connected to its normal supply of200v, 50Hz, the secondary being on open cir uit. The iron loss component of current is
0.2A 0.43A
IA 0.32A


46) A 250 v DC shunt motor takes a total current of 20A. Resistance of shunt field winding is 200 ohms and that of the arnlature is 0.3 orun. Then the armature current is

9.65 A 11.25A


18.75 A 16.62 A



47) The voltage regulation ofan alternator depends on

Load current only


Power factor only


Both load current and power factor


No load current only



48) The distribution of load between two alternators operating in parallel can be changed by changing

Phase sequence


Field excitation ofalternators


Driving torques ofprime movers


Load currents of alternators


11 [P.T.O.


503/A 49) In caseofpowertransformer,thenoloadcurrentin tennsoffullloadprimary current is

3to5% ISto30%


30 to 40% 40 to 50%


50) The starting torque ofan induction motor is maximum when

Rotor resistance equals rotor reactance


Rotor resistance is twice the rotor reactance


Rotor resistance is halfthe rotar reactance


Rotor resistance is 1.414 times rotor reactan e


51) In an alternator for zero leading power factor, the fii t ofarmature reaction
IS

Magnetizing only


Demagnetizing only


Cross magnetizing only


Zero effect


52) The curve ofa synchronous motor shows th tween the following quantities

Armature current and field current


Power factor and field current


Armature current and power factor


Annature voltage and power factor


53) Which of the following motors is suitable for hi_ torque

Shunt motor


Cumulative compound motor


Series motor


Compound motor


54) In a DC generator with lap connected winding, the number ofbrusbes required is equal to
Number of poles
Number of pairs of poles
Halfthe number of poles
Always equal to zero

12



503/A

55) The field winding ofan alternator is excited by

DC supply AC supply


Both DC and AC Universal supply



56) A 3-phase transfonner rated for 33 kv/ 6.6 kv is connected in star/delta and
the protecting current transfonner on the low voltage side has a ratio of400/S.
Then the suitable CT ratio on the HV side

80:S 80: sJ3
80:SIJ3 160: sJ3

57) For complete protection of a 3-phase line:

Three phase and three-earth fault relays are required


Three phase and two-earth fault relays are required


Two phase and two-earth fault relays are required


Two phase and one-earth fault relays are required



58) For a 20 bus power system with one voltage controlled bus, the size of tJ1e Jacobian matrix is

16xl6 32x32


19x 19 38x38



59) The Severity of line to ground and three phase faults at ilie temlinals of an unloaded synchronous generator is to be arne, Ifilie tenninal voltage is 1.0 p.u, Zl Z2= j 0.1 p.u and Zo j O.OS p.u. for ilie alternator, then the required inductance reactance for neutral grounding is

0.0166 p.u 0.05 p.u.


0.10 p.u 0.15 p.u



60) Two insulator discs of identical capacitance value make up a string for a 22 kv, SOHz, single phase overhead line insulation system. If the pin to earth capacitance is also then ilie string efficiency is

SO% 7S%


90% 86%




61) For accurate load flow calculations on large power sys'tems, the best method
IS

method Gauss-siedal method


Decoupled method FDLF method


13 [P.T.a.


.-...
503/A
62) A short circuit occurs in a transmission line (neglect line capacitance) when the voltage wave is going through zero, the maximum possible momentary short circuit current correspond to
Twice the maximum of symmetrical short circuit current
The maximum of symmetrical short circuit current
Thrice the maximum ofsymmetrical short circuit current
Four times the maximum of symmetrical shorr circuit current

63) For a Power Transformer

Positive sequence impedance is more than negativ sequence and zero sequence impedances


Positive, negative and zero sequence impedances are equal


Positive and negative sequence impedances Stun is equal to zero sequence impedance


Positive sequence impedance is less than negative sequence and zero sequence impedances


64) The rate of rise of restriking voltage depends upon

The type of circuit breaker


The inductance ofthe system only


The capacitance of the system only


The inductance and capacitance of the system


65) For protection of parallel feeders fed from one end the relays required are:

Non-directional relays at the source end and directional relays at the load end


Non-directional relays at both the ends


Directional relays at the source end and non-directional relays at the load end


Directional relays at both the ends


14


503/A

66) A generator is connected to a synchronous motor. From stability point of view it is preferable to have

Generator neutral reactance grounded and motor neutral resistance grounded


Generator and motor neutrals resistance grounded


Generator and motor neutrals reactance grounded


Generator neutral resistance and motor neutral reactance grounded



67) In EHV Transmission lines, efficiency of Transmission can be increased by decreasing the corona loss. Thi is achieved by

Increasing the di tance between the line conductors


Using bundled conductors


Using thick conductors


Using thin conductors



68) If the penality factor of a Power plant is unity, its incremental transmission loss is

1.0 -1.0


zero 0.5



69) If the loading of the transmission line corresponds to the surge impedance loading then the voltage at the receiving end is

Greater than sending end voltage


Less than sending end voltage


Equal to the sending end voltage


Does not depend on the loading



70) A three phase transmi sion line conductors were arranged in horizontal spacing, with as the distance between the adjacent conductors. Ifthese conductors are rearranged to form an equilateral triangle with sides equal to then the
Capacitance and the inductance will decrease
Capacitance will increase and the inductance will decrease
Capacitance and the inductance will remain the same
Capacitance will decrease and the inductance will increase

15 [P.T.D.

503/A
71) The advantage of corona in a power system is

Power loss is less


Increase the flow of charging current


Reduces the magnitude of high voltage wayes due to lightning


Power loss is more


72) Load flow study is carried out for tability studies
Fault calculations
Load Frequency control
System planning
73) The presence of earth in case of overhead lin

Increases the capacitance


Increases the inductance


Decreases the capacitance and increase lance


Does not affect any of the line can tant


74) Steady state stability of a power system is impr


Reducing fault clearing time


Using double circuit line instead of single cm:Wl


Single pole switching


Decreasing generator inertia


75) Diversity factor is always

Equal to one


Greater than one Z



The open loop transfer function of a conrrol s(s
which ofthe following is the gain margin ofm

20 dB -20 dB
-10 dB



-10dB


77) Characteristic equation of a control system is S4 2sJ 6s2 8s 0 which of the following is the symmetric root pair of the system

±jl ±j.j2


±j2 ±j3




503/A

78) The system with is

Stable and controllable


Stable but wlcontrollable


Unstable but controllable


Unstable and uncontrollable



s+2 79) Aunityfeedbacksystemhasaopenlooptransferfunction
number of encirclements of the point j in Nyquist plot and its closed
loop system is

One counter clock encirclement, stable


One clockwise encirclement, unstable


Two counter clockwise encirclements, unstable


0 encirclements, wlstable



80) The open loop transfer function of a unity feedback system is given by
By what factor the gain should be multiplied so that the
damping ratio is increased from 0.3 to 0.6

0.5 2.0


4.0 0.25



81) The phase angle at w infinity for the transfer function,
jO.5w)
jw j2w) IS

-180°

900


-900

2700


82) The number of roots of the characteristic equation 54 4s1 S2 8s 1 0 lie on the right side of the s-plane

I

0 3
[P.T.a.
17
503/A
83) The system with its state transition matrix is









0
84) The effect of phase lead compensator 011 rise tim band width

Both increase


Both decrease


Rise time increases and band width decreas


Rise time decreases and band width increas


85) The first two rows of routh tabulation of a tJur follows:
S3 11
22

This means there are

Two roots at s=±j and one root in right half 5-e


Two roots at s=±j2 and one root in right half


Two roots at s=±j and one root in left half s­


Two roots at s=±j2 and one root in left half--p me




86) Which one of the following variables cannot be tak n as a state variable

Current passing through an inductor


Voltage across a capacitor


Current passing through a resistor


Output of the integrator


503/A


87) Which of the following compensators is used to increase the speed of the
response Lead compensator Lead lag compensator Lag compensator None of the above
88) Which of the following is not true? State model of the system is unique


In transfer ftmction model, initial conditions are taken as zero


Transfer function is applicable only for linear time invariant systems


In state model, initial conditions are taken in to consideration.



89) The Initial slope of the bode plot give an mdication of

Type of the system Stability ofthe system


Nature of system time response Gain margin



90) A rough measure of band width of a sy tem 1

Phase crossover frequency Gain crossover frequency


Resonant frequency Undamped natural frequency



91) A meter has a full scale angle of90° at a current of IA. Tllis meter has perfect square law response. Assuming spring control, the current for a deflection angle 45° will be
0.5A 0.25A O.707A 0.67A

92) Two ammeters, one will full scale current of I mA and internal resistance of 100 rl and the other with a full scale current of 10mA and internal resistance of 25 rl are cormected in parallel. What is the total current these two meters can carry without any meter reading out of scale?
ImA 10 rnA 11 mA 5mA

93) The resistan.ce of a circuit is found by measuring current flowing and the power fed into the circuit. If the limiting errors in the measurement in power and current are ±I.50/0 and ± respectively, the limiting error in the measurement ofresistance will be
1% 1.5% 25% 35%
19 [P.T.a.
I
503/A
94) Error due to change in frequency in moving iron instrument is reduced by connecting a capacitor across the series resistance is the inductance of the coil, the readings of the instrument will be independent of frequency only when
c=y"




95) Iftwo 300v full scale voltmeters and 2 haYUlg ensitivities of lOOk.QIv and lSOk.QIv are connected in series to measure 500 ". then

and v2 will read 250v each


will read 200v and v2 will read


will read 300v and v2will read


v,andv2willread Oveach.


96) In current transfomlers turns compensa n mainI. to reduce the

Power losses


Phase angle error


Ratio error


Both ratio and phase angle errors


97) PMMC type instrument normally use

Air-friction damping Fluid-friction damping


Eddy current damping No damping is required


98) The inductance of a high quality factor inductor can be measured by a

Schering bridge Wien's bridge


Maxwell's bridge Hay's bridge


99) What will happen if a voltmeter is connected like an ammeter in series to the load

The meter will bum out


The measurement will be too higl


An inadmissably high current will flow


There will be almost no current in the circuit


Manganin Aluminium Nichrome Platinum


100)The best material use for standard resistor is
20

•

503/A

101)Thefunctioning ofcompensatingbindingin the dynamometertype wattmeter is to neutralize the error due to

Power loss in the current coil circuit


Power loss in the pressure coil circuit


The current in the current coil circuit


Voltage in the pressure coil circuit


102)A standard cell of 1.02 Yused with a simple potentiometer balances at 50 em. Then the emf of the cell that balances at 100 em
2.04y O,SIY 4.08v 3.06y
103)The y -input of a CRO is 10 sin lOOt and the x-input is lOcos 100 t. The gain for both x -channel and y -channel is the same. The nature of lissajous
pattern on screen shows Sinusoidal signal an eclipse A straight line A circle
104)Schering bridge is used to Determine dissipation factor of a capaci(2) D tennine inductance ea ure low resistance feasure mutual inductance tor
105)Moving Ifon instruments can be used on A.C. nly Both C and D.C. D.C. only High frequency supply
106)An ideal op-amp Very 510\ lew rate is Slow Fast Infmitely fast

107)In complem representation the number 11100I aI represents the decimal number
37 -31 27 -27
108)The number of mparators required in a 3-bit comparator type ADC is
2
109)The number of unused states in a 4-bit Johnson counter is
12
21 [P.T.a.


50 fA
110) Which of the following is not a characteristic of a flip-flop?

It is a bistable device


It has two outputs


It has two outputs which are complement of each other


It has one input terminal


111) Addressing capacity of 8085 microproce sor IS
8kB 64kB L 16kB
112) In a flash converter, the priority encoder to
Selectthe first input
e highest value input


Select the lowest value input


-rnput
113) On the drain characteristic curve ofa JFET fi

p b-offvoltage
IS

Below the ohmic area


Between the ohmic area and the constan =:emarea


Between the constant current area and th regIOn


Above the breakdown region


114)Address bus length of 8086 microprocessor IS
8 16 2 40
115) A 4-bit R/2R ladder digital-to-analog converter

Two resistor values • re--tor values


Five resistor values f >lor values


116)Binarysubtraction ofadecimal 15from43willutiliz

omplement?
101011 110000 110001 011100
117) The main advantage of the successive -approximau n D erter over the counter -ramp NO converter is its

More complex circuitry Less mp ex lfcuitry


Longer conversion time Shoner fi'ersion time


118) The practical use ofbinary-weighted digital-to-analog conyerters is limited to

R/2R ladder DIA converters 4-bit D A converters


8-bitD/Aconverters Op-amp comparators


22

•
503/A

119) A single -phase full converter with R-L load is triggered at 30°. Then each device conducts for
180° 150° 30° 120°

120)In which of the following both frequency and voltage can be controlled?

Inverter and a.c. voltage controller


Cyclo-converter and a.c. voltage controller


Inverter and cycloconverter


Inverter, cycIo converter and a.c. voltage ontroller



121)A circulating current mode dual converter has the following properties.

size is more and efficiency is high


size is more and efficiency is low


size is less and efficiency is high


size is less and efficiency is low



122)The firing angle ofa I-phase a.c. voltage ODlToll r is zero. Assuming resistive load, the input current wave shape is

a.c. square wave


constant d.c. wave


d.c. sine wave


a.c. sme wave



123)The output frequency ofa I-phase loconverter is found to be 12 Hz then the .input frequency is
50 Hz 60 Hz 40Hz 30Hz

124)An IGBT gas

high input irnpedan e and low conduction losses


low input impedan e and 1m conduction losses


high input irnpedanc and high conduction losses


low input im and high conduction losses



125) Choose a corree tement from the following:

If THD m input p.f. increases


If THD mcreases, input p.f. decreases


Ifdispla ement factor increases, input p.f. decreases


Ifdispla ement factor increases or decreases, input p.f. remain constant.


23 [P.T.O.

503/A 126)Ifthe duty cycle ofa d.c. chopper is then ripple factor is given by
3)a Iia

127)Which ofthe following devices has the low .• faximum switching frequency'?
MOSFET 1GBT CR GTO
128) The converters which operate only in two uadrnnt are

half-wave and full-wave converters


half-wave and semi converters


full wave and semi converters


dual converter and semi-converters


129)Forced communication is necessary in __CIrCtI1tS

GTO Based 0 FET Based


Converter grade SCR r grade SCR


130)In a BIT, when both junctions are forward biased

perating mode is called

cut-off mode forward active mode


saturation mode reverse active mode



131)A 3-phase, 50 Hz induction motor is controlled by a voltage source inverter. The frequency of rotor current at fifth harmonic is

equal to 50 Hz less than250 Hz


more than 250 Hz exactly equal to 250 Hz



I32)At no-load, the ratio of energy loss due to dynamic braking and counter current braking of a separately excited dc motor is
1:3 3:1 1:2 2:1

133)Thevalue ofslipofa 3-phase induction motor at nIh harmonic is approximately
slip/n zero n x slip I

134)1n v/f control ofJ-phase induction motor, when it is operated at above rated speed, then
voltage decreases lorqu d reases
power increases Ip speed increases
and are true A and are true
and are true and are true

24

503/A
13S)Speed of 3-phase induction motor i controlled by 3-phase a.c. voltage controller. Iffiring angle is decreased, then

speed increases peak torque decreases


speed decreases peak torque increases


speed increases peak torque IDcreases


speed decreases peak torque decreases


136)A chopper fed dc motor runs with discontllluous armature current at particular duty ratio. The current can be made cQntmuous by

increasing duty ratio increasing frequency


decreasing duty ratio decreasing frequency


137)In constant power operation of an a.c. drive

voltage is constant and frequency i variable


voltage is variable and frequency i constant


both voltage frequency are constant


both voltage and frequency are variable



138)In 4 quadrant of a drive operation, quadrants II and III are

forward monitoring reverse monitoring


forward braking and reverse generating


forward braking and reverse monitoring


forward monitoring and reverse generating



139)The slip of a 3-phase induction motor IS 0.05. At the instant of dynamic brakmg, the slip is 0.95 -0.05 1.95 0.05
140) peed of a 3-phase a.c. motor is controlled by maintaining constant vlf ratio. Al a very low peeds, the voltage is

proportional to frequency


Ie s than the value ofvoltage in


more than the value ofvoltage in


equal to the rated voltage


Radians Lumens Lux Candela



141)The unit ofluminous flux is

2S [P.T.a.
503/A
142)The heating element must possess

low melting point


high temperature co-efficient


withstand the required temperature with getting oxidised


high resistivity


143)The softening temperature of hand drawn copper electrode is
500°C 300°C lOOO°C ISO°C
144)In an electric traction system coasting means

power supply is on to accelerate train


power supply is cut offand train i allowed to run on its own momentum


power supply on train IS running at onstam peed


power supply on and brakes are applied to op traIn


145)The unit ofspecific energy consumption for an ele me ITa tion system

Watt hours/tonne-kilometer


Watt hours/kilometer


Watt hourslkilometer per hour per second


Watt hours/tonne


146)Which of the motor is best suited for traction

DC shunt motor DC series motor


Stepper motor Shaded pole motor


147)Reflection factor

Reflected light/incident light Incident light/Reflected light


MSCPIMHSCP MHSCP/MSCP


148)The heat produced in the resistance welding at the joints is proportional to
PR Eddy currents VI Hysterisis loss
149) The total lumens reaching the working plane is 60 and total lumens given out by lamp is 100. The utilization factor is

1.66667 160 40 0.6


40 0.05 4620 20


150)A 220 V filament lamp takes a current of IA and produces toral flux of4400 lumens. The lumens per watt is