Question Booklet Series
lAl
Electrical Engineering CODE:-08
Time Allowed: Two Hours Marks: 100
Roll No.



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KL-14/EE Series-A

1. A polynomial((x) a4x4+a3x3+a2_l+ap:; -aowith all coefficients positive has:
real roots


no negative real root


odd number of real roots


at least one positive and one negative real root


2. The value of the integral dz ,where c is the circle Izi lis given by:
c Z
0 (B).2.. I
10 5
3. The steady-state error of a feedback control system with an acceleration input becomes
finite in a
0 system. type 1 system.

type 2 system. type 3 system.
4. The impulse response of a LTI system is a unit step function, then the corresponding transfer function is
lis 1/s2 1 S
5. Given a unity feedback control system with the value of K for a damping

ratio of 0.5 is
16
6. If the transfer function of a first-order system is then the time constant of
1+25
the system is
10 1/10 2 1/2
7. A good control system has all the following features except

good stability slow response


good accuracy sufficient power handling capacity


8. Which of the following is the best method for determining the stability and transient
response?


Root locus Bode plot


Nyquist plot None ofthe above


9. Addition of zeros in transfer function causes which of the following?

Lead-compensation Lag-compensation


Lead-lag compensation None of the above


10. The control system design specification for a chemical process is described as short settling time, improved damping and zero steady state error. What control do we choose?
P PI ID PID
11. When a system's frequency response crosses the point

the Gain Margin is I dB the Gain Margin is 00


the Phase Margin is zero the Phase Margin is 1800


12. The Laplace transform of e-2t Sin2rot is:
25

2(0 25

KL14/EE Series-A

13. The fourier transform of a continuous time signal X(tJ exp( It a>0 is

aZ+ruZ
14. Maxwell's equations involve

Charge density Current density


Magnetic intensity All of these


15. Electric Potential Energy V is given by the expression:

41tEo R 41l&o QlqZ
Q1 QZ
41t£o R
16. Which of the following is a low-gain antenna?

Dish antenna on a space craft Wi-Fi antenna


Both and None of the above


17. Magnetic vector potential for volume current is expressed as
lloJdV

4J1"r
lloJdV

471r 2

i
2J1"r
lloJdV
2m'Z
18. For a good dielectric medium.
0 1
roE ruG
00
roE
19. Gold and silver are

dielectric materials low resistivity conducting materials


magnetic materials insulating materials


20. Hall effect may be used for which of the following

determining whether the semiconductor is porn type


determining the carrier concentration


calculattng the mobility


All the above


KL14/EE Series-A
2
21. The property due to which the resistance of some metal or compound vanishes under certain conditions is known as

Semi conductivity. Magnetostriction.


Curie point. Super conductivity.


22. A 32 to 1 multiplexer has the following features.

32 inputs, one output and 5 control signals


32 outputs, one input and 5 control signals


5 inputs, one control signal and 32 outputs


5 inputs 32 control signals and one output


23. What J-K input condition will alway.s set upon the OCCUlTence of the actiye clock transition?
K=0 J K 1
J
24. How many comparators would a 12-bit flash ADC require?
4095 3095 4000 2512
25. The number of states in its counting sequence that a ring counter consisting of flip­flop scan have is
2n-1 2n+ 1
26. In a sample and hold circuit the following statement is false:

Sample time is much smaller than hold time.


Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes.


Acquisition time is the time it takes for the capacitor to charge from one voltage to another voltage.


The voltage across the hold capacitor changes by 50% during hold time.


27. The fastest switching logic family is
CMOS TTL DTL EeL
28. A bridge rectifier provides SOmA cunent at 150V, the average cunent and PIV rating of each diode, respectively are:

79mA, 167V 25mA, 236V


12.5mA, 167V 25mA, 120V


29. A dc power supply has a no-load voltage of 30V, and a full load voltage of 25V at a full load cunent of lA. Its output resistance and load regulation respectively are:

5Q, 20% 25Q, 20%


5 16.7% 25 16.7%


30. Compared to bipolar transistor, a JFET has

lower input impedance


higher voltage gain


higher input impedance and high voltage gain


higher input impedance and low voltage gain


KL14/EE Series-A
31. Input impedance ofMOSSFET is

less than of FET but more than BJT


more than that of FET and BJT


more than that of FET but less than BJT


less than that of FET and BJT


32. A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder
2K 4K 16K 64K
33. The decimal value for the BCD coded number 000I00 lOis
6 10 12 18
34. In a DMA write operation the data is transferred

from I/O to memory. from memory to I/O.


from memory to memory. from I/O to I/O.


35. Pseudo instructions are basically

false instructions.


instructions that are ignored by the microprocessor.


assembler directives.


instructions that are treated like comments.


36. For attenuation of high frequencies we should use

Shunt Capacitance Series Capacitance


Inductance Resistance


37. A400W is amplitude modulated with m 0.75. The total power in AM is
400 588 650 512
38. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?
1002 1000 998.2 998.8
39. Push pull amplifier is

Voltage amplifier Current amplifier


Power amplifier None of the above


40. In an FM system, when the AF is 500 Hz and the AF voltage is 2.4 the deviation is
4.8 kHz. If the AF voltage is now increased to 7.2 the new deviation will be:
4.8kHz 14.4kHz 28.8kHz 9.6kHz
41. In phase controlled rectification power factor

Remains unaffected


Improves with increase of firing angle a


Deteriorates with increase of a


Is unrelated to a


KLl4/EE Series-A
42. Snubber circuit is used to limit the rate of

Rise of current across SCR Conduction period


Rise of voltage across SCR None of the above


43. While working in series operation, equalising circuits are added across each SCR to provide unifoffil

Voltage distribution Firing ofSCRs


Current distribution None of the above


44. During forward blocking state, the SCR has

Low current, medium voltage


Low current, large voltage


Medium current, large voltage


Large current, low voltage


45. A three-phase, fully controlled thyristor bridge converter is used as line commutated invel1er to feed 50 kW power 420 V dc to a three-phase, 4l5V(line), 50 Hz ac mains. Consider dc link CUlTent to be constant. The rms cUlTent of the thyristor is

119.05A 79.37A


39.68A 68.73A


46. When the firing angle u of a single phase fully controlled rectifier feeding constant dc current into a load is 30° the displacement power factor of the rectifier is:
1 0.5 0.866 1/3
47. AC-to-DC circulating cun-ent dual converters are operated with the following relationship between their triggering angles (uI and U2) .

ut+u2=180° ul+u2=360°


ul-u2=180° ut+u2=90°


48. Expression of average output voltage(V0) of a step up chopper in terms of applied input dc voltage Vi and duty cycle a is:
Vi aVi
a l+a l-a
49. What is the condition to be satisfied (for under damping) in the selection of Land C in a series invel1er?
R2<2L R2>4L R2= 4L R2<4L
c Ccc
50. The consideration involved in the selection of the type of electric drive for a pal1icular application depends on

Speed control range and its nature Starting torque


Environmental conditions All ofthe above.


51. When quick speed reversal is a consideration, the motor preferred is

dc motor squirrel cage induction motor


wound rotor induction motor Synchronous motor


KLl4/EE Series-A
52. Average output voltage(Vo) in ten11S of maximum input voltage (VITI) of a Half Controlled Bridge converter at firing angle a 90° is:
2VI11 In VI11 In In 0
53. The speed of a D.C. shunt motor more than its full-load speed can be obtained by

decreasing the field cunent increasing the field cunent


decreasing the annature current increasing the annature cunent


54. In squirrel cage induction motors, the rotor slots are usually given slight skew in order to reduce

windage losses eddy currents


accumulation of dirt and dust magnetic hum


55. A 3-phase 440 50 Hz induction motor has slip. The frequency of rotor e.m.f. will be
200Hz Hz (C)2Hz (D)0.2 Hz
56. In a three-phase induction motor, the number of poles in the rotor winding are always

zero


more than the number of poles in stator


less than number of poles in stator


equal to number of poles in stator


57. A single-phase induction motor is

inherently self-starting with high torque


inherently self-starting with low torque


inherently non-self-starting


none of the above


58. Which of the following single phase motors will operate at high power factor?

Shaped pole motor Split phase motor


Capacitor start motor Capacitor run motor


59. The X R ratio of 220 kV line as compared to 400 kV line is

greater smaller


equal it could be anything


60. The corona loss on a particular system at 50 Hz is I kW/phase !kIn. The corona loss on the same system with supply frequency 25 Hz will be

1 kW/phaselkm 0.5 kW/phaselkm


0.667 kW/phaselkm None of the above


61. The main criterion for selection of the size of distribution for a radial distribution system is:

voltage drop corona loss


temperature rise capital cost


62. If an induction machine is run at above synchronous speed, it acts as

a synchronous motor an indcution generator


an inductor motor None ofthe above


KL14/EE Series-A
63. The non-unifOlm distribution of voltage across the units in a string of suspension type insulators is due to

unequal self-capacitance of the units


non-uniform distance of separation of the units from the tower body


the existence of stray capacitance between the metallic junctions of the units and the tower body


non-uniform distance between the cross-arm and the units


64. An alternator has a phase sequence of RYB for its phase voltage. In case the direction of rotation of alternator is reversed, the phase sequence will become
RBY RYB . YRB BRY
65. An alternator is said to be over excited when it is operating at

unity power factor leading power factor


lagging power factor none of the above


66. Which of the following contributes to the improvement of efficiency of Rankine cycle in a thermal power plant? .

Reheating of steam at intermediate stage


Regeneration use of steam for heating boiler feed water


Use of high pressures


All of the above.


67. Zero sequence currents doesn't exist in the following fault
L-G L-L
68. Insulators in EHV lines are clesigned based on

switching voltages peak voltages


corona lightning voltages


69. Which special type of motor has rotor movements in discrete steps

stepper motor reluctance motor


hysteresis motor servomotors


70. A 550 55 kVA single phase alternator having effective resistance of0.2 Q. A field current of 200A on short circuit end and an emf of 400 V on open circuit. The synchronous impedance will be
4.25 Q 3.25 Q 2.14 Q 2.25 Q
71. Three 6Q resistors are connected to form a triangle. What is the resistance between any two comers?
Q Q 8/3 Q
72. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
10W (B)20W (C)40W 60 W
KL14/EE Series-A
73. "In any linear bilateral network, if a source of e.m.f. E in any branch produces a cunent I in any other branch, then same e.m.f. acting in the second branch would produce the same current in the first branch".The statement is associated with:­

compensation theorem superposition theorem


reciprocity theorem Millman's theorem


74. In Thevenin's theorem, to find Zth

all independent current sources are short circuited and independent voltage sources are open circuited.


all independent voltage and current sources are open circuited.


all independent voltage and current sources are shor1 circuited.


all independent voltage sources are Sh011 circuited and all independent cunent sources are open circuited.


75. In a DC circuit the Thevenin voltage across load is 15V and Norton current is 3A. The maximum amount ofpower that can be transferred to the load is:
30.25W 45W 11.25W 22.5W
76. Zero input response ofa circuit is:

The response when time t=O


The response when initial conditions are zero


The response when applied input is zero


The response when transients are zero


77. A series RC circuit has R 5Q and C 2.511F, the time constant.ofthe circuit is

12.511sec. 0.511sec.


2xlOG sec. 2.511sec.


78. A dynamometer wattmeter can be used for

AC measurement only Both AC DC measurement


DC measurement only None of the above


79. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load is:

0.8 lagging 0.8 leading


Zero Unity


80. For measuring a very high resistance we should use

Kelvin's double bridge Wheat stone bridge


Meggar None of the above


81. Various adjustments in an energy meter include

lag and creep overload and voltage compensation


temperature compensation All ofthe above


82. De Sauty's bridge best suited for

capacitors with dielectric loss lossless air capacitors


high Q low Q


KL14/EE Series-A
83. In an Anderson bridge, the unknown inductance is measured in terms of

known inductance and resistance known capacitance and resistance


known resistance known inductance


84. If an instrument has cramped scale for larger values, then it follows

logarithmic law square law


uniform law None of the above


85. If 25 W of power arc applied to thc primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
250W 2.5W 25W OW
86. In a cel1ain loaded transfOlmer, the secondary voltage is one-fourth the primary voltage. The secondary current is

one-fourth the primary current four times the primary current


sixteen times the primary current two times the primary current


87. The path of magnetic flux in a transformer should have

high reluctance high resistance


low resistance low reluctance


88. No-load current in a transfOlmer

lags behind the applied voltage by about 75°


leads the applied voltage by about 75°


lags behind the applied voltage by about 15°


leads the applied voltage by about 15°



89. A buchholz relay can be installed on

Auto transfonner air cooled transfornler


welding transfonllers oil cooled transfornler


90. A transfonner can have zero voltage regulation at

leading power factor unity power factor


lagging power factor zero power factor


. 91. In a Delta -Delta connected transformer, if one of the transformer winding is open, the capacity will reduce to:
66.67% 57.74% 50% 33.33%
92. Scott connections are used for:

Single phase to three phase transformation


Three phase to single phase transformation


Three phase to two phase transformation


None ofthe above


93. The excessive temperature rise in the Transformer causes maximum damage to:

Winding insulation Core laminations


Copper wining Dielectric strength of the oil


KLI4/EE Series-A 94.The Power-factor at resonance in circuit is

zero unity


0.5 lagging 0.5 leading


95. Which of the following will improve the mutual coupling between primary and
secondary circuits:


Transfonner oil of high breakdown voltage


High reluctance magnetic core


Winding material of high resistivity


Low reluctance magnetic core


96.ft control system with excessive noise, is likely to suffer from

saturation in amplifying stages loss of gain


vibrations oscillations


97. Which of the following methods is used to control speed of25 kV, 50 Hz single phase traction?

Reduced current method


Tap changing control oftransfolTI1er


Series parallel operation of motors


All of the above


98. Induction type single phase energy meters measure electric energy in
kW VA kWh VAR
99.1n majority of instruments damping is provided by

fluid friction spring


eddy currents None of the above


lOO.A network that does not have either voltage or current is called

Active network Passive network


Resistive network Dummy network


KLl4/EE Series-A