PAPER-II ELECTRONIC SCIENCE Signature and Name of Invigilator
1.
(Signature) OMR Sheet No. ............................................... (To be filled by the Candidate)

(Name)
Roll No.


2.
(Signature) (In figures as per admission card)



(Name) Roll (In words)
D

Time 1 1/4 hours] [Maximum Marks 100




Number of Pages in this Booklet 8 Number of Questions in this Booklet 50 Instructions for the Candidates

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1. ¯ÖÆü»Öê ¯Öéšü Ûêú ‰ú¯Ö¸ü ×®ÖµÖŸÖ Ã£ÖÖ®Ö ¯Ö¸ü †¯Ö®ÖÖ ¸üÖê»Ö ®Ö´²Ö¸ü ×»Ö×ÜÖ‹ …
1. Write your roll number in the space provided on the top of
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this page.

2. This paper consists of fifty multiple-choice type of
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questions.
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3. At the commencement of examination, the question booklet
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will be given to you. In the first 5 minutes, you are requested
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to open the booklet and compulsorily examine it as below
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To have access to the Question Booklet, tear off the
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paper seal on the edge of this cover page. Do not accept
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a booklet without sticker-seal and do not accept an
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Tally the number of pages and number of questions

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in the booklet with the information printed on the
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»ÖÖî™üÖÛú¸ü ˆÃÖÛêú ãÖÖ®Ö ¯Ö¸ü ¤æüÃÖ¸üß ÃÖÆüß ¯ÖÏ¿®Ö-¯Öã×ßÖÛúÖ »Öê »Öë …

missing or duplicate or not in serial order or any
other discrepancy should be got replaced immediately


‡ÃÖÛêú ×»Ö‹ †Ö¯ÖÛúÖê ¯ÖÖÑ"Ö ×´Ö®Ö™ü פüµÖê •ÖÖµÖëÝÖê … ˆÃÖÛêú ²ÖÖ¤ü

by a correct booklet from the invigilator within the


ŸÖÖê †Ö¯ÖÛúß ¯ÖÏ¿®Ö-¯Öã×ßÖÛúÖ ¾ÖÖ¯ÖÃÖ »Öß •ÖÖµÖêÝÖß †Öî¸ü Æüß †Ö¯ÖÛúÖê

period of 5 minutes. Afterwards, neither the


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Question Booklet will be replaced nor any extra
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time will be given.
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After this verification is over, the OMR Sheet Number
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should be entered on this Test Booklet.
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4. Each item has four alternative responses marked
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and You have to darken the circle as indicated below


ˆ¤üÖÆü¸üÞÖ
on the correct response against each item.
•Ö²Ö×Ûúú(C) ÃÖÆüß ˆ¢Ö¸ü Æîü …
Example



5. ¯ÖÏ¿®ÖÖë Ûêú ˆ¢Ö¸ü Ûêú¾Ö»Ö ¯ÖÏ¿®Ö ¯Ö¡Ö I Ûêú †®¤ü¸ü פüµÖê ÝÖµÖê OMR ¯Ö¡ÖÛú ¯Ö¸ü Æüß
where is the correct response.

†Ó×ÛúŸÖ Ûú¸ü®Öê Æïü … µÖפü †Ö¯Ö OMR ¯Ö¡ÖÛú ¯Ö¸ü פüµÖê ÝÖµÖê ¾Öé¢Ö Ûêú †»ÖÖ¾ÖÖ Sheet given inside the Paper I Booklet only. If you mark
5. Your responses to the items are to be indicated in the OMR
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at any place other than in the circle in the OMR Sheet, it will
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not be evaluated.

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6. Read instructions given inside carefully.

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7. Rough Work is to be done in the end of this booklet.

8. µÖפü †Ö¯Ö OMR ¯Ö¡ÖÛú ¯Ö¸ü ×®ÖµÖŸÖ Ã£ÖÖ®Ö Ûêú †»ÖÖ¾ÖÖ †¯Ö®ÖÖ ¸üÖê»Ö
8. If you write your Name, Roll Number, Phone Number or
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put any mark on any part of the OMR Sheet, except for the
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space allotted for the relevant entries, which may disclose
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your identity, or use abusive language or employ any other
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unfair means, you will render yourself liable to
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disqualification.
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9. You have to return the test question booklet and Original
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OMR Sheet to the invigilators at the end of the examination
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compulsorily and must not carry it with you outside the
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Examination Hall. You are, however, allowed to carry
duplicate copy of OMR Sheet on conclusion of examination.

10.
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11.
×ÛúÃÖß ³Öß ¯ÖÏÛúÖ¸ü ÛúÖ ÃÖÓÝÖÞÖÛú (Ûîú»ÖÛãú»Öê™ü¸ü) µÖÖ »ÖÖÝÖ ™êü²Ö»Ö †Öפü ÛúÖ


10. Use only Blue/Black Ball point pen.
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11. Use of any calculator or log table etc., is prohibited.

12. ÝÖ»ÖŸÖ ˆ¢Ö¸üÖë Ûêú ×»Ö‹ ÛúÖê‡Ô †ÓÛú ÛúÖ™êü ®ÖÆüà •ÖÖ‹ÑÝÖê …
12. There is no negative marks for incorrect answers.


ELECTRONIC SCIENCE
Paper II

Note This paper contains fifty objective type questions, each question carrying two
marks. Attempt all the questions.

1. For a JFET IDSS 8 mA and peak voltage Vp what will be the
drain current for gate to source voltage of -2V

4.5 mA 8 mA


16 mA 12 mA



2. The leakage current in silicon p-n junction at room temperature is of the order of

mA .A


..A Amp



3. A tree in a network has a

closed path


no closed path


no nodes


no branches



4. In the given network, Z11 is equal to
image description
6
4 2
11 Ohm 11 Ohm

5. Which is a three-terminal negative voltage regulator IC

78 XX IC 723


LM 317 79 XX



6. Three identical stages have overall upper 3 dB frequency of 2 KHz and lower 3 dB frequency of 20 Hz. What is the value of fH of each stage

13 KHz 26 KHz


39 KHz 52 KHz



7. A combinational circuit has inputs B and C and its K-map is as shown, the output of the circuit will be
image description



B AB C





(AB AB) C





ABC


A . B . C



8. The output f of the 4-to-1 Mux shown in the given figure is
image description

xy

xx y


y xy



9. Microprocessor 8086 allows floating point arithmetic calculations in

Maximum mode


Minimum mode


Both maximum and minimum modes


Neither in maximum nor in minimum mode



10. Which of the following chip is used in 8085 microprocessor 3-chip configuration

IC 8255 IC 8155


IC 8251 IC 8257



11. C Language is a

High level language


Low level language


Machine level language


Middle level language



12. In a language expression, if the following expressions appear, which will be evaluated first

x y x . y


x/y




13. If E 2 v/m of a wave in free space, the value of magnetic field is

601 . A/m 60 . A/m


120 . A/m 240 . A/m



14. The radiation resistance of a Hertizian
.
dipole antenna of length 60 is

0.493 Ohm 0.22 Ohm


2.2 Ohm 22 Ohm



15. A 20 kW carrier is sinusoidally modulated by two carriers corresponding to modulation index of 30% and 40% respectively. The total radiated power is

25 kW 22.5 kW


45.0 kW 35.0 kW



16. ASCII code has 128 characters, which are binary coded. If a computer generates 106 characters per second, then minimum band width required to transmit this signal will be

1.4 mbps 14 mbps


7 mbps 0.7 mbps



17. When the current through SCR is greater than holding current, then the voltage across the SCR is

1.4 V


0 V


Supply voltage


Half the load voltage



18. Dispersion shifted wave length is

800 nm 1550 nm


1310 nm 1200 nm



19. The most suitable instrument for the measurement of voltage is

DVM


Analog voltmeter


CRO


DMM



20. The characteristic polynomial of a system is 2s5 s4 4s3 2s2 2s 1 The system is

Stable


Marginally stable


Unstable


Oscillatory



Directions
Q. 21 to 30 The following items consist of two statements, one labelled the "Assertion and the other labelled the "Reason You are to examine these two statements carefully and decide if the Assertion
and the Reason are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.
Codes

Both and are true and is the correct explanation of


Both and are true, but

is not correct explanation of


is true, but is false.


is false, but is true.



21. Assertion Tunnel diode provides oscillations in the microwave region.
Reason The equivalent RC model of tunnel diode gives frequency in the microwave region.

22.
Assertion The roots of the denominator of a network function decide its stability.

Reason The poles on real axis determine the damping factor of the system.


23.
Assertion The fast changing inputs do not depend upon slew rate property of an OPAMP.

Reason Schmitt trigger does not work on the slew rate property of an OPAMP.


24.
Assertion A parallel comparator ADC requires in built no. of comparators 2N 1.

Reason The speed of parallel comparator is limited by the speed of comparator.


25.
Assertion Microcontrollers are preferred in Real time applications.

Reason The on chip I/O integration has no bearing on the speed of microcontroller.


26.
Assertion In 'FORTRAN' pointers are provided.

Reason Pointers help to work with actual physical addresses.


27.
Assertion Divergence theorem is applicable for both static and time varying fields.


Reason It is used to find enclosed charge from the
knowledge of either D or
E.

28. Assertion The back e.m.f. of a
d.c. motor depends upon series winding and armature resistance.
Reason When there is no load, the back emf is minimum.

29.
Assertion By using wavelength division, multiplexing the capacity of an optical fibre can be enhanced.

Reason The separation between two adjacent channels in WDM is of the order of 50 nm.


30.
Assertion The sign of all terms in the first row of Routh's array are checked, for stability considerations.

Reason The number of sign changes equals the no. of roots on the right hand side of s-plane.


31.
Consider the following four transistors


1. CE mode 2. CC mode
3. MOSFET 4. FET
The correct order in which, the input impedance increases is

3 4


4 1



32. The correct order in which the power dissipation in transistor in power amplifiers decreases
1. Class A 2. Class C
3. Class B 4. Class AB The correct order is

2 and 4


4 and 2


4


1



33. The following are the interrupts of 8085 microprocessor
1. INTR 2. TRAP
3. RST 7.5 4. RST 5.5 The correct order in which these interrupts will be executed, if arrive simultaneously

4 4


1 3



34. The following are the oscillators
1.
Crystal

2.
Weinbridge

3.
Colpitt's

4.
Tunnel diode oscillator The correct sequence of decreasing order of the frequency of oscillation will be



2 3


1 1



35. Following are the controllers
1.
On-off

2.
PID

3.
PI The correct order of the decrease in error output is



3 2


1 2



Directions Q. Nos. 36 to 45 In the following questions, match List I and List II and select the correct answer using the codes given below the lists
36. List I List II
a.
P-N junction i. base width diode modulation

b.
BJT ii. AGC

c.
FET iii. mV/.C

d.
MOSFET iv. low power consumption


Codes
a b c d

i ii iii iv


ii i iii iv


iv i ii iii


iii i ii iv



37. List I List II
a.
Stability i. transient analysis

b.
Y-parameters ii. discrete time domain analysis

c.
Laplace iii. hybrid transform ..model

d.
Z-transform iv. location of poles


Codes

a b c d
iv iii i ii
iv iii ii i
iv ii iii i
i ii iii iv

38. List I List II
a.
Stability factor i. Large bandwidth

b.
Loop gain . 1 ii. Voltage divider bias

c.
Lock range iii. Oscillators

d.
Negative iv. PLL feedback


Codes
a b c d

ii iv iii i


ii iii iv i


iii iv ii i


i ii iii iv



39. List I List II
a.
Combinational i. Sequential logic circuits

b.
Counters ii. ROM

c.
LIFO iii. DVM

d.
State diagram iv. Shift register


Codes
a b c d

ii iii iv i


ii iv iii i


i ii iii iv


iv iii ii i



40. List I List II
a.
8085 i. variable port addressing

b.
8086 ii. serial communication

c.
8279 iii. register bank

d.
8051 iv. 2-key lockout


Codes
a b c d

i ii iii iv


iii ii i iv


ii iv i iii


ii i iv iii



41. List I List II
a.
while i. on-off control implementation

b.
paranthesis ii. infinite

c.
Switch-case iii. change of precedence

d.
If-then iv. multiple processing


Codes
a b c d

i ii iii iv


iii iv ii i


ii iii iv i


ii iv iii i



42. List I List II
i. continuity
a. .. equation
ii. current density
b.
..


iii. Faraday's law of
c.
..

induction
iv. Gausses lawd. ..
Codes
a b c d

i ii iii iv


ii iii iv i


ii iii i iv


iv i ii iii



43. List I List II
a.
QPSK i. deviation

b.
Hamming code ii. I.F.

c.
Superhetrodyne iii. Error correction

d.
Frequency iv. 90.modulation


Codes
a b c d

iv i ii iii


iv ii iii i


ii iii iv i


iv iii ii i



44. List I List II
a.
relaxation i. PWM oscillator

b.
S.M.P.S. ii. triac

c.
population iii. UJT inversion

d.
bi-directional iv. Laser control


Codes
a b c d

iii i iv ii


iii ii i iv


iv i ii iii


iii i ii iv



45. List I List II
a.
Strain i. Pt-100 measurement

b.
temperature ii. load cell measurement

c.
Lissajous iii. bio-medical figures signals

d.
E.M.G. iv. C.R.O.


Codes
a b c d

i ii iv iii


ii i iv iii


iii ii i iv


iii iv ii i



Read the passage below and answer the questions 46 to 50, that follows based on your understanding of the passage
Many instruments require dc power of their operation. This power is available from a portable cell, however, the power output is low besides other problems. AC power is continuously and easily available, so it is convenient to use it. However, ac power must be converted into dc power.
The devices such as half-wave, full wave and bridge rectifiers convert bi-directional voltage to uni-directional voltage. However, the output has large ripple contents. Filters are used to reduce the ripple significantly. Various filters circuits and LC and CLC. The power supply with rectifier and filter is still unregulated.
The output of such power supplies varies with variations in a.c. mains voltage, load current and temperature.
In order to maintain the output at constant level, voltage or current regulation is necessary. This is obtained by using series or shunt feedback. In addition to regulation, the power supply also requires protection e.g. overload, over current or short circuit protection. Pre- regulation is also carried out to improve the stability.
Regulators can be designed by using discrete components. However, IC regulators are also available. These regulators have facilities like

voltage current boosting


thermal shut-down


floating point to facilitate higher output voltage.
switching regulator to reduce the power dissipation.
46. The minimum supply voltage to operate IC 7815 is

15 V


17 V


25 V


40 V



47. In low voltage, low current model, IC 723 gives output voltage in the range of

2 to 7 V


5 to 10 V


0 to 10 V


0 to 7 V



48. For a d.c. output of 30 from a full wave rectifier, the PIV rating of the diode should be minimum

50 V


75 V


100 V


200 V



49. The critical inductance in mains power supply ensures that the current through never becomes zero. For this, critical value of inductance is
RL



310
RL



450
RL



620
RL



942

50. In series pass voltage regulator using zener diode, the function of zener diode is a

Voltage regulator


Voltage comparator


Breakdown diode


Temperature compensator



Space For Rough Work
Paper-II 8
D-88-12