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1. Write your roll number in the space provided on the topof this page.
2. Answer to short answer/essay type questions are to begiven in the space provided below each question orafter the questions in the Test Booklet itself.
No Additional Sheets are to be used.
3. At the commencement of examination, the questionbooklet will be given to you. In the first 5 minutes, youare requested to open the booklet and compulsorilyexamine it as below :
(i) To have access to the Question Booklet, tear off thepaper seal on the edge of this cover page. Do notaccept a booklet without sticker-seal and do notaccept an open booklet.
(ii) Tally the number of pages and number of questionsin the booklet with the information printed on thecover page. Faulty booklets due to pages/questionsmissing or duplicate or not in serial order or anyother discrepancy should be got replacedimmediately by a correct booklet from theinvigilator within the period of 5 minutes.Afterwards, neither the Question Booklet will bereplaced nor any extra time will be given.
4. Read instructions given inside carefully.
5. One page is attached for Rough Work at the end of thebooklet before the Evaluation Sheet.
6. If you write your name or put any mark on any part ofthe Answer Sheet, except for the space allotted for therelevant entries, which may disclose your identity, youwill render yourself liable to disqualification.
7. You have to return the test booklet to the invigilators atthe end of the examination compulsorily and must notcarry it with you outside the Examination Hall.
8. Use only Blue/Black Ball point pen.
9. Use of any calculator or log table etc., is prohibited.
J-8810 P.T.O.
Signature and Name of Invigilator Roll No.
(In words)
1. (Signature) __________________________
(Name) ____________________________
2. (Signature) __________________________
(Name) ____________________________
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J
PAPER-III
Test Booklet No.
[Maximum Marks : 200Time : 2 1/2 hours]
Number of Pages in this Booklet : 24 Number of Questions in this Booklet : 26
Instructions for the Candidates ¯Ö üß�ÖÖÙ£ÖµÖÖë �êú ×»Ö� ×Ö¤ìü¿Ö
(In figures as per admission card)
ELECTRONIC SCIENCE
8 8 1 0
J-8810 2
ELECTRONIC SCIENCE
PAPER – III
Note : This paper is of two hundred (200) marks containing four (4) sections. Candidates
are required to attempt the questions contained in these sections according to the
detailed instructions given therein.
J-8810 3 P.T.O.
SECTION – I
Note : This section consists of two essay type questions of twenty (20) marks each, to be
answered in about five hundred (500) words each. (2 ×××× 20 = 40 marks)
1. Discuss how the design is transferred from the initial art work to the final design on a
silicon wafer using photolithography technique.
OR
Write an essay on combinational logic.
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J-8810 4
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J-8810 5 P.T.O.
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J-8810 6
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2. Explain the applications of OPAMP as (i) adder, (ii) integrator, (iii) differentiator &
(iv) Schmitt trigger.
OR What are different methods to control speed of a dc motor ? Explain any one technique
in detail.
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J-8810 7 P.T.O.
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J-8810 8
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J-8810 9 P.T.O.
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J-8810 10
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SECTION – II
Note : This section contains three (3) questions of fifteen (15) marks each to be answered
in about three hundred (300) words. (3 ×××× 15 = 45 marks)
3. Explain with suitable diagram demultiplexing of AD0 – AD7 and formation of
Address, data and control buses for 8085.
4. (a) Calculate all the currents through the resistances and delivered by voltage
source of the following circuit. (10)
(b) Determine the Laplace Transform of following function
F(s) = s
(s + 2) (s + 1) (5)
5. Derive the value of numerical aperture and acceptance angle in a fiber optic
communition system. Discuss how the data rate increases with the change in the value
of numerical aperture ?
J-8810 11 P.T.O.
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J-8810 12
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J-8810 13 P.T.O.
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J-8810 14
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J-8810 15 P.T.O.
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J-8810 16
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J-8810 17 P.T.O.
SECTION – III
Note : This section contains nine (9) questions of ten (10) marks, each to be answered in
about fifty (50) words. (9 ×××× 10 = 90 marks)
6. The equivalent circuit of tunnel diode is shown below :
Calculate its input impedance.
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7. Define tree, cotree, nodes, loops and incidence matrix w.r.to the graph theory.
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J-8810 18
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8. Draw the structure of MOSFET and explain the threshold voltage for enhancement
mode and depletion mode MOSFET by drawing the transfer characteristics.
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9. How NAND gate works as a universal gate ?
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J-8810 19 P.T.O.
10. What is the difference between post-increment and pre-increment operations ?
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11. Define gain and radiant frequency of an antenna. Give one property of isotropic
antenna.
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J-8810 20
12. Explain the function of physical layer in data communication system.
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13. What do you mean by coherence ? Why LASER exhibits high degree of coherence ?
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J-8810 21 P.T.O.
14. What is the significance of hysteresis in ON-OFF controller ?
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SECTION – IV
Note : This section contains five (5) questions of five (5) marks each based on the following
passage. Each question should be answered in about thirty (30) words.
(5 ×××× 5 = 25 marks)
There are several conventional vacuum tubes and microwave tubes in common
use. The conventional vacuum tubes such as triodes, tetrodes and pentodes are still
used as signal source of low output power at low microwave frequencies. The most
important microwave tubes at present one two kavity klystron and reflex klystrons.
The advent of klystron amplifier began in 1939. The two cavity klystron is widely
used as microwave amplifier operated by principle of velocity and current
modulation. All electrons injected from cathode arrive at the first cavity with uniform
velocity and then pass through the second cavity. As a result of these actions the
electrons gradually bunched together as they travel down the drift space. In 1957, the
first solid state microwave devices was invented in 1957 and is called the tunnel
diodes. Tunnel diode is useful in microwave oscillators and amplifiers. It exhibits a
negative resistance characteristics in the region between peak current and valley
current.
J-8810 22
15. What is velocity modulation ?
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16. What is current modulation ?
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17. Discuss briefly the bunching process. How does it take place ?
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J-8810 23 P.T.O.
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18. Draw the current-voltage characteristics of tunnel diode and mark the tunnelling
current.
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19. Explain the operation of tunnel diode.
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Question
Number
Marks Obtained
FOR OFFICE USE ONLY
Total Marks Obtained (in words) ...........................................
(in figures) ..........................................
Signature & Name of the Coordinator ...................................
(Evaluation) Date .........................
J-8810 24
Marks
Obtained