ugc net electronic science exam
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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.
D-88-10 P.T.O.
Signature and Name of Invigilator
Roll No.
(In words)
1. (Signature) __________________________
(Name) ____________________________
2. (Signature) __________________________
(Name) ____________________________
Roll No.________________________________
D
PAPER-III
[Maximum Marks : 200Time : 2 1/2 hours]
Number of Pages in this Booklet : 32 Number of Questions in this Booklet : 19
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
D-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.
D-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 the structure and working of a Gunn diode and draw its I-V characteristics.
Mention the various conditions that must be satisfied by a band structure of
semiconductor to exhibit negative resistance.
OR
Explain programming model of 8086.
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D-8810 4
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D-8810 5 P.T.O.
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D-8810 6
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D-8810 7 P.T.O.
2. Explain in detail different digital modulation techniques. What is the necessity of
modulation ?
OR
What are different types of oscilloscopes ? And explain the working of C.R.O.
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D-8810 8
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D-8810 9 P.T.O.
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D-8810 10
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D-8810 11 P.T.O.
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. For n-channel silicon JFET with ND = 1016 cm–3, NA = 1019 cm–3, a = 1 µm, L = 20 µm,
Z = 100 µm and µn = 1350 cm2/vs. Find out the pinch off voltage and pinch off
current.
4. Write a program in C or Fortran which calls a function that returns square of a
number entered through a keyboard.
5.
In the above figure, find the gain K that results in marginal stability. Determine the
oscillation frequency.
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D-8810 12
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D-8810 13 P.T.O.
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D-8810 14
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D-8810 15 P.T.O.
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D-8810 16
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D-8810 17 P.T.O.
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D-8810 18
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D-8810 19 P.T.O.
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D-8810 20
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. Thevenise the circuit across terminals AB of the following circuit.
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D-8810 21 P.T.O.
7. Draw an energy band diagram of an ideal MOS structure at V = 0 for (a) n-type and
(b) p-type semiconductor MOS.
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8. What is an address operator in C ? Explain its use.
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D-8810 22
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9. What is difference in execution of conditional jump instruction when the jump
condition is true and not true ?
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D-8810 23 P.T.O.
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10. Explain fan-out for CMOS and TTL logics. What is significance of fan-out ?
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D-8810 24
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11. Explain companding in PCM system.
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D-8810 25 P.T.O.
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12. Define Poynting Vector. What is the significance of Poynting theorem ?
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D-8810 26
13. Draw the characteristics of UJT and indicate VP and VV and give their significance.
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14. What is the principle used in Blood Pressure measurement ?
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D-8810 27 P.T.O.
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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)
The read type diodes with n+ – p – i – p+ or p+ – n – i – n+ structures are also called
IMPATT diodes. Its physical mechanism is the interaction of impact ionization
avalanche and the transit time of charge carriers and the diode exhibits a differential
negative resistance by two effects. The first IMPATT operation reported was obtained
from a simple p-n junction. From the small signal theory it has been confirmed that a
negative resistance of the IMPATT diode can be obtained from a junction diode with
any doping profile. Many IMPATT diodes consist of a high doping avalanching
region followed by a drift region where the field is low and the carriers can traverse
without avalanching. Some of the structures are : one sided abrupt p-n junction, the
D-8810 28
linearly graded p-n junction and p-i-n diode. The principle of operation of these
diodes are essentially the same.
15. What is impact ionisation avalanche effect ?
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16. What is the transit time effect ?
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D-8810 29 P.T.O.
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17. Give the structure and doping profile of linearly graded p-n junction.
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18. What is the structure and doping profile of a p-i-n diode ?
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D-8810 30
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19. What is the doping profile of p- π -n and p- ν -n diode ?
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D-8810 31 P.T.O.
Space For Rough Work
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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 .........................
D-88-10 32
Marks
Obtained