UGC NET 2009: December, Paper III, Electronic Science
Text of page 1
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Test Booklet No.
D-8809
Time : 2 1/2 hours] PAPER-III [Maximum Marks : 200
ELECTRONIC SCIENCE
Number of Pages in this Booklet : 32 Number of Questions in this Booklet : 26
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D-8809 P.T.O.
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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-8809 2
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SECTION – I
Note : This section contains five (5) questions based on the following paragraph.
Each question should be answered in about thirty (30) words and carries five (5)
marks. (5 × 25 = 25 marks)
Transducers are energy converters. They are classified as passive and active. The transducers
can be electrical or mechanical. However, electrical transducers are preferred since signal
conditioning becomes easier. The important parameters for the selection of a transducer are
linearity, sensitivity, range repeatability size etc. The transduction involves the principle of
resistance, Inductance, Capacitance, photoemission, photo-resistance, thermo-electricity and
so on. Some examples of transducers are LVDT, strain gauge, RTD, Bourdon tube,
thermistors, photo-diode. The parameters measured with transducers are temperature,
pressure, level, flow, force and position etc.
At the input of any Data Acquisition System transducers are necessary.
1. What is a transducer ?
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D-8809 3 P.T.O.
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2. What is the advantage of using electrical transducers ?
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3. Which transducers are used to measure pressure ?
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D-8809 4
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4. Define the term linearity.
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5. What is the range of K-type and J-type thermocouples ?
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D-8809 5 P.T.O.
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SECTION – II
Note : This section contains fifteen (15) questions, each to be answered in about thirty
(30) words. Each question carries five (5) marks. (5 × 15 = 75 marks)
6. How does the junction capacitance vary with reverse voltage in a p-n junction diode ?
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D-8809 6
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7. Write the steps involved in fabrication of MOSFET devices.
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8. What is the concept of duality ? Write the duality for at least 5 electrical quantities.
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D-8809 7 P.T.O.
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9. What are h parameters ? State their importance.
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10. What is the difference between x ++ and ++ x ?
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D-8809 8
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11. What data types the bitwise operators can and cannot operate on ?
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12. What is Poynting Vector ? What is its physical importance ?
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D-8809 9 P.T.O.
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13. Write Maxwell’s equation in integral and differential forms.
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14. What is the principle of super heterodyne receivers ? Why it is preferred ?
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15. Compare ASK, FSK and PSK.
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16. State applications of Choppers.
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D-8809 11 P.T.O.
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1
17. Explain the meaning of 32 digit in multimeters.
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18. What are different methods of Blood Pressure measurements ?
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D-8809 12
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19. Explain the importance of derivative term in PID Controllers.
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20. State the Nyquist Criterion.
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D-8809 13 P.T.O.
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SECTION – III
Note : This section contains five (5) questions of twelve (12) marks each. Each question
is to be answered in about two hundred (200) words.
(12 × 5 = 60 marks)
21. Compare JFET with MOSFET. Draw I-V characteristics of depletion layer MOSFET
and explain the different parameters of MOSFET. What is the basic difference
between Depletion and Enhancement type MOSFETs ?
22. What is Modulus of a Counter ? Give design Mod-5 synchronous counter. Draw the
required timing diagrams.
23. (a) Write a program in ‘C’/C ++/FORTRAN, which implements On-off control or
proportional control.
(b) Write a program to swap the values stored in two variables.
24. (a) How bunching is formed in Klystron ? Explain.
(b) What are the applications of Smith chart ?
25. (a) Draw the functional block diagram of CRO and explain the function of sweep
generator. What is importance of compensated probes ?
(b) How phase measurements can be carried out with CRO ?
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D-8809 15 P.T.O.
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D-8809 19 P.T.O.
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D-8809 21 P.T.O.
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SECTION – IV
Note : This section consists of one essay type question of forty (40) marks to be
answered in about one thousand (1000) words on any one of the following
topics. (1 × 40 = 40 marks)
26. (a) Explain the difference between Zener and Avalanche breakdown mechanisms.
Draw I-V characteristics of a Zener diode and explain its parameters.
(b) What is Hall effect ? And derive the expression for Hall Voltage.
(c) What is a semiconductor diode laser ? Describe its structure and explain its
working.
(d) Explain the working principle of Electron microscope along with its diagram.
OR
(a) What is interfacing ? How is the incompatibility due to the following are
removed by interfacing
(i) voltage other than TTL ?
(ii) currents in excess of driving capacity of the bus ?
(iii) capacitive load greater than 100 pF ?
(b) Draw the circuit of a Schmitt Trigger and explain its working with suitable
waveforms.
(c) What are various digital modulation techniques ? Explain any one.
(d) Draw the structure of a stepper motor and explain its working principle along
with its industrial applications.
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D-8809 31 P.T.O.
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FOR OFFICE USE ONLY
Marks Obtained
Question Marks
Number Obtained
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Total Marks Obtained (in words) ...........................................
(in figures) ..........................................
Signature & Name of the Coordinator ...................................
(Evaluation) Date .........................
D-8809 32Official key not published for this paper.
Page 1 of 32
Source: University Grants Commission. Question paper published by University Grants Commission.