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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-8809 P.T.O.

Signature and Name of Invigilator Roll No.

(In words)

1. (Signature) __________________________

(Name) ____________________________

2. (Signature) __________________________

(Name) ____________________________

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D-8809

PAPER-III

Test Booklet No.

[Maximum Marks : 200Time : 2 1/2 hours]

Number of Pages in this Booklet : 32 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

D-8809 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-8809 3 P.T.O.

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 4

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 5 P.T.O.

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 6

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 7 P.T.O.

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 8

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 9 P.T.O.

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 10

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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D-8809 11 P.T.O.

15. Compare ASK, FSK and PSK.

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16. State applications of Choppers.

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D-8809 12

17. Explain the meaning of 31

2 digit in multimeters.

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18. What are different methods of Blood Pressure measurements ?

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D-8809 13 P.T.O.

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 14

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 16

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D-8809 17 P.T.O.

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D-8809 18

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D-8809 19 P.T.O.

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D-8809 20

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D-8809 21 P.T.O.

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D-8809 22

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D-8809 23 P.T.O.

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D-8809 24

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 25 P.T.O.

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D-8809 26

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D-8809 27 P.T.O.

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D-8809 28

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D-8809 29 P.T.O.

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D-8809 30

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D-8809 31 P.T.O.

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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-8809 32

Marks

Obtained