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1. Write your roll number in the space provided on the topof this page.

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D-88-11 P.T.O.

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(In words)

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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¸üßõÖÖÙ£ÖµÖÖë Ûêú ×»Ö‹ ×®Ö¤ìü¿Ö

(In figures as per admission card)

ELECTRONIC SCIENCE

8 8 1 1

D-88-11 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.

Answer to all questions must be written in English only.

D-88-11 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. With the help of neat diagram, explain the operation of Hartley oscillator and explain

its working. Derive the expression for frequency of oscillation and condition for

starting of oscillations.

OR

Draw the pin diagram of 741 opamp. Explain its features and give details of three

applications.

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D-88-11 5 P.T.O.

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D-88-11 7 P.T.O.

2. Classify various instructions in 8085 microprocessors. Also discuss various

addressing modes with examples.

OR

Design a synchronous decade counter using J.K flip flops.

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D-88-11 9 P.T.O.

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D-88-11 11 P.T.O.

SECTION – II

Note : This Section Contains three (03) questions of Fifteen (15) marks each to be

answered in about 300 (three hundred) words. (3 ×××× 15 = 45 Marks)

3. What is need of modulation ? Compare different digital phase modulation techniques.

4. Explain SCR operation with the help of two transistor model. Derive expression for

gate current.

5. What are hybrid parameters in transistors ? Obtain expressions for hybrid parameters

for CE stape.

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D-88-11 13 P.T.O.

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D-88-11 15 P.T.O.

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D-88-11 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. Explain the operation of full wave bridge rectifier and also calculate the efficiency.

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7. Explain the steps for fabrication of a BJT.

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D-88-11 21 P.T.O.

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8. State and prove maximum power transfer theorem.

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9. Compare various features of a micro controller with a microprocessor.

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10. Determine the input impedance of a 50 ohm lossless transmission line of length 0.1 λ.

If it is terminated in an open circuit.

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D-88-11 24

11. What do you understand by quantization process ? How quantization errors can be

reduced ?

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12. Draw a single phase inverter using thyristors. How does it work ?

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D-88-11 25 P.T.O.

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13. Derive expression for Numerical aperture in optical fiber communication. What is its

physical significance ?

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14. What is pH ? How is it measured ? Explain

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D-88-11 27 P.T.O.

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)

Gunn effect is instrumental in the generation of microwave oscillators in bulk

semiconductor materials. GaAs and InP have been found to posses it. If a small dc

voltage is placed across a thin slice of GaAs, then negative resistance will manifest it

self under certain conditions. If the voltage gradient across the slice is in excess of

about 3300 V/cm. The oscillations will then occur, if the slice is connected to a

suitably tuned circuit. Because of high voltage gradient across the slice of GaAs

electron velocities are high, and the oscillations will occur at microwave frequencies.

It is seen that as the applied voltage rises past the negative – resistance value,

current falls, and thus the classical case of negative resistance is exhibited. The

oscillations observed in the GaAs slice have compatible with the formation and transit

time of electron bunches. This phenomenon leads to the formation of negative

resistance domains. As a good approximation, the equivalent circuit of a GaAs,

X-band Gunn diode consists of a negative resistance of about 100 ohms in parallel

with a capacitance of about 0.6 pF. Gunn oscillators, Gun amplifiers are used in broad

band operation. Gunn diodes are employed frequently as low and medium power

oscillators in microwave receiver instruments. Gunn diodes are also used in pump

sources, because of much lower noise. Further, PIN diodes are used as detectors at

microwave frequencies.

15. Differentiate between direct and indirect band gap semiconductors.

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D-88-11 28

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16. Explain in detail the Gunn effect.

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17. What are Gunn domains ?

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D-88-11 29 P.T.O.

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18. List five applications of microwaves.

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19. Explain the detection of microwaves using PIN diodes.

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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-88-11 32

Marks

Obtained