Download PTU B-Tech ECE 2020 Dec 3rd Sem 76444 Electronic Devices Question Paper

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B.Tech. (ECE) (2018 Batch) (Sem.-3)

ELECTRONIC DEVICES

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Subject Code : BTEC-301-18

M.Code : 76444

Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

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2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

Write briefly :

1. Describe the behaviour of p-n junction diode under forward and reverse biased conditions.

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2. Define the terms Knee voltage (VC) and Breakdown voltage (VB).
3. Compare and contrast between P-N junction diode and Zener diode.
4. Derive the relation between a and ß with respect to BJT.
5. Mention any two advantages of MOSFET over JFET.
6. Give reasons why common emitter (CE) configuration is widely used in amplifier circuits?

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7. What is reverse saturation current?
8. What is ripple factor?
9. In a bipolar transistor which region is wider and which region is thinner? Why?
10. How implant damage is repaired by annealing?

SECTION-B

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11. Illustrate and explain the energy bands of gallium arsenide and silicon semiconductors.
12. What is P-N junction diode? How potential barrier is formed in a P-N junction diode?
13. What is the difference between centre-tapped full-wave rectifier and bridge full-wave rectifier?
14. Draw Ebers-Moll model and hence explain transistor action.
15. What do you mean by oxidation process? Explain in detail. Also give characteristics of different oxide films.

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SECTION-C

16. In a CE configuration, the collector supply voltage is 10 V. When a resistor RC =1 kO is connected in the collector circuit, the voltage drop across it is 0.5 V. For a = 0.98, determine the collector-emitter voltage and the base current.
17. Explain the operation of a tunnel diode. Draw its V-I characteristics and list the possible applications of the device.
18. How doping is done using Ion implantation? Draw and explain the working of ion implanter.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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