Previous years papers of electronic Devices & circuits CS-204

Dear Reader we are again with you with the important question asked in previous year examinations in subject EDC CS -204 . The paper is compiled and edited by E-infocomm Team .

 (2009)

Q1. Answer in brief –

1. Write the name of various capacitance of a p–n junction?

2. Why does thermal runaway not occur in FET?

3. How does light emit in LED?

4. What are photoconductors? Write the applications of it?

5. What do you mean by ‘Q’ point of a transistor?

                                                                                                                     (2x5)

Q2.

1. Describe in detail the working, characteristics curves and application of tunnel diode?

2. Explain the phenomenon of drift current and diffusion current in a semiconductor material and also write the various equations relaying with it?                     (6x2)

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                                                                                                        Compiled by : Divya Bhatnager

Q3.

1. How does transistor act as a switch and as an amplifier? Explain with suitable diagrams?

2. Draw the small signal model of BJT & JFET and write its equation?                                              (6x2)

Q4.

1. Find the various gains and I|O impedance of common emitter transistor amplifier.

Given

a)        η_fe = 50

b)        hoe=50*10^-6 A/v

c)        hie=1100 Ω

d)       hre= 2.5*10^-4

e)        R_s=1K Ω, R_L=10K Ω

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