SRM University 2007 B.Tech Electronics and Communications Engineering BANK ELECTRONIC DEVICES - Question Paper

2. Give the diode current formula of PN junction diode.
3. Explain V-I characteristics of PN junction diode.
4. Explain Zener diode with V-I characteristics.
5. Explain TUNNEL diode with neat sketch and VI characteristics.
6. How is a PIN diode various from Semiconductor PN junction diode? discuss its operation with the help of VI characteristics?
7. Compare LED and LCD with sketch.
8. Derive the expression for Minority Carrier Concentration in a PN junction diode.
9. Explain about Varactor Diode.
10. Explain about Avalanche Breakdown and Zener Breakdown.
11. Write short notes on;
a) Photo Voltaic cell
b) Thermistor
c) LDR
12. discuss LED with a neat diagram.


























UNIT –III

PART A

1. What is the need for heat sinks?
2. How should the transistor be biased if it has to be operated in the cut off and saturation region?
3. CE configuration has got _____________ current amplification and _____________ voltage amplification.
4. What are h parameters of CB configuration?
5. Define storage time.
6. Draw the transistor as a switch.
7. Sketch typical common base characteristics of a pnp transistor.
8. Will a transistor outcome if 2 diodes are connected back to back?
9. State Early effect.
10. A Common base configuration transistor has a = 0.96 and IE = two mA. obtain its IC and IB
11. Give the relation ranging from a and ß.
12. Give the h parameters for a transistor circuit.
13. Explain the emitter and base regions of a transistor.
14. Give the relation ranging from emitter, collector and base currents.
15. A common Emitter configuration transistor has ß = 100 and IB = 50µA. compute the values of a , IC and IE .
16. A transistor will be in active region when ___________.
17. For power amplification which configuration is generally used.
18. Define rise time.
19. Define delay time.
20. How the transistor is affected by high frequency?
21. Among the three configurations (CB, CE, CC) which is having high current gain.
22. The hybrid pi model is also called ___________.
23. The transistor transconductance gm is ___________ proportional to current and _____________ proportional to temperature.
24. Mention a few applications of photoconductive cell.
25. A transistor will be in cutoff region when ___________.
26. What are the applications of common collector and common base configurations ?

Earning:   Approval pending.