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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034 B.Sc. DEGREE EXAMINATION – PHYSICS THIRD SEMESTER – APRIL 2008 PH 3106 - APPLIED ELECTRONICS Date : 29-04-08 Time : 1:00 - 4:00 Dept. No. FG 8 Max. : 100 Marks Part – A Answer ALL Questions. (10x2=20) 1. With neat Fermi diagrams explain what happens to the Fermi level when donors are added to an intrinsic semiconductor. 2. Write a note on Light Emitting Diodes. 3. State any four properties of an ideal Op-amp. 4. With a neat diagram, explain how an Op-amp may be used as an integrator. 5. What are don’t care states in K-maps? 6. Simplify A ( A B ) using Boolean identities. 7. Discuss the racing condition in a JK flip-flop. 8. Draw the circuit diagram of a three bit ring counter. 9. Write a note on the registers of the processor. 10. Write a note on the memory hierarchy in a computer. Part – B Answer any FOUR. (4x7.5=30) 11. With neat diagrams explain the working of common emitter and common base transistor amplifiers. 12. With a neat diagram, explain the working of a four bit binary weighted D/A convertor. 13. With neat diagrams explain how NAND gates may be used as universal building blocks. 14. With a neat diagram explain the working of an RS flip-flop. 15. Write notes on Cache and Virtual memories of a computer. Part – C Answer any FOUR. (4x12.5=50) 16. With a plot of the volt-ampere characteristics of a zener diode, explain how it may be used as a voltage regulator. 17. With neat diagrams, explain the working of a four bit counter A/D converter. 18. With circuit neat diagrams, explain the working of a full adder and a half subtractor. (7+5.5) 19. With neat circuit and wave diagrams explain the working of a four bit ripple counter. 20. Write notes on RAM, ROM, EEPROM, UVEPROM. (3+3+3+3.5) 1