Pondicherry University 2011 B.Tech Electronics and Communications Engineering - Electronics Circuits - Question Paper

PART-A (10*2=20 marks)

ans all ques.

1. elaborate the advantages of self bias?

2. What is the need for heat sink?

3. State the applications of emitter follower?

4. elaborate the parameters of FET?

5. elaborate alpha and beta cutoff frequencies?

6. What is the need for hybrid Pi transistor model?

7. elaborate the merits of cascade amplifier?

8. What is synchronous tuning?

9. describe efficiency of a rectifier.

10.Define line and load regulation.

PART-B (5*11=55 marks)

ans all questions, 1 from every unit

UNIT I

11. discuss the various kinds of biasing of BJT with neat diagrams.

or

12. Draw the fixed bias and self bias circuits using FET and discuss them in detail.

UNIT II

13. Compare and contrast all the parameters of CE, CC and CB-BJT amplifiers.

or

14. Draw the h-parameter equivalent circuit of CB-BJT. Derive expressions for input and output impedances, voltage and current gains.

or

15. Draw the hybrid pi model of BJT in CE connection and derive the formula for current gain

or

16. Derive the equations for alpha and beta cutoff frequencies in terms of transistor parameters.

UNIT IV

17. (a) discuss the significance of Direct coupling.
(b) discuss the working of cascade amplifier with a neat diagram and derive its overall voltage gain.

or

18. Draw a neat circuit diagram for a single tuned amplifier and discuss its working in detail.

UNIT V

19. Draw a diode centre tapped full wave rectifier and discuss it in detail. Derive its efficiency and ripple factor.

or

20. Write tech. notes on:
(a) Need for filters.
(b) Short circuit protection

Earning:   Approval pending.