Sathyabama University 2008 B.E Electronics & Communication Engineering Electronic Circuits - I - Question Paper

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act, 1956)

 

Course & Branch: B.E ECE (Part Time)

Title of the paper: Electronic Circuits - I

Semester: I Max. Marks: 80

Sub.Code: 613PT102 (2006/(2007/2007 JAN/2008 JAN) Time: 3 Hours

 

PART A (10 x 2 = 20)

Answer All the Questions

1. Define ripple factors for a half wave and full wave rectifier.

 

2. Distinguish between shunt and series voltage regulators.

 

3. Define four h parameters.

 

4. Mention the necessity of biasing for BJT amplifier circuits.

 

5. Compare BJT and FET amplifier.

 

6. Draw small signal model of junction field effect transistors.

 

7. State Millers theorem.

 

8. Give the significance of coupling and bypass capacitor on bandwidth of amplifiers.

 

9. Define CMRR.

 

10. What are the advantages if differential amplifiers.

 

 

PART B (5 x 12 = 60)

Answer All the Questions

11. Draw the circuit diagram of FWR with capacitor filter. With suitable waveform explain its working; also derive equation for ripple factor.

(or)

12. a. With a neat sketch explain the switch mode power supply. (8)

b. Derive the ripple factor for L-C filters. (4)

 

13. Discuss in detail how the current gain, input impedance, voltage gain and output impedance of a transistor amplifier can obtained using h parameters.

(or)

14. With a help of neat diagram explain the voltage divider biasing method for BJT.

 

15. Analyze the depletion type and enhancement type of MOSFET using small signal model.

(or)

16. Draw the schematic of MOSFET power amplifier and explain how the heavy current flow does is accounted for.

 

17. Discuss the low frequency response and high frequency response of an amplifier.

(or)

18. Discuss the frequency response characteristic of RC coupled amplifiers. Derive the general expressions for gain at low, middle and high frequencies.

 

19. Draw the circuit diagram for differential amplifier using BJTs. Describe common mode and differential modes of working.

(or)

20. Explain the emitter coupled difference amplifier with neat diagram Write the improving methods of CMRR.