Osmania University (OU) 2006-2nd Sem B.E Electronics & Tele-Communication Engineering 2/4 (E.C.E)(ESTER)SUPPLEMENTARY ,emr, Analog Electronic circuits - Question Paper

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B.E 2/4 (E.C.E)(II-SEMESTER)SUPPLEMENTARY EXAMINATION,December,2006
Analog Electronic circuits

FACULTY OF ENGINEERING

B.E. 2/4 (ECE) Ii Semester (Supplementary) Examination, December 2006 Subject: Analog Electronic Circuits

Time: 3 Hours} {Max. Marks: 75

Note : Answer Ail questions of Part - A and Answer any five questions

from Part-B. Assume any data if missing. LIBRARY

VI V S R Engg. Colleo*

PART - A (25 Marks) HYDERABAD

1. A negative feedback amplifier has a voltage gain of 60 db and uses

0.1 of the output voltage in the feedback. Calculate the gain with feedback in db. (3)

2. What are the advantages of crystal oscillator ? (2)

3. What are the methods of classification of tui ned amplifiers (3)

4. Define (i) Non-linear distortion (ii) Frequency distortion

(iii) Phase - shift distortion (3)

5. Define the terms collector dissipation and conversion efficiency. (2)

6. What are the merits and demerits of fixed voltage regulators. (2)

7. What are the advantages of double tuned amplifier ? (2)

8. Write various blocks of voltage series regulator. (3)

9. A FET RC phase shift oscillator circuit uses 3 RC sections in the feedback network containing R 10 M*rC * 0.005F. Determine

the frequency of oscillators. (2)

10. State the advantages erf complementary push-pull amplifiers over transformer compled push-puli amplifiers. (3)

PART-B (50Marks)

11. For the RC phase shift oscillator, briefly explain the operation and derive the expression for frequency of oscillations. (10)

12.(a) Derive the expression for the efficiency of class B push pull amplifier. (5)

(b) Derive the expression for Total harmonic distortion in power

amplifiers. (5)

13. A power transistor working as a class A amplifier has a supply voltage of 10 volts. If the maximum change in the collector current

in 500 mA, calculate the power transferred to a 8 ohms speaker, when

(i) The speaker is directly connected and

(ii) Speaker in connected through a 10:1 transformer. (10)

14. Discuss the principle of working of staggered tuning RF amplifier.

Explain the design details of such an amplifier. (10)

15. Design a series regulated power supply with the following specifications.

Unregulated input voltage = 30 v and r_D = 8 ohms Regulated output voltage = 12 v, max. load current = 200 mA Contra! transistor h*, = 100, h*^B 200 ohms Amplifier transistor hfc = 200, hj* * 1000 ohms Reference voltage VR = 6v, Zener resistance = 10 U Zener current = 20 mA

Also calculate its stability factor and output resistance.

16. For the transistor feedback amplifier and output figure, h 150, hto = 4.7 K while hie and hoe are negligible . Determine with R=1K O Rmf ⁸⁸ Vo/Is <ii) Ayf. VoA/_s (iii) R* <iv) R*

pVtc

WK ft**-