SRM University 2007 B.Tech Electronics and Communications Engineering EC202- ELECTRONIC CIRCUITS – II - Question Paper

20. What is Class-AB operation?
21. Explain the Q-point placement in Class-AB power amplifier with neat sketches of loadline.
22. What are the merits and demerits of class-AB power amplifier?
23. Mention a few of the important applications of Class-AB amplifier.
24. What is Class-D operation?
25. Compare the different power amplifier classes with respect to its operating cycle, position of Q-point and efficiency.
26. What are the disadvantages in Series fed, Directly coupled Class-A power amplifier?
27. What are the advantages & disadvantages in Transformer coupled Class-A power amplifier?
28. What is impedance transformation in case of a transformer? discuss the procedure of calculating a reflected load on primary for a step-down transformer.
29. What does the terms ‘complementary’ and ‘symmetry’ indicate?
30. What is the difference ranging from class-B and class-AB power amplifiers?
31. Draw the circuit diagram of push-pull amplifier. discuss why even harmonics are not current in a push-pull amplifier. provide 2 additional advantages of this circuit over that of a single transistor amplifier.
32. What are the advantages of push-pull circuit over that of a single transistor amplifier?
33. Which power amplifier provide minimum distortion? Why?
34. For the analysis of power amplifier why graphical techniques are used?
35. What is thermal resistance? discuss the thermal-electrical analogy related to a transistor with heat sink.
36. What is heat sink? What is its function?
37. Show mathematically, how class-B push-pull amplifier eliminates even-ordered harmonics.
38. Explain 2nd and 3rd harmonic generation in power amplifiers.
39. What is non-linear distortion in power amplifiers?

Part – B
1. Explain the working of Series fed, Directly coupled Class-A power amplifier with the help of a neat circuit diagram. provide the expression for dc power input, ac power output and efficiency?

2. Explain the working of Transformer coupled Class-A power amplifier with the help of a neat circuit diagram. provide the expression for dc power input, ac power output and efficiency?

3. Explain the working of Class-B power amplifier with the help of a neat circuit diagram.

4. What is crossover distortion? How can it be eliminated?

5. Explain the working of Class-B Push-Pull power amplifier employing input and output transformers with the help of a neat circuit diagram. explain its advantages and disadvantages.

6. Draw the circuit diagram of Class-AB complementary / symmetry power amplifier with its loadline and discuss its operation. provide the expression for dc power input, ac power output and efficiency?

7. (a) discuss the working of Class-C power amplifier with the help of a neat circuit
diagram. What is its drawback? Where can you use Class-C amplifiers?

(b) In class-C circuit the output current flows for a period less than 180o of the input
signal. How the signal is reconstructed at the output?

8. Write a short note on Class-D amplifier.
9. (a) What is harmonic distortion? How the output signal gets distorted due to
the harmonic distortion?
(b) What is the meaning of % harmonic distortion? How the total harmonic
distortion is calculated?

UNIT IV -TUNED AND WIDE BAND AMPLIFIERS
PART A
1. What is meant by tuned amplifiers?
2. What are the classifications of tuned amplifiers?
3. Draw the tuned circuit?
4. What are the classifications of tuned amplifiers according to the coupling used to compute the stages of multistage amplifiers?
5. What is single tuned amplifiers?
6. What is double tuned amplifier?
7. What is stagger tuned amplifiers?
8. What are the advantages & disadvantages of the tuned amplifiers?
9. What is gain bandwidth product?
10. Discuss the instability of tuned amplifiers?
11. A high Q circuit has ---------- selectivity.
12. What is meant by quality factor?
13. Give the expression for the quality factor?
14. Give the 3-dB bandwidth for resonant circuit?
15. Compare single-tuned and double-tuned amplifier?
16. Draw the output response of double tuned amplifier?
17. What is meant by video amplifier?
18. What are the designs considerations to be followed for video amplifier?
19. Draw the frequency response of video amplifier?
20. What are the features of CA3040 video amplifier?

PART B
1. Explain the working of single tuned amplifier with neat diagram?
2. Explain the working of double tuned amplifier with neat diagram?
3. With a neat sketch discuss the working of stagger tuned amplifier?
4. Differentiate ranging from single, double and stagger tuned amplifier?
5. Explain the working of CA3040 with neat circuit diagram?
6. Explain the working of MC1550 video amplifier with neat circuit diagram?
7. What is a cascade video amplifier? discuss the circuit with neat circuit diagram?


UNIT V-PULSE AND WAVESHAPING CIRCUITS
PART A
1. What is multivibrator?
2. How multivibrators are classified ?
3. What is astable multivibrator?
4. What is bistable multivibrator?
5. What is Monostable Multivibrator?
6. Draw the output waveforms of astable multivibrator?
7. Draw the output waveforms of bistable multivibrator?
8. Draw the output waveforms of monostable multivibrator?
9. What is the function of commutating capacitor ?
10. Write the applications of bistable , monosatble, astable multivibrator?
11. Draw the circuit of Schmitt trigger?
12. elaborate applications of Schmitt trigger?
11. What is lower threshold point in Schmitt trigger?
12. Which circuit is used as an amplitude comparator?
13. Draw the output waveforms of Schmitt trigger?
14. Which multivibrator is also known as free running multivibrator? Why?
15. What is meant by voltage-comparator?
16. Draw the circuit diagram of current switch comparator?
17. What is current time base generator? provide the types?
18. What is voltage time base generator? provide the types?
PART B
1. With neat circuit diagrams and waveforms define the operation of monostable multivibrator and derive the expression for pulse width.
2. Describe the operation of fixed bias bistable multivibrator with neat diagrams
3. Explain the working of self biased binary with the help of neat circuit diagram.
4. With complete circuit discuss the operation of a Schmitt trigger circuit
5. With neat circuit diagrams and waveforms define the operation of Collector coupled Astable multivibrator and derive the expression for Time period of the output waveform.
6. Explain the working of Miller time base generator?
7. Explain the working of Bootstrap time base generator?
8. Explain the working of current time base generator?
9. Explain voltage comparator circuits with neat diagrams?

Earning:   Approval pending.