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Model Questions for 3rd(IIIrd) semester
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1.Model Question - 1
2.Model Question 2.
14031 Electronic Devices and Circuits
MODEL QUESTION PAPER - I
Total Marks: 75
PART – A
Answer all questions 10 x 1 = 10 marks
1. Distinguish between a Rectifier and a Zener
2. Define rectifier efficiency.
3. Mention the application of an Emitter follower.
4. What are current and voltage gain of common emitter configuration
5. What is Barkhausen critierion .
6. Define intrinsic stand off ratio
7. What is meant by controlled rectifier?
8. State application of TRIAC.
9. What are the two types of LCD?
10. What is meant by DC restorer?
PART – B
Answer all questions. 5 x 3 = 15 marks
11.How to identify the value of a resistor? And What is PIV of Bridge Rectifier?
12.Describe the features of common Base configuration, What is meant by negative feed
back?
13. What are the conditions for oscillations? And compare FET and BJT.
14. Explain (a) Firing angle and (b) Conduction angle of an SCR.
15. What is meant by IGBT? Explain
PART – C
Answer any one from each question 5 x 10 = 50 marks
16. (a) Explain the operation of Zener diode. Distinguish between avalanche and
zener breakdown.
or
(b) With suitable sketches, explain the operation of full wave rectifier.
17. (a) Explain the input and output characteristics of common emitter configuration.
or
(b) Explain the principle of emitter follower and its application.
18. (a) Explain the operation of Hartley oscillator
or
(b) With suitable sketches, explain the operation of FET amplifier.
19. (a) Explain the operation of SCR under two transistor analogy and draw the VI
characteristics of SCR.
or
(b) What is a Triac? Sketch its characteristics and describe its operation.
20. (a) Describe the principle of operation of an avalanche photo-diode and mention
its application.
or
(b) With suitable sketches, explain the operation of monostable multivibrator
14031 ELECTRONIC DEVICES AND CIRCUITS
MODEL QUESTION PAPER - II
Total Marks : 75
PART – A
Answer all question 10 x 1 = 10marks
1. Define Ripple factor.
2. Define cutin voltage.
3. What are current gain and voltage gain of CB configuration.
4. State the advantage of self bias.
5. What is meant by Pinch-off voltage?
6. State any Two difference between BJT and FET.
7. Distinguish JFET and MOSFET.
8. State any two application of MOSFET.
9. Distinguish between clipper and clamper.
10. Differentiate between astable and monostable multivirator.
PART – B
Answer all questions. 5x 3 = 15 marks
11. What is zener breakdown? Explain the operation of limit switch.
12. What is the need for biasing a transistor?
13. Draw an LC oscillator.
14. What are the feature of SCR and Triac
15. What is meant by opto coupler.? Mention its applications.
PART – C
Answer any one from each question 5 x 10 = 50 marks
16. (a) Describe the action of PN junction diode under forward and reverse bias.
or
(b) With suitable sketches, explain the operation of a bridge rectifier.
17. (a) Draw and explain the operation of common collector configuration.
or
(b) Discuss the switching characteristics of a transistor for a pulse input.
18. (a) Explain the operation of RC phase shift oscillator.
or
(b) Draw the equivalent circuit of UJT and explain its operation, with the help of
emitter characteristics.
19. (a) Explain the speed control of fan using Diac and Triac.
or
(b) What is an IGBT? Sketch its construction and describe its operation.
20. (a) Describe the principle of operation of an LCD.
or
(b) With suitable sketches, explain the operation of an astable multivibrator.
