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EC1209-ELECTRON DEVICES AND CIRCUIT

KINGS COLLEGE OF ENGINEERING, PUNALKULAM

KINGSCOLLEGE OF ENGINEERING

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

QUESTION BANK

NAME OF THE SUBJECT: EC 1209 ELECTRON DEVICES & CIRCUITS

YEAR / SEM: II / III

UNIT I

SEMICONDUCTOR DIODE AND BJT

PART A (2 MARKS)

1. Give the value of Charge, Mass of an electron.2. Define Electron volts.3. What is atomic number?4. What are valence electrons?5. What is forbidden energy gap?6. What are conductors? Give examples?7. What are insulators? Give examples?8. Give the energy band structure of conductor.9. What are Semiconductors? Give examples?10. What are the types of Semiconductor?11. What is Intrinsic Semiconductor?12. What is Extrinsic Semiconductor?13. What are the types of Extrinsic Semiconductor?14. What is P-type Semiconductor?15. What is N-type Semiconductor?16. What is doping?17. Which charge carriers is majority and minority carrier in N-type Semiconductor?18. Which charge carriers is majority and minority carrier in P-type Semiconductor?19. Define drift current?20. Define mean life time of a hole or and electron.21. What is the other name of continuity equation? What does it indicate?22. What is depletion region in PN junction?23. Give the other names of depletion region?24. What is barrier potential?25. What is meant by biasing a PN junction?26. What are the types of biasing a PN junction?27. What is forward bias and reverse bias in a PN junction?


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28. What is meant by reverse recovery time?29. What are break down diodes?30. What is break down? What are its types?31. What is zener breakdown?32. What is avalanche break down?33. What is a tunnel diode?

34. What is tunneling phenomenon?35. What is a schottky diode?36. Why do we choose q point at the center of the load line?37. List out the different types of biasing.38. What do you meant by thermal runway?39. Why transistor called a current controlled device?40. 40 .Define current amplification factor?41. What are the requirements for biasing circuits?42. When does a transistor act as a switch?43. What is biasing?44. What is operating point?

45. What is stability factor?46. What is d.c load line?47. What is a.c load line?

PART B

1. Explain Insulator, Semiconductor & conductor with help of energy band structure. (1

2. Explain the forward and revere bias operation and VI characteristics of a PN junctiondiode. (1

3. (a) Derive the current equation. ((b) Discuss the current components of PN junction diode. (

4. Explain the characteristics and applications of varactor diode. (1

5. (a) Explain the characteristics and applications of zener diode. ((b) Explain the mechanism of avalanche and zener break down. (

6. Explain the working principle & characteristics of tunnel diode. (1

7. Explain the structure, characteristics and applications of Schottky diode. (1

8. Explain the operation of PNP & NPN transistor. (1

9. Explain the input and output characteristics of CE configurations in NPN transistors.(1


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UNIT II

FET, UJT & SCR

PART A (2 MARKS)

1. What is meant FET?2. Define cutoff voltage.3. What does UJT stands for? Justify the name UJT.4. Give the symbol and structure of UJT.5. Give the equivalent circuit of UJT.6. Give the VI characteristics of UJT.7. What is a TRIAC?8. Give the symbol and structure of TRIAC.9. Give the application of TRIAC.10. What is a DIAC?

11. Give some applications of DIAC.12. Give the basic construction and symbol of DIAC.13. What is a SCR?14. Define break over voltage of SCR.15. Why SCR cannot be used as a bidirectional switch.16. Give the construction and symbol of SCR.17. How turning on of SCR is done?18. How turning off of SCR is done?19. Define holding current in a SCR.20. List the advantages of SCR.21. List the application of SCR.

22. What is meant by latching?23. List the important ratings of SCR.24. Compare SCR with TRIAC.25. Differentiate BJT and UJT.26. What is a thyristor?27. What are the types of thyristors?28. Give the various triggering devices for thyristors.29. Power MOSFET is a voltage controlled device. Why?30. What are the different types of power MOSFET?

PART B

1. Compare the following.i. DMOSFET & EMOSFET (ii. N-channel MOSFET & P-channel MOSFET. (

2. Explain the biasing technique for JFET. (1

3. Explain the construction and characteristics of JFET. (1


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4. Explain the construction and characteristics of EMOSFET. (1

5. Explain the construction and characteristics of DMOSFET. (1

6. Explain the biasing characteristics of MOSFET. (1

7. Explain the working and principle of operation of UJT and mention its applications.(16

8. Explain the working and characteristics of SCR and its applications. (1

9. Briefly explain the following.i. DIAC (ii. TRIAC (

UNIT III

AMPLIFIERS

PART A (2 MARKS)

1. What is an amplifier?2. How are amplifiers classified according to the input?3. How are amplifiers classified according to the transistor configuration?4. What is the different analysis available to analyze a transistor?5. Briefly define about class B amplifier6. What is cross over distortion?7. Define Common Mode Rejection Ratio.

8. How can a DC equivalent circuit of an amplifier be obtained?9. Define h parameters.10. Mention the advantages of Push pull amplifier11. What is need of Complementary symmetry amplifiers?

PART B

1. Explain the midband analysis of single stage CE, CB and CC amplifiers. (1

2. Explain the analysis of low frequency response RC coupled amplifiers. (1

3. Explain the classification of power amplifiers. (1

4. Explain complementary and symmetry amplifiers. (1

5. (a) How to eliminate the cross over distortion. ((b) Explain the heat sink design. (

6. Explain the hybrid parameter representation of transistor. (1


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UNIT V

PULSE CIRCUITS AND POWER SUPPLY

PART A (2 MARKS)

1. What is a Multivibrator?2. What is Astable Multivibrator?3. What is a monostable Multivibrator?4. What is the type of feedback used in an op-amp Schmitt trigger?5. List the important characteristics of a voltage regulator.6. What is a Schmitt trigger?7. What is ripple factor?8. Define peak inverse voltage.9. What is Transformer utilization factor?10. Define filter.

PART B

1. Explain the operation of FWR with neat circuit diagram and waveforms and derive IdcIrms, Vdc and Vrms. (1

2. Explain the operation of a capacitor filter with FWR & derive ripple factor. (1

3. Explain the series and shunt voltage regulators. (1

4. Explain the block diagram of SMPS and its operation with neat sketch. (1

5. Explain the principle of operation of Schmitt triggers. (1

6. Explain the operation and characteristics of UJT saw tooth oscillators. (1

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