Field Effect Transistors: Important Part B Questions

Electron Devices

Chapter 5: Field Effect Transistors

Important Part B Questions

1. What is FET?

2. What is JFET ?

3. List important features of FET.

4. Give the classification of FET.

5. Explain with neat sketch construction of n‒channel FET. Give also its symbol.

6. Explain with neat sketch construction of p‒channel FET. Give also its symbol.

7. Explain the operation of n‒channel FET.

8. Sketch a block diagram to represent an n‒channel FET. Indicate voltage and current direction and the device operation.

9. Explain JFET as voltage controlled current source.

10. Explain the working of p‒channel FET.

11. With neat diagram explain the construction, working principle of p‒channel JFET.

12. Illustrate the working mechanism of JFET with necessary diagram.

13. Sketch and explain the drain characteristics for an n‒channel FET.

14. Draw a circuit diagram to obtain the drain characteristics for an n‒channel JFET. Thus draw drain characteristics and explain them.

15. Explain the drain characteristics for p‒channel FET.

16. Explain the transfer characteristics for n‒channel JFET.

17. Explain the transfer characteristics for p‒channel JFET.

18. What do you understand by 'pinch off voltages' and 'cut‒off voltages'?

19. Draw a circuit for obtaining drain and transfer characteristics for an n‒channel JFET.

20. Sketch a typical drain characteristic for an n‒channel JFET. Explain the shape of the characteristic and identify the regions.

21. Sketch the basic circuits for both N channel JFET and P‒channel JFET.

22. Sketch and explain the drain‒characteristics and transfer‒characteristics of P‒channel JFET.

23. When a FET acts as a voltage variable resistor?

24. Explain the four distinct regions of the output characteristics of the JFET.

25. Discuss the drain and transfer characteristics of JFETS.

26. Derive the expresion for pinch‒off voltage.

27. Sketch a typical transfer characteristic for an n‒channel JFET and show how the transconductance gm can be derived from the transfer characteristic.

28. Define the following parameters of JFET :

i) Transconductance

ii) Drain resistance

iii) Amplification factor

iv) Power dissipation.

29. Write the equation for drain current of JFET.

30. Compare BJT and FET.

31. State the applications of JFET.

32. Briefly describe some applications of JFET.

33. Discuss your understanding on MOSFET detailing the types, construction and characteristics.

34. Explain the construction, operation and characteristics of n‒channel depletion type MOSFET.

35. Define transconductance.

36. With the help of suitable diagrams explain the working of different types of MOSFET.

37. Sketch the graph symbol for n ‒ channel and p channel MOSFET.

38. Discuss your understanding on MOSFET detailing the types, construction and characteristics.

39. Describe the output and transfer characteristics of MOSFET.

40. Define threshold voltage.

41. Define pinchoff voltage.

42. Sketch and explain the construction of N‒channel enhancement type MOSFET. Give also its symbol.

43. Explain the operation of an enhancement type MOSFET.

44. Describe, with suitable sketches, the operation and characteristics (transfer, drain) of the N‒channel enhancement type MOSFET.

45. With the help of suitable diagrams explain the working of different types of MOSFET.

46. Draw a circuit diagram of the cross section of a enhancement MOSFET. Also discuss the drain and transfer characteristics for EMOSFET.

47. Explain the concept of threshold voltage in a MOSFET.

48. Discuss the characteristics of MOSFET.

49. Describe the working and characteristics of MOSFET, D MOSFET and E MOSFET.

50. Discuss your understanding on MOSFET detailing the types, construction and characteristics.

51. What is channel length modulation.

5. State true or false: The transconductance increases if channel length is reduced.

53. Discuss the effect of channel length modulation.

54. Give comparison between JFET and MOSFET.

55. Differentiate between enhancement‒type and depletion‒type MOSFETs.

56. Give comparison between N‒channel and P‒channel MOSFET.

57. Compare p‒channel and n‒channel JFET.

58. Give the comparison between BJT and MOSFET.

59. Write a note on MOS capacitor.

60. What is n‒MOS and p‒MOS?

62. State advantages and disadvantages of n‒MOS.

63. State advantages and disadvantages of p‒MOS.

64. Explain the nMOS inverter.

65. Explain the pMOS inverter.

66. What is CMOS technology.

67. State advantages and disadvantages of CMOS technology.

68. Explain the CMOS inverter.

69. Sketch the typical transfer characteristics of a CMOS inverter.