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ec ld lab viva questions with answers
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ec ld lab viva questions with answers
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30-11-2015, 12:16 PM
Electronc circuits and logic design lab viva questions along with answers
jaseela123
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03-04-2017, 04:30 PM
Electronic Circuit Laboratory viva question
1. Define the voltage of a diode's knee.
2. Draw the VI characteristics of the junction diode pn.
3. Although the zener diode is operated in reverse decomposition
Region, but it does not burn. Why?
4. Differentiate between static and dynamic resistance of a diode.
5. Differentiate between avalanche and zener degradation.
6. Draw the VI characteristics of an ideal diode.
7. Draw the circuits of the CB, CE and CC configurations using the npn transistor.
8. What do you understand per point of operation?
9. Why do we choose the Q point in the center of the load line?
10. Name the two techniques used in the stability of the point .explain.
11. Define the stability factor and give the expression for the stability factor?
12. List the different types of bias.
13. What do you mean by thermal track?
14. Why is the transistor called a current controlled device?
15. Define the current amplification factor?
16. What are the requirements to polarize circuits?
17. When does a transistor act as a switch?
18. What is bias?
19. What is a point of operation?
20. What is the load line d.c?
21. Explain about the various regions of a transistor?
22. Explain about the characteristics of a transistor?
23. Why is the operating point selected in the center of the active region?
24. What is an amplifier?
25. What is the small signal amplifier?
26. What is a Darlington pair?
27. Define the common mode rejection relationship.
28. What is meant by a differential amplifier?
29. What does a balanced and unbalanced production mean?
30. What are the methods for improving CMRR?
31. Give few applications of differential amplifier
32. What is the need for the heat sink?
33. Compare the characteristics of the three configurations of the transistor.
34. Compare the characteristics of the three configurations of the transistor.
35. Why is the base thin and slightly doped?
36. Explain why an ordinary transistor is called bipolar.
37. Why is a current controlled device called a transistor?
38. Why is the collector region larger than the emitter region?
39. Draw the basic structure of a N-channel junction field effect transistor.
40. Why is FET known as a unipolar device?
41. What are the advantages and disadvantages of JFET over BJT?
42. What is a channel?
43. Distinguish between JFET and MOSFET.
44. What is a cascade effect?
45. What are all the factors that affect the bandwidth of the CR?
46. Amplifier coupled?
47. Explain the bypass capacitor?
48. What is the coupling capacitor?
49. Why is the gain of the amplifier reduced?
50. Explain the different regions in the frequency response?
51. What are the types of distortion in the amplifier?
52. What is cross-distortion? How can it be eliminated?
53. Define noise?
54. Define the response to the step?
55. Draw the JFET and MOSFET symbol.
56. What are the two modes of MOSFET?
57. Define the pinch-off voltage
58. What is feedback and what are feedback amplifiers?
59. What is meant by positive and negative feedback?
60. What are the advantages and disadvantages of negative feedback?
61. Differentiate between voltage and current feedback in amplifiers?
62. Define sensitivity?
63. Define De-sensitivity?
64. What is the type of feedback used in a Schmitt opamp trigger?
65. Give the expression of the oscillation frequency in an op-amp sine wave.
66. oscillator?
67. What are the conditions for the sustained oscillator or what is the Backhouse criterion?
68. What is the oscillator circuit?
69. What are the classifications of oscillators?
70. What are the types of feedback oscillators?
71. Define the piezoelectric effect?
72. Draw the equivalent circuit of the crystal oscillator?
73. What is the Miller crystal oscillator? Explain how it works?
74. Specify the frequency for the RC phase change oscillator?
75. Give topology of current amplifier with current bypass feedback?
76. What are margin of profit and margin of phase?
77. What is the minimum value of hfe for the oscillations in the transistor RC?
78. Phase Shift Oscillator?
79. What is the LC Oscillator?
80. Draw the circuit of the clapp oscillator?
81. How does an oscillator differ from an amplifier?
82. Do you name two low-frequency oscillators?
83. What is the AB class operation?
84. Define the conversion efficiency of a power amplifier. What is its value for class C.
85. power amplifier?
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