Wednesday, December 7, 2011

Electronics Device and Circuit

                                    

Viva  Questions

1.    Why silicon is preferred over germanium in the construction of diode ?
2.    What is the effect of temperature on  the diode ?
3.    Explain the following terms:
(a) static resistance
(b) bulk resistance
(c) junction resistance
(d) a.c. or dynamic resistance
(e) reverse resistance of diode
4.    What are the applications of a diode?
5.    What is the diode current equation?
6.    What is the difference between Drift current and Diffusion current?
7.    What is reverse saturation current ?
8.    What is reverse recovery time?
9.    Draw the symbols of all types of diodes?
10. What is the difference between zener breakdown & avalanche breakdown?
11. Draw the zener diode equivalent circuit?
12. What are the applications of zener diode?
13. What is the difference between zener diode & general diode?
14. What is the difference between zener break down & avalanche break down?
15. Explain the working of zener diode as a regulator?
16.  Draw the input/output characteristics of CB configuration of transistor?
17.  Define the current gain for CE configuration & CB configuration?
18.  Drive the relationship between α and β?
19.  Compare the performance of CB , CE & CC configuration on the basis of :
20.  Input resistance
21.  Output resistance
22.  Current gain
23.  Voltage gain
24.  5. Explain the term base-width modulation or early effect?
25.  6. Why CE is preferred over CB & CC configuration?
26.  7. What is phototransistor?
27.  8. Differentiate emitter, base & collector on the basis of their construction?
28.  9. What is heat sink?
29.  10. Draw the current analogy of the PNP transistor?
30. Exlapin FET(Field effect transistor)?
31. Explain JFET(junction field effect transistor)?
32. Compare FET(Field effect transistor) with BJT(Bipolar junction transistor)?
33. What is the difference between enhancement MOSFET & depletion MOSFET?
34. Draw the symbol of enhancement MOSFET & depletion MOSFET?
35. What is the advantage of enhancement MOSFET over depletion MOSFET?
36. Draw the transfer characteristic of  depletion MOSFET?
37. What is inversion layer?
38. Explain threshold voltage?
39. What are the applications of MOSFET?
40. Explain sinusoidal or harmonic oscillator & non sinusoidal oscillator?
41. Explain various types of sinusoidal oscillator?
42. Explain tank circuit?
43. Explain barkhausen  criterion?
44. What is the meaning of feedback?
45. Explain  positive feedback & negative feedback?
46. What are the advantages & disadvantages of negative feedback?
47. What are the advantages & disadvantages of positive feedback?
48. What is the application of sinusoidal oscillator?
49. Explain damped oscillation & undamped oscillation?
50. Why operational amplifier is called the operational amplifier?
51. What are the ideal characteristics of the operational amplifier?
52. What do you mean by slew rate?
53. Define common mode rejection ratio?
54. What is the importance of common mode rejection ratio (CMMR)?
55. What is the difference between the Integrator and differentiator?
56. What do you mean by input offset voltage?
57. What do you mean by input offset current?
58. What is the bias current?
59. What do you mean by differential amplifier?



Monday, December 5, 2011

DIGITAL ELECTRONICS LAB VIVA QUESTIONS

DIGITAL ELECTRONICS LAB VIVA QUESTIONS


VIVA QUESTIONS
Q.1 What do you mean by Logic Gates?
Q.2 What are the applications of Logic Gates?
Q.3 What is Truth Table?
Q.4 Why we use basic logic gates?
Q.5 Write down the truth table of all logic gates?


VIVA QUESTIONS
Q.6 What do you mean by universal gate?
Q.7 Write truth table for 2 I/P OR, NOR, AND and NAND gate?
Q.8 Implement all logic gate by using Universal gate?
Q.9 Why is they called Universal Gates?
Q.10 Give the name of universal gate?

VIVA QUESTIONS
Q.1 Draw circuit diagram of Half Adder circuit?
Q.2 Draw circuit diagram of Full Adder circuit?
Q.3 Draw Full Adder circuit by using Half Adder circuit and minimum no. of logic
gate?
Q.4 Write Boolean function for half adder? Q.5 Write Boolean function for Full
adder?
Q.5Design the half Adder & Full Adder using NAND-NAND Logic.


VIVA QUESTIONS
Q.1 Draw circuit diagram of Half Subtractor circuit?
Q.2 Draw circuit diagram of Full Subtractor circuit?
Q.3 Draw Full Subtractor circuit by using Half Subtractor circuit and minimum
       no. of logic gate?
Q.4 Write Boolean function for half Subtractor?
Q.5 Write Boolean function for Full Subtractor?

VIVA QUESTIONS
Q.1 What is Excess-3 code? Why it is called Excess-3 code?
Q.2 What is the application of Excess-3 Code?
Q.3 What is ASCII code?
Q.4 Excess-3 code is Weighted or Unweighted?
Q.5 Out of the possible 16 code combination? How many numbers used in Excess-3
       code?





VIVA QUESTIONS
Q.1. What is Demorgan’s Law?
Q.2. Show the truth table for Demorgan’s Theorem?
Q.3.What is Minterm & Maxterm?
Q.4. How Minterm can be converted in Max term?
Q.5. What is Hybrid function?

VIVA QUESTIONS
Q.1 What is Flip-Flop?
Q.2 What is Latch circuit?
Q.3 Draw a truth –tables of S-R, J-K, D and T?
Q.4 What is the disadvantages of S-R Flip-Flop?
Q.5 How can you remove the problem of S-R Flip –Flop?
Q.6 Make circuit diagram of S-R, J-K, D and T Flip-Flop?
Q.7 What do you understand by Race Aground condition? How it is over come
in J-K Flip Flop?

VIVA QUESTIONS
Q.1 Explain the principle of Multiplexer?
Q.2 Draw a circuit diagram of 4: 1 Multiplexer?
Q.3 What are the advantages of Multiplexer?
Q.4 What are the disadvantages of Multiplexer?
Q.5 Make the Truth-table of Multiplexer?

VIVA QUESTIONS
Q.1 Explain about Demultiplexer?
Q.2 Draw a circuit diagram of 1: 4 Demultiplexer?
Q.3 Make a logic diagram of 1: 4 Demultiplexer?
Q.4 What is the application of Demultiplexer?
Q.5 What is the difference between Multiplexer and Demultiplexer?


VIVA QUESTIONS
Q.1 Give some application of 555 timers IC?
Q.2 What are the basic elements of a 555 timer IC?
Q.3 Give important features of 555 timer IC?
Q.4 What do you mean by the term duty cycle of an astable multivibrator?
Q.5 For monostable operation of 555 timer IC, what mature of input trigger pulse
is needed?

Thursday, March 10, 2011

different type of projects !!

PROJECTS LIST 

S No.
Circuit Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100