# 90 TOP ELECTRICAL CIRCUITS VIVA Questions and Answers

## 90 TOP ELECTRICAL CIRCUITS VIVA Questions and Answers

Electrical Circuits VIVA Questions and Answers

1.What is Current?

3.Could you measure current in parallel?

4.What is the difference between Voltages or Potential Difference? And what are they?

5.Could you measure Voltage in series?

6.How many Types of Circuit Loads are there in a Common Electrical Circuit?

7.What are the different Sign Conventions used in electric circuits?

8.What do you mean by Passive Circuit Elements and why these are called Passive?

9.State and define Ohm’s Law?

10.Please Define Ohm’s Law for A.C (Alternating Current)?

11.What is the function of Capacitor in Electrical Circuits?

12.Why Inductors are installed in electrical Circuits?

13.Briefly explain the purpose of Inductor in an electric circuit?

14.What do you mean by dependent and independent voltage sources?

15.Differentiate between ideal and non-ideal voltage sources?

16.What does the term “Voltage Regulation” means?

17.What is DC Current source? Differentiate between ideal and non ideal current sources?

18.What id difference between power and energy?

19.What is Voltage Divider Rule?

20.What is Kirchoff ’s Current Law (KCL)?

21.What is Current Divider Rule (CDR)?

22.What is Superposition Theorem?

23.Please elaborate Th´evenin’s Theorem?

24.State and define Norton’s Theorem?

25.What is the method to solve circuit using Source Transformation?

Electrical Circuits VIVA Questions and Answers

26.What is Maximum Power Transfer Theorem?

27.Define Super node?

28.What does the term Supermesh means?

29.What do you mean by Phasors?

30.What does the term Power Factor shows?

31.Differentiate between Real and Apparent Power?

32.What does Bode Plots shows?

33.Differentiate between Low Pass, High pass and Band Pass filter?

34.What is Corkscrew Rule?

35.What does Ampere turns shows?

36.Differentiate between Magnetic field and Magnetic Flux?

37.What is Force on a conductor in a magnetic field ?

38.What is force on parallel conductors ?

39.What do you mean by Pull of Electromagnet?

40.How would you calculate Power loss in a resistor?

41.At what factor Resistance R of a conductor depends?

42.Differentiate between Kirchhoff’s First law and Kirchhoff’s Second law?

43.Differentiate between Induced emf and Self inductance?

44.How to calculate Energy stored in an inductance?

45.How to calculate Energy stored in a capacitance

46.At what base you will tell the direction of rotation of DC Motors and Generators?

47. Explain bypass capacitor?

48. What is meant by coupling capacitor?

49. Why does amplifier gain reduce?

50. Explain the different regions in frequency response?

51. State the types of distortions in amplifier?

52. What is cross over distortion? How it can be eliminated?

53. Define noise?

54. Define step response?

55. Draw the symbol of JFET and MOSFET.

56. What are the two modes of MOSFET?

57. Define pinch-off voltage

58. What is feed back and what are feed back amplifiers?

59. What is meant by positive and negative feedback?

60. What are the advantages and disadvantages of negative feed back?

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 an op- amp Schmitt trigger?

65. Give the expression for the frequency of oscillations in an op-amp sine wave

66. oscillator?

67. What are the conditions for sustained oscillator or what is Backhouse criterion?

68. What is Oscillator circuit?

69. What are the classifications of Oscillators?

70. What are the types of feedback oscillators?

71. Define Piezo-electric effect?

72. Draw the equivalent circuit of crystal oscillator?

73. What is Miller crystal oscillator? Explain its operation?

74. State the frequency for RC phase shift oscillator?

75. Give the topology of current amplifier with current shunt feedback?

76. What are gain margin and phase margin?

77. What is the minimum value of hfe for the oscillations in transistorized RC

78. Phase shift oscillator?

79. What is LC oscillator?

80. Draw the circuit of clapp oscillator?

81. How does an oscillator differ from an amplifier?

82. Name two low frequency oscillators?

83. What is class AB operation?

84. Define conversion efficiency of a power amplifier. What is its value for class C

85. power amplifier?

86. What is crossover distortion? How it can be eliminated?

87. What is meant by Harmonic distortion?

88. What is the drawback of class B amplifier? How is this minimized?

89. Define thermal resistance in the context of power amplifier.

90. What are the types of class B amplifier?