Basic Electrical & Electronics Interview Questions & Answers

Basic Electrical & Electronics Interview Questions & Answers

1. Why we can’t store AC in Batteries instead of DC?
2. Three Phase Induction Motors (MCQs with Explanatory Answers)
3. The Main Difference between Active and passive Components (Very Easy Explanation with Examples)
4. Batteries. (MCQs with Explanatory Answers)
5. How to find The value of Burnt Resistor ( By three handy Methods )
6. Capacitors (MCQs with Explanatory Answers)
7. How to Calculate/Find the value of Ceramic / Non-Polarized Capacitors?
8. A Voltmeter, an ammeter (Ampere meter) and a battery cell are connected in series. It is observed that ammeter practically shows No Deflection. Why?
9. Why Power is Zero (0), in Pure Inductive, Pure Capacitive or a circuit in which Current and Voltage are 90 Degree out of phase?
10. Basic Concepts (MCQs With Explanatory Answers)
11. DC Circuits (MCQs with Explanatory Answers.)
12. Alternator / Generator ( MCQs with Explanatory Answers)
13. Transformer (MCQs With Explanatory Answers)
14. A (50/60 Hz) Transformer. Which one will give more Output? (When operates on 50 or 60 Hz frequency)
15. Why the circuit Current (I) decrease, when Inductance (L) or inductive reactance (XL) increases in inductive circuit?
16. Why the Circuit Power factor (Cos θ) Decreases, when Inductance (L) or inductive reactance (XL) increases, In inductive circuit?
17. Single Phase AC Circuits. MCQs ( With Explanatory Answers)
18. In inductive circuit, Why Current increases, when frequency Decreases?
19. Three Phase AC Circuits (MCQs With Explanatory Answers)
20. What is Main Difference b/w Electrical and Electronics Engineering? ( Very Simple)
21. Easy Charging Time and Charging Current Formula for Batteries. ( with Example of 120Ah Battery).
22. How To remember the direction of PNP and NPN Transistor. One of the Easiest way.
23. What is the Rule of Capacitor in AC and DC Circuit?
24. Batteries  Configuration. These Batteries have Connected in series or parallel? Clear Your Concept.
25. A Bulb is Connected in this strange way with Ammeter as shown in fig. then what will be the current in Amp-Meter? (Clear Your Concept)
26. Clear Your Concept. What will be the Current In ampere-meter which connected in Short path in This Basic Circuit.?
27. Clear Your Concept. What will be the Current In ampere-meter in This Basic Circuit.?
28. Ampere meter is connected in series with load. if there is also a short path, then what will be the current in Amp-Meter? (As shown Below)
29. What is the normal or average life expectancy of a Transformer ?
30. Why Flux in Primary and Secondary Winding of the Transformer is Same? With a Simple Explanation and Example.
31. According to Ohm's Law, Current increases, when Voltage increases,(I=V/R), But Current decreases, when Voltage increases according to (P=VI). Explain?
32. Ohm’s Law with simple explanation
33. What is the difference between a battery and a capacitor?
34. Why A.C needs more insulation than D.C at same voltage level?
35. What is The Difference between a VOLTAMETER and a VOLTMETER?
36. What is the objection to have lamps in a house-lighting circuit connected in series?
37. How To Find/Calculate the Number of Fluorescent Lamps in a Sub Circuit?
38. How to Determine the Number of Lamps in Final Sub Circuit?
39. How much Watts Solar Panel We need for our Home Electrical appliances?
40. Will a D.C Shunt Motor operate on an A.C Supply?
41. Why the reactance of a system under fault condition is low and faults currents may raise dangerously high value. ? (With simple example)
42. Explain the statement that induction motor is fundamentally a Transformer?
43. What is the difference between Power Transformers and Distribution Transformers?
44. What is the purpose of ground wires in over-Head Transmission lines?
45. What is the difference between real ground and virtual ground?
46. How To Calculate Your Electricity Bill. Easy and simple Explanation.
47. Under what condition is D.C supply applied safely to the primary of a transformer?
48. A step up transformer which has 110/220 turns. Can we replace it with 10/20 turns? Turns ratio is same shall its rating be same? Give appropriate reason?
49. What are the fundamental differences between E.M.F (Electro motive force) and P.d (Potential difference)?
50. Why alternator rated in kVA. Not in kW?
51. Can we operate a 60HZ Transformer on 50Hz Supply Source and Vice Versa?
52. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 5 Hz (frequency) source of the same voltage?
53. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage?
54. What will happen if the primary of a transformer is connected to D.C supply?
55. Why Transformer Rating In kVA, Not in KW 
56. Series, Parallel and Series-Parallel Configuration of Batteries
57. Main Difference between contactor and Starter.
58. Why We Need to Install a Starter with a Motor?
59. Why XL (Inductive Reactance) In DC Supply Is Zero (0)? 
60. What is the Working and Construction of Electric Phase or Line Tester
61. Advantages of Power factor improvement and Correction
62. What is motor starter? 
63. How to Connect a Portable Generator to Home Supply System (Three Methods)
64. Power Factor improvement Methods with Their advantages & Disadvantages
65. How to calculate the value of resistor for LED’s (with different types of LED’s circuits)
66. How to calculate or Find the value of SMD Resistors
67. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)?
68. How to Check a Capacitor with Digital (Multi meter) and Analog (AVO Meter). By Four (4) Methods with pictorial View.
69. What is the Q Factor in Electrical and Electronics Engineering 
70. What is Diversity Factor in Electrical Wiring Installation 
71. How to determine the suitable size of cable for Electrical Wiring Installation with Solved Examples (in both British and Si System)
72. How to Get Connection from Solar Panel. Back Side of The Solar Panel Junction Box and The Function of Diodes in it. 
73. How to Calculate the Suitable Capacitor Size in Farads & kVAR for Power factor Improvement (Easiest way ever) 
74. How to Convert Capacitor Farads into kVAR and Vice Versa (For Power factor improvement)
75. What is The Main Difference between Linear and Nonlinear Circuit   
76. How to determine the number of Nodes, Branches, Loops and Meshes in a Circuit? 
77. What is the Difference between Unilateral and Bi-Lateral Circuits & Elements 
78. Electric circuits / Networks and important terms related to it you must know
79. Thevenin's Theorem. Easy Step by Step Procedure with Example (Pictorial Views)
80. Norton’s Theorem. Easy Step by Step Procedure with Example (Pictorial Views)