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Basic Electrical & Electronics Interview Questions & Answers

Electrical & Electronics Interview Questions & Answers

Basic Electrical & Electronics Interview Questions & Answers (Electrical and Electronics Engineering Notes and Articles)

Basic Electrical & Electronics Engineering and Technology Interview Questions & Answers

  1. Why we can’t store AC in Batteries instead of DC?
  2. Why Motor rated in kW instead of kVA?
  3. Why Battery rated in Ah (Ampere hour) and not in VA.
  4. Three Phase Induction Motors (MCQs with Explanatory Answers)
  5. The Main Difference between Active and passive Components (Very Easy Explanation with Examples)
  6. Batteries. (MCQs with Explanatory Answers)
  7. How to find The value of Burnt Resistor ( By three handy Methods )
  8. Capacitors (MCQs with Explanatory Answers)
  9. How to Calculate/Find the value of Ceramic / Non-Polarized Capacitors?
  10. Why Power is Zero (0), in Pure Inductive, Pure Capacitive or a circuit in which Current and Voltage are 90 Degree out of phase?
  11. Basic Concepts (MCQs With Explanatory Answers)
  12. DC Circuits (MCQs with Explanatory Answers.)
  13. Alternator / Generator ( MCQs with Explanatory Answers)
  14. Transformer (MCQs With Explanatory Answers)
  15. A (50/60 Hz) Transformer. Which one will give more Output? (When operates on 50 or 60 Hz frequency)
  16. Why the circuit Current (I) decrease, when Inductance (L) or inductive reactance (XL) increases in inductive circuit?
  17. Why the Circuit Power factor (Cos θ) Decreases, when Inductance (L) or inductive reactance (XL) increases, In inductive circuit?
  18. Single Phase AC Circuits. MCQs ( With Explanatory Answers)
  19. In inductive circuit, Why Current increases, when frequency Decreases?
  20. Three Phase AC Circuits (MCQs With Explanatory Answers)
  21. What is Main Difference b/w Electrical and Electronics Engineering? ( Very Simple)
  22. Easy Charging Time and Charging Current Formula for Batteries. ( with Example of 120Ah Battery).
  23. How To remember the direction of PNP and NPN Transistor. One of the Easiest way.
  24. What is the Rule of Capacitor in AC and DC Circuit?
  25. Batteries  Configuration. These Batteries have Connected in series or parallel? Clear Your Concept.
  26. 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)
  27. Clear Your Concept. What will be the Current In ampere-meter which connected in Short path in This Basic Circuit.?
  28. Clear Your Concept. What will be the Current In ampere-meter in This Basic Circuit.?
  29. 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)
  30. What is the normal or average life expectancy of a Transformer ?
  31. Why Flux in Primary and Secondary Winding of the Transformer is Same? With a Simple Explanation and Example.
  32. According to Ohm’s Law, Current increases, when Voltage increases,(I=V/R), But Current decreases, when Voltage increases according to (P=VI). Explain?
  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. Main Difference between contactor and Starter.
  57. Why We Need to Install a Starter with a Motor?
  58. Why XL (Inductive Reactance) In DC Supply Is Zero (0)?
  59. What is motor starter?
  60. How to calculate the value of resistor for LED’s (with different types of LED’s circuits)
  61. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)?
  62. How to Check a Capacitor with Digital (Multi meter) and Analog (AVO Meter). By Four (4) Methods with pictorial View.
  63. What is the Q Factor in Electrical and Electronics Engineering
  64. How to Get Connection from Solar Panel. Back Side of The Solar Panel Junction Box and The Function of Diodes in it.
  65. Power Factor improvement Methods with Their advantages & Disadvantages
  66. Causes of Low power Factor
  67. Advantages of Power factor improvement and Correction:
  68. How to Calculate the Suitable Capacitor Size in Farads & kVAR for Power factor Improvement (Easiest way ever)
  69. How to Convert Capacitor Farads into kVAR and Vice Versa (For Power factor improvement)
  70. Why Power Plant Capacity Rated in MW and not in MVA?
  71. Working and Construction of Electric Phase or Line Tester
  72. How to find Diversity Factor in Electrical Wiring Installation
  73. Series, Parallel and Series-Parallel Configuration of Batteries
  74. How to Connect a Portable Generator to Home Supply System (Three Methods)
  75. Norton’s Theorem. Easy Step by Step Procedure with Example (Pictorial Views)
  76. Thevenin’s Theorem. Easy Step by Step Procedure with Example (Pictorial Views)
  77. Difference between Unilateral and Bi-Lateral Circuits & Elements
  78. How to determine the number of Nodes, Branches, Loops and Meshes in a Circuit? 
  79. What is The Main Difference between Linear and Nonlinear Circuit
  80. A Voltmeter, an ammeter (Ampere meter) and a battery cell are connected in series. It is observed that ammeter practically shows No Deflection. Why?
  81. How to calculate or Find the value of SMD Resistors
  82. How to determine the suitable size of cable for Electrical Wiring Installation with Solved Examples (in both British and Si System)
  83. What is the difference between AC and DC Resistance & How to calculate it?
  84. Electric circuits / Networks and important terms related to it you must know
  85. Why AC rated in Tons, Not in kW or kVA? A Guide about Airconditioner and Refrigeration
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30 comments

  1. why not solar energy is very much common in india inspite of 305 days are clear sun shine.<br />

  2. i want to participate in Electrical seminar<br />

  3. At 400Hz Transformer rating is 400KVA, what will be the KVA rating at 50Hz?

  4. please give a tutorial on transformer winding and designing i.e turn ratio,current rating etc

  5. If we took a cheap portable generator and remove the engine that drives it, attach it to bike pedals or turbine blades and run it on humanpower or steam, will it work just the same? Thank you.

  6. I need some help to see if there is a solution that will involve not using a generator. Are there any batteries that would be capable of operating a table top food warmer with a 400 watt heat element and 100 watt bulb? If there are, what would be the max duration the warmer could reasonably function. The idea is to make a portable food cart bicycle. Most hot dog vendor bicycle carts use propane but will make food soggy. I just need a warming device for items like pizza or bread sticks, food you don’t want steamed. A generator would be too loud for a small bicycle food cart. Are there any batteries or innovative ideas that could work?

    Thanks!

  7. mandeep kumar pradhan

    waleed khalafalla: need about high voltage..

  8. kadiri Monday

    What is the deference between voltage and current.tnks 4 ur respond

    • In simple word current is ur body and voltage is ur potential …..to push ur body potential is required

  9. NICE Q&A’S

    VERY USE FULL

  10. wt is derationg factor

  11. I want answer for all questions…

  12. Thanveer ahamed

    Its v.useful

  13. I want to all answers the flowing question

  14. as law in Dc Positive – Negative = Negative -A + Positive -E but i seen its diffrance why

  15. Pls explain the following and how these are workingwith PLC

    1.I/O module Card
    2.I/O Bus
    3.RS 485-FC
    4.Adaptor Card
    5.Ribbon Adaptor

  16. Hi,
    I bought a mobile phone from USA a Sprint samsung galaxy s2 d 710, a CDMA phone, it means they have not a sim slot (they have only an SD memory card slot.). I found in the market a device comprising the sim card slot and the SD memory card slot together.
    My question is: Can I remove the old device which has only SD memory card slot and replace it with the new one comprising the two slots and put it on the motherboard ? Can this new device work properly whithout problem ?
    Best Regards

  17. Mahi Mahendra

    I want download all this quastions.so please set the downloaded link

  18. Debaprasad Santra

    The phase voltage of a 3 phase source are V1(t)=100cos( t60o), V2(t)=100cos( t+60o), V3(t)= -100cos( t) this source is————–

    a) Balanced and positive sequence b) unbalanced and positive sequence
    c) Balanced and negative sequence d) unbalanced and negative sequence

  19. i want an alarm which rung only one time after the electricity comes than automatically turn off any body can help me about it

  20. Can I know the formula to calculate the genset capacity? For example, what are the genset capacity for 50amps PRIME power and 50amps STANDBY power ? Thank you.

  21. joseph mark Wasswa

    I need answers to all these questions

  22. i just need answer for all d question.

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