Electrical Interview Questions - with Answers

Sep 25, 2026

Uploaded by lilac

Set of electrical engineering interview questions with concise explanations covering foundational concepts and applied electrical systems. Content defines electrical engineering, electricity, static and current forms, and describes production methods for electricity with examples. It distinguishes DC and AC usage in real-world devices, explains active, reactive, apparent, and complex power, and covers leading/lagging power factor with correction methods. Additional circuit fundamentals address unilateral vs bilateral and linear vs non-linear behavior, including current relationships.

LanguageEnglish

CategoryExam

FormatPDF

Pages43

Reading Time1 h 48 min

AccessFree to download

Electrical Interview Questions

Fundamentals of electricity

DC and AC concepts

Power in electrical systems

Power factor and correction

Circuit types

Electrical Interview Questions 1) What is Electrical Engineering? 􀀁 Electrical Engineering is the field of Engineering that generally deals with the study and application of electricity, electronics, and electromagnetism. 2) What is electricity ? 􀀁 Electricity is a general term used for all phenomena caused by electric charge whether static or in motion. 3) What are the types of electricity ? 􀀁 There are two types,(1) Static Electricity and (2) Current Electricity. 4) What is static electricity ? 􀀁 Static electricity means electricity at rest in contradistinction to dynamic or current electricity the effects of which are purely due to the electrostatic field produced by the charge. As it is obtained by rubbing two substance such as glass and silk it is also called frictional electricity. 5) What is current electricity ? 􀀁 Current electricity means the electricity in motion the effects of which are due to the flow of electrons in a conductor. 6) What are the types of current electricity ? 􀀁 There are two types :- (1) Direct current and (2) Alternating current. 7) What are the different methods of producing electricity ? Give examples. 􀀁 The methods are – i) By means of frictions-Static electricity is produced. ii) By means of chemical action in cells and batteries. iii) By means of mechanical driving-Generator produces electricity in two dissimilar methods. iv) By means of heat – Thermal electricity is produced. v) By means of lighting effect – Electricity is produced in photo electric cell. 8) Explain the difference between direct and alternating current? 􀀁 Direct current (DC) is the flow of electric charge in only one direction. It is the steady state of a constant-voltage circuit. 􀀁 Alternating current (AC) is the flow of electric charge that periodically reverses direction. If the source varies periodically, particularly sinusoidal, the circuit is known as an alternating current circuit. 9) Where is D.C. used ? 􀀁 (1)Battery charging,(2)Electroplating,(3)Electrolysis,(4) Relays,(5) Traction motors,(6) Cinema projector. 10) Where is A.C. used ? 􀀁 (1)House hold appliances,(2) Fan,(3) Refrigerators,(4)Power driving motors. (5)Radio and T. V. Set etc. 11) What is active, reactive, apparent & complex power? 􀀁 I) Active power: It is the actual power that is delivered to the load such as transformer, induction motors, generators, etc and dissipated in the circuit. It is denoted by P & its unit is watts W. 􀀁 II) Reactive Power: The powers that continuously bounce back and forth between source and load is known as reactive power. It is denoted by Q & its unit is VAR voltage-ampere reactive. 􀀁 III) Apparent Power: It is the product of voltage & current without referencing the phase difference between them. It is a combination of active power & reactive power. It is denoted by S & its unit Volt-Ampere, VA. 􀀁 III) Complex power: it is the product of voltage & current with reference to the phase difference between them. it is the complex sum or vector sum of the active power & reactive power. It is denoted by S & measure in VAR. 12) What is a leading & lagging power factor & how can you improve it? State the methods of power factor correction? 􀀁 The cosine of the angle between voltage & current is called the power factor. If the current leads the voltage, it causes a leading power factor. If the current lags voltage the power factor is lagging. Most loads are inductive that causes a lagging power factor. Thus these following methods are used for p.f correction (to nullify the lagging current):- i) Static Capacitor 􀀁 The capacitor helps in providing a leading current that eliminates the lagging component of current & improves the power factor ii) Synchronous Condenser 􀀁 It is an over-excited synchronous motor with no load that also provides a leading power factor. iii) Phase Advancer 􀀁 Phase advancer is a simple AC exciter which is connected on the mai

FAQs

What is the difference between static electricity and current electricity?

Static electricity is electricity at rest, produced by electrostatic effects such as rubbing. Current electricity is electricity in motion, caused by electron flow in a conductor.

Where are DC and AC commonly used?

DC is used in battery charging, electroplating, electrolysis, relays, traction motors, and cinema projectors. AC is used in household appliances, fans, refrigerators, power driving motors, radios, and TV sets.

What are active, reactive, apparent, and complex power?

Active power is delivered to the load and dissipated (P, watts). Reactive power alternates between source and load (Q, VAR). Apparent power combines active and reactive (S, VA). Complex power accounts for phase difference between voltage and current (vector sum of active and reactive, measured with VAR in the provided text).

Sep 25, 2026

Uploaded by lilac

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