33 Interview Questions in Electrical Engineering

Electrical Engineer Interview Questions
  • What Initially Sparked Your Interest in Electrical Engineering?
  • What Are the Main Types of Electric Current?
  • Can You Define Inductance and Capacitance?
  • What Kinds of Cables Are Used for Power Transmissions?
  • How Do Maintain Precision Throughout Your Work?

ELECTRICAL ENGINEER Interview Questions & Answers! (Electrician Interview Tips and Answers!)

What is an alternator, and what is a generator?

This is another technical question common for hiring managers to ask prospective electrical engineers. Interviewers like this question because a strong candidate answer will explain not just what an alternator and a generator are but also provide insight into when the engineer might use one over the other. In your answer, provide an example of when you might use an alternator or a generator on a project related to the type of work the company does to show youve done your research on the organization:

Example: “Alternators and generators are both technically generators, but they function in different ways and are usually used for different types of projects. Alternators create and store energy, only using whats necessary, while generators convert one source of power into another and dont store any excess energy. Alternators are best for small-scale projects, while generators are best for large-scale projects. I anticipate this company works primarily with generators since your clients are usually seeking large-scale solutions to their engineering problems.”

interview questions for electrical engineer

Laser diodes are compact transistor like packages with two or more electrical leads. Lasing occurs when stimulated emission results into the amplification of photon confined to the lasing mode. These photons hit back and forth between the back and front mirror, and hence a diverging beam emits from the laser diode packages.

Reverse polarity is referred in a condition where one or more of your receptacles are connected incorrectly. To fix the reverse polarity, check the wire connection at the outlet and inspect your receptacle. A receptacle with reverse polarity will have the white wire screwed to the hot side and the black wire will be connected to the neutral side, if that the case swap the wires and it will resolves the problem. If it persists, a licensed electrician will be needed.

Wire is sized by American Wire Gauge system. Your installation of conductors will depend on a few factors like gauge of the wire, wire capacity, etc. For wires, smaller the wire gauge larger the ampacity or capacity of the wire to handle current. For example, low voltage lighting and lamp cords will have 18 gauge, electric furnaces or large electric heaters are of 6 gauge.

interview questions for electrical engineer

A circuit breaker breaks the circuit by opening the contact terminals. During the opening, an arc is generated between the terminals that can be quenched using various mediums. In VCB, the medium for arc quenching is a vacuum. The vacuum has a high voltage arc quenching ability as compared to air & they are used for in high voltage circuits.

A Circuit Breaker is a protective electromechanical device used to control the flow of current same like a fuse. It automatically breaks the circuit in case of fault conditions like short circuit and overload. It can also manually break the circuit. It is ON-load & OFF load device, it means it operates in both ON/OFF supply condition.

VCB stands for Vacuum circuit breaker & ACB stands for Air Circuit Breaker. The VCB uses the vacuum as its arc quenching medium While ACB uses air as its arc quenching medium. The vacuum has very fast arc quenching & recovering properties as compared to ACB thus they are used is HT while ACB is used in LT.

When manufacturers design a transformer, they have no idea which kind of load will be connected to the transformer. The load may be resistive (R), inductive (L), capacitive (C) or mixed load (R, L, and C). Its mean, there would be different power factor (p.f) at the secondary (load) side. The output of real power may vary depending on the power factor. Thus the manufacturer denotes it as “this transformer can provide x number of amperes at y amount of voltage”. This way, they go for VA as in (voltage x Amperes) instead of W in case of rating of a Transformer.

A generator & an alternator both convert the mechanical energy into electrical energy. The key difference between them is that the generator has a stationary magnetic field i.e. the armature rotates inside a fixed magnetic field. while in an alternator, the magnetic field rotates inside a conductor windings (stator). So the stationary part of the alternator is phase conductors.

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