Top Electrical Engineering Interview Questions & Answers

1.What do you comprehend by the word electrical engineering? 

Electrical Engineering is the field of Engineering that normally manages the learning and utilization of gadgets, power, and electromagnetism. It includes studies on high voltage, especially AC over the series of 110 or 220V. Also, electrical machines and gadgets utilize irregular flow (AC)/Voltages and are slanted to be better in size and require 230V (In UK) and 110V (In US) single-stage ac voltages while in ventures and control stations, it could be up to 11kV and for broadcast, it very well might be better than 400kV. 

2. What alludes to the electron in the outer orbit? 

Electrons in the outer orbit are distinguished as valence. 

3. What do you mean by electric traction? 

Electric traction implies the electric force for the grip system. Electric traction implies the use of the power for rail routes, cable cars, streetcars, and so forth. These days, electric traction is additionally utilized for short trains. What’s more, basically dc engines are utilized for electric foothold frameworks. 

4. Characterize the Ideal Transformer

An ideal transformer is a transformer where no misfortunes occur by any stretch of the imagination. In another dialect, the transformer input power is identical to the output power of the transformer, for example, they have 100% capability. It is only a speculative transformer because there should be a few misfortunes in an ideal transformer. 

Transformer input Power = Transformer Output Power. 

PIN = POUT. 

5. Explain the connection of the tube light circuit, and how can it work? 

A choke is connected in one finish of the tube light, and a starter is in grouping with the circuit. At the point when supply is given, the starter will sever the supply of AC. Because of the surprising modification of supply, the choke will make around 1000volts. This volt will be able to break the electrons inside the tube to make an electron stream. When the available pass through the line the starter circuit will be out of the part. Presently there is no change of supply causing choke voltage standardized and go about as reduce the current. 

6. State merits of speed control utilizing thyristor

Some of them are: 

• Ease of use
• High precision
• Quick switching attributes than BJT, IGBT 

7. Explain the principle of motor? 

At whatever point a new conveying entertainer is set in a convincing field, it produces turning or curving development known as force. 

8. Characterize Armature Reaction

The consequence of armature flux to major flux is called armature response. The armature motion may hold up fundamental motion or goes against major flux 

9. Explain the Acsr cable and where we use it

ACSR implies Aluminum conductor steel non-fragile this entertainer is utilized in broadcast and appropriation. 

10. What do you understand about 2 phase motors?

A two-stage motor is a coast with the beginning winding, and the activity winding has a phase part for example an AC servo engine. Where the auxiliary winding and the supplementary winding have a phase part of 90 degrees. 

11. What is RLC Circuit? 

An RLC circuit completes an electrical circuit consisting of a resistor (R) and the inductor (L) and a capacitor (C), connected in parallel. This circuit is referred to as a second-request circuit as any electrical energy or flow in the circuit can be depicted by a next request inconsistency condition. 

12. Tell the composition of transistors? 

Transistors contain various blends of n-type and p-type semiconductors. 

13. In the event of a series current double, what happens? 

Assuming the series current gets twofold, the confrontation is divided. 

14. What is a Zener diode? 

Zener diode is a sort of semiconductor diode that grants existing to stream the clashing way when uncovered to adequate voltage. 

15. What does a series of resistors in a series arrangement do? 

At the point when a series of resistors in an arrangement will part the source voltage into the add up to their qualities. 

16. What is the job of the semiconductor in the Circuit? 

Semiconductor inclines to heighten the current, because of the explanation that yield authority can be higher ranking than the information power. 

17. What are the sorts of semiconductors? 

There are two sorts of semiconductors intrinsic and extrinsic. In extrinsic semiconductors, you will contain N-type semiconductors and P-type semiconductors. 

18. What happens when two positively charged materials are set together? 

At the point when two positively electric materials place mutually, it will repulse. 

19. What is an automatic voltage controller? 

AVR is compression for the Automatic Voltage Regulator. It is a focal piece of Synchronous Generators; it controls the creation voltage of the originator by controlling its excitation current. Along these lines, it can coordinate the Reactive efficiency Power of the Generator. 

20. Characterize Sf6 circuit breaker 

SF6 is Sulfur hexaFluoride gas. If this gas is utilized as bend extinguishing normal in a Circuit breaker implies SF6 CB. 

21. What do you mean by frantic effect? 

The yield voltage is superior to the exertion voltage or getting end voltage is better than the sending end voltage. 

22. What is implied by insulation voltage in links? 

It is the assets of a wire by its great nature that can withstand the practical voltage without bursting it is known as the protection level of the wire. 

23. Express the contrast between a four-point starter and a three-point starter 

The shunt relationship in the four-point starter is given unconnected from the line though in the three-point starter it is related with a bar which is the negative perspective in the three-point starter. 

24. Explain unilateral and bilateral circuits.

A unilateral is a sort of circuit whose properties modify with the course of the present stream or the voltage. The properties of a bilateral circuit don’t adjust with altering the current course or acquire voltage. 

25. Explain the maximum power transfer theorem. 

It specifies the state for the greatest force move from source to stack. It expresses that in a straight, bilateral e organization, the most extreme force will be moved from premise to load when the external burden opposition rises to the inside obstruction of the wellspring of the circuit. 

26. Explain Reverse Polarity and how to fix it.  

Reverse polarity is alluded to in a condition where at least one of your receptacles is associated erroneously. To fix the reverse polarity, check the wire association at the power source and review your container. A container with polar reversal will have the white wire screwed to the hot side and the dark wire will be associated with the nonpartisan side, if that is the case trade the wires and it will settle the issue. If it endures, an authorized electrical technician will be required. 

27. Explain what rectifiers are and what are the sorts of rectifiers? 

A rectifier is an electrical gadget that changes A.C or exchanging flow into the direct flow (D.C), which streams just a single way. The kinds of rectifiers are 

Half wave rectifier: It utilizes one p-n intersection 

Full-wave rectifier: It utilizes two p-n intersection 

28. Explain what a Zener diode is? 

Zener diode is a sort of semiconductor diode that permits current to stream the other way when presented to sufficient voltage. 

29. Why Transformer Rated In kVA, Not in KW? 

At the point when producers plan a transformer, they have no clue about which sort of burden will be associated with the transformer. The heap might be resistive (R), inductive (L), capacitive (C), or blended burden (R, L, and C). It means there would be a diverse force factor (p.f) at the optional (load) side. The yield of genuine force may differ contingent upon the force factor. Consequently, the producer means it as “this transformer can give x number of amperes at y measure of voltage”. Thus, they go for VA as in (voltage and Amperes) rather than W if there should be an occurrence of the rating of a Transformer. 

30. What is an Ideal Transformer? 

An ideal transformer is a nonexistent transformer where no misfortunes happen by any means. As such, the transformer Input power is equivalent to the yield force of the transformer for example they have 100% productivity. It is only a hypothetical transformer because there should be a few misfortunes in a genuine transformer. 

31. What is the voltage guideline of the transformer and for what reason is it significant? 

The voltage guideline of a transformer is the rate change in the auxiliary voltage from no heap to full load condition. Preferably, the optional voltage stays as before all through the heap, where case the voltage guideline is zero. Yet, essentially it differs with the force factor of the heap. 

The voltage guideline esteem gives the proficiency of the transformer and it is ideal to lean toward a transformer with low voltage guideline. 

32. Why should the current transformer’s auxiliary ought not be open when there is a current stream in its essence? 

The current transformer is a stage-up transformer that expands the voltage and diminishes the current on the auxiliary side. Under the open optional condition, the essential current turns into the polarizing current that produces a high auxiliary voltage that can harm the protection also as can present a risk to the workforce. 

33. How can you say whether a circuit is inductive or capacitive or resistive? 

The complete impedance of the circuit can be utilized to recognize the circuit. If the nonexistent piece of the absolute impedance is positive, it is an inductive circuit. The nonexistent part is negative, and afterward, it is a capacitive circuit. On the off chance that it is zero, the circuit is resistive.

34. What is a linear and non-linear circuit? 

In a linear circuit, the connection between the current and voltage is straight for example straightforwardly corresponding. The circuit boundary like recurrence, obstruction, inductance, capacitance, and so forth stays consistent with shifting current and voltage. 

While in the non-linear circuit, the current and voltage doesn’t have a direct relationship. The electrical boundaries of such circuits change with shifting voltage and flow. 

35. What are the constraints of ohm’s law? 

Ohm law isn’t pertinent to a one-sided circuit or a non-direct circuit. The rule for ohm’s law is that the opposition should be steady which additionally relies upon the temperature. While the opposition of a non-director unilateral circuit shifts with voltage and current. Consequently, it isn’t relevant in such a circuit. Likewise, the temperature should stay steady. 

36. Explain active, reactive, apparent, and complex force? 

Active force: it is the genuine force that is conveyed to the heap like a transformer, acceptance engines, generators, and so forth and disseminated in the circuit. It is meant by P and its unit is watts W. 

Reactive Power: The forces that consistently skip to and fro among source and burden is known as responsive force. It is indicated by Q and its unit is VAR voltage-ampere responsive. 

Apparent Power: It is the result of voltage and current without referring to the stage distinction between them. It is a blend of dynamic force and receptive force. It is signified by S and its unit Volt-Ampere, VA. 
Complex force: it is the result of voltage and current regarding the stage distinction between them. it is the mind-boggling total or vector amount of the dynamic force and receptive force. It is indicated by S and measured in VAR.