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Top 100+ Electrical And Electronics Engineering Interview Questions And Answers - May 29, 2020

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Top 100+ Electrical And Electronics Engineering Interview Questions And Answers

Question 1. What Does Bode Plots Shows?

Answer :

Bode plots are a graphical way to show the behavior of a circuit over a extensive range of frequencies. By plotting the amplitude and section versus the logarithm of frequency, every unit of alternate at the ω axis is same to a aspect of 10 also called a decade of frequency. Also, there may be a extensive distribution in the amplitude reaction over a specified range of frequencies. The common way is to plan the amplitude in dB and phase in ranges or radians as opposed to the logarithm of frequency.

Question 2. How To Calculate Energy Stored In An Inductance?

Answer :

Energy saved =half of L I2 Joules where L is in henries and I is in amps.

Electronics and Communications Engineering Interview Questions
Question three. How To Calculate Energy Stored In A Capacitance?

Answer :

half of C V2 Joules where C is in farads and V in volts.

Question four. At What Base You Will Tell The Direction Of Rotation Of Dc Motors And Generators?

Answer :

Motors obey the left hand rule and turbines the proper hand rule.

Question 5. What Is Force On Parallel Conductors?

Answer :

F = [2 I2 / d] 10­

Newtons/meter in which I is in amps and d is in meters With currents in opposite instructions, the force is pushing the conductors aside.

Programmable Logic Controller (PLC) Interview Questions
Question 6. What Is Corkscrew Rule?

Answer :

As cutting-edge flows along a twine,the magnetic area rotates inside the route of a corkscrew.

Question 7. How Would You Calculate Power Loss In A Resistor?

Answer :

W = I2 R = V2 / R.

Electrical Engineering Interview Questions
Question 8. What Do You Mean By Pull Of Electromagnet?

Answer :

Pu11= B2 107 / (eight ) Newtons according to m2 of magnet force wherein B is in tesla.

Question 9. What Is The Method To Solve Circuit Using Source Transformation?

Answer :

In an electric circuit, it is regularly convenient to have a voltage supply rather than a modern-day source (e.G. In mesh analysis) or vice versa. This is made feasible the use of supply modifications. It ought to be mentioned that most effective practical voltage and current resources may be transformed.

In different phrases, a Th´evenin’s equal circuit is transformed right into a Norton’s one or vice versa. The parameters used within the transformation are given as follows.

Th´evenin parameters: VTH ,RTH =⇒ RN = RTH ,IN = VTH/RTH.

Norton parameters: IN ,RN =⇒ RTH = RN ,VTH = RN IN.

Any load resistance, RL can have the same voltage across, and modern-day thru it when related throughout the terminals of either supply.

BHEL Interview Questions
Question 10. What Is Meant By Reverse Polarity And How It Can Be Fixed?

Answer :

Reverse polarity is referred in a situation in which one or extra of your receptacles are related incorrectly. To repair the reverse polarity, check the cord connection at the outlet and inspect your receptacle. A receptacle with opposite polarity will have the white wire screwed to the recent side and the black cord may be connected to the neutral aspect, if that the case change the wires and it'll resolves the trouble. If it persists, an authorized electrician can be wished.

Question eleven. Explain What Does A String Of Resistors In A Series Will Do?

Answer :

When a string of resistors in a sequence will divide the supply voltage into percentage to their values.

ELECTRONICS & INSTRUMENTATION Engineering Interview Questions
Question 12. What Happens If The Series Current Double?

Answer :

If the series contemporary receives double then, the resistance is halved.

Electronics and Communications Engineering Interview Questions
Question 13. What Will Be The Current If The Resistance Total In A Series Circuit Doubles?

Answer :

If the resistance general in a series circuit doubles the modern will reduce to 1/2.

Question 14. Explain What Is Laser Diodes?

Answer :

Laser diodes are compact transistor like programs with  or extra electrical leads. Lasing takes place whilst stimulated emission consequences into the amplification of photon restricted to the lasing mode.  These photons hit to and fro among the back and front mirror, and subsequently a diverging beam emits from the laser diode applications.

Question 15. What Is Meant By Cycle In Ac Waveform? What Is Period? Define Frequency?

Answer :

One whole set of trade in price is referred to as waveform. If you any fundamental query on AC waveform, then first draw an ac waveform and explain with regards to the waveform.

Control Systems-Electrical Engineering Interview Questions
Question sixteen. What Is Form Factor And Peak Factor?

Answer :

The ratio of rms fee to common cost of an ac quantity is referred to as form element.

Form Factor = RMS fee/ Average cost

The ratio of most fee to the RMS price of an ac amount is called as peak thing.

Peak Factor = Maximum Value/RMS cost

Question 17. What Are The Basic Components Required For Generator Action To Exits?

Answer :

A generating motion calls for following simple components to exits

The conductor or a coil.
The flux.
The relative movement among conductor and flux.
Electrical Machines Interview Questions
Question 18. Why Pole Shoe Has Been Given A Specific Shape?

Answer :

It is essential that maximum location of the armature comes across the flux produced via the field winding. 

Pole shoe enlarges the region of armature middle to come across the flux, that is essential to supply large prompted emf. To attain this, pole shoe has been given a particular form.

Programmable Logic Controller (PLC) Interview Questions
Question 19. Why Generators Are Operated In Parallel?

Answer :

The generators are operated in parallel to get, Continuity and reliability of provider with out interruption Maintenance and restore can be easy Efficient operation of each generator Increase in plant capacity

Question 20. What Are The Functions Of Yoke? What Is The Choice Material For The Yoke?

Answer :

It serves the motive of outer maximum cowl of the dc device. In order that the insulating fabric get covered from the damaging atmospheric environmental like noise, dirt and numerous gases like SO2, acidic fumes and so forth.
It presents mechanical assist to the poles.
It forms a part of the magnetic circuit.
It presents a route of low reluctance for magnetic flux.
It is prepared by the usage of forged iron. For massive machines, rolled metallic, forged steel, silicon metallic is used which affords high permeability.
DC motor Interview Questions
Question 21. How To Reverse The Direction Of Rotation Of Dc Motor?

Answer :

To opposite path of rotation of dc motor, either direction of fundamental field produced by means of the sphere winding is reversed or course of the contemporary passing via the armature is reversed.

By changing the route of modern-day passing through the sector winding,the course of the principle discipline can be reversed.

Question 22. How To Determine The Number Of Lamps In Final Sub Circuit?

Answer :

If it's far decided the modern score and already cable established in keeping with the rating of very last sub circuit. And we want to realize that what number of mild factor will be in this final sub circuit. 

Suppose for a ordinary lights in a home,office or corridor, the modern rating of sub circuit or very last sub circuit is 5Amp and supply Voltage is 220 Volts. Then what number of a hundred  Watt Lamps we are able to instal on that precise sub circuit. We can locate the quantity of lamps  by using the use of this formula.

Question 23. What Are The Main Difference Between Active And Passive Components?

Answer :

The Main Difference among Active and Passive Components

Active Components: Those gadgets or components which produce strength in the shape of Voltage or Current are referred to as as Active Components
For Example: Diodes Transistors SCR and many others… 

Passive Components: Those devices or additives which keep or keep Energy within the shape of Voltage or Current are called Passive Components 
For Example:  Resistor, Capacitor, Inductor and so on…  

Induction Motors Interview Questions
Question 24. What Is Capacitance?

Answer :

Capacitance (C): Capacitance is the quantity of electrical fee moved inside the condenser (Capacitor), while one volt electricity supply is attached across its terminal.

Electrical Engineering Interview Questions
Question 25. What Is Capacitance Equation?

Answer :

Capacitance Equation:

C=Q/V

Where,

C=Capacitance in Farads (F).
Q=Electrical Charge in Coulombs.
V=Voltage in Volts.
Question 26. How Capacitor Works?

Answer :

Working and Construction of a capacitor :

Whenever voltage is implemented across its terminals, (Also called charging of a capacitor) present day start to glide and preserve to journey till the voltage throughout both the poor and wonderful (Anode and Cathode) plates grow to be same to the voltage of the source (Applied Voltage). These two plates are separated via a dielectric material (consisting of mice, paper, glass, etc. That are insulators), that's used to boom the capacitance of the capacitor.

When we connect a charged capacitor throughout a small load, it begins to supply the voltage (Stored power) to that load till the capacitor fully discharges.

Capacitor comes in different shapes and their fee is measured in farad (F). Capacitors are used in each AC and DC structures 

Electrical Power System Interview Questions
Question 27. What Is Capacitor?

Answer :

The capacitor is a  terminal electrical device used to save electric strength within the shape of electric discipline among the two plates. It is also known as a condenser and the SI unit of its capacitance degree is Farad “F”, where Farad is a huge unit of capacitance, so they're the usage of microfarads (µF) or nanofarads (nF) in recent times.

BHEL Interview Questions
Question 28. What Is The Role Of Capacitor In Ac And Dc Circuit?

Answer :

Role of Capacitor in AC Circuits: In an AC circuit, capacitor reverses its fees as the modern alternates and produces a lagging voltage (in different phrases, capacitor provides leading contemporary in AC circuits and networks).

Role and Performance of Capacitor in DC Circuit.

In a DC Circuit, the capacitor as soon as charged with the applied voltage acts as an open switch.

Question 29. Why We Can’t Store Ac In Batteries Instead Of Dc.Or Can We Store Ac In Batteries Instead Of Dc?

Answer :

We can not store AC in batteries due to the fact AC changes their polarity up to 50 (When frequency = 50 Hz) or 60 (When frequency = 60 Hz) instances in a 2d. Therefore the battery terminals keep changing Positive (+ve) becomes Negative (-Ve) and vice versa, but the battery cannot change their terminals with the same pace so that’s why we are able to’t store AC in Batteries.

 Further, while we connect a battery with AC Supply, then It will charge during fine 1/2 cycle and discharge all through terrible half cycle, due to the fact the Positive (+ve) half cycle cancel the bad (-Ve) 1/2 cycle, so the average voltage or modern in a complete cycle is Zero. So there may be no chance to save AC inside the Batteries.

Electrical Drives Interview Questions
Question 30. What Is An Instrumentation Amplifier?

Answer :

An instrumentation (or instrumentational) amplifier is a type of differential amplifier that has been outfitted with enter buffer amplifiers, which remove the need for input impedance matching and consequently make the amplifier mainly suitable to be used in size and take a look at system.

Question 31. Define Modulation. ?

Answer :

In electronics and telecommunications, modulation is the procedure of varying one or extra homes of a periodic waveform, referred to as the service sign, with a modulating sign that commonly consists of information to be transmitted.

Question 32. What Is Am?

Answer :

Amplitude modulation (AM) is a modulation method utilized in digital communique, maximum typically for transmitting information through a radio carrier wave. In amplitude modulation, the amplitude (sign strength) of the carrier wave is various in share to the waveform being transmitted. That waveform can also, for example, correspond to the sounds to be reproduced with the aid of a loudspeaker, or the mild intensity of tv pixels.This approach contrasts with frequency modulation, wherein the frequency of the provider signal is varied, and section modulation, wherein its phase is varied.

Question 33. What Is Fm?

Answer :

In telecommunications and signal processing, frequency modulation (FM) is the encoding of data in a carrier wave via various the immediately frequency of the wave. (Compare with amplitude modulation, wherein the amplitude of the carrier wave varies, even as the frequency remains steady.)

ELECTRONICS & INSTRUMENTATION Engineering Interview Questions
Question 34. What Is The Purpose Of Using Data Modem?

Answer :

Short for modulator­demodulator. A modem is a tool or program that allows a laptop to transmit facts over, as an example, phone or cable traces. Computer records is stored digitally, whereas statistics transmitted over smartphone strains is transmitted in the shape of analog waves.

Question 35. What Is Zigbee?

Answer :

ZigBee is a IEEE 802.15.4­based totally specification for a collection of excessive­degree communication protocols used to create personal vicinity networks with small, low­strength digital radios.

Question 36. What Is Pcb?

Answer :

A printed circuit board (PCB) automatically supports and electrically connects electronic components the usage of conductive tracks, pads and other capabilities etched from copper sheets laminated onto a non­conductive substrate.

Control Systems-Electrical Engineering Interview Questions
Question 37. Define Voltage Regulator?

Answer :

A voltage regulator is designed to robotically hold a regular voltage level. A voltage regulator may be a easy “feed­ahead” design or may additionally encompass negative feedback control loops. It may use an electromechanical mechanism, or digital components.

Question 38. What Is Scr?

Answer :

Thyristors or silicon managed rectifiers, SCR are locate many makes use of in electronics, and particularly for electricity manage. These gadgets have even been called the workhorse of high power electronics.Thyristors are capable of transfer huge levels of energy are consequently they utilized in a huge range of different programs. Thyristors even finds makes use of in low power electronics where they may be used in many circuits from mild dimmers to power supply over voltage safety.

Question 39. Define Microprocessor?

Answer :

A siliconchip that incorporates a CPU. In the world of private computer systems, the phrases microprocessor and CPU are used interchangeably. At the heart of all private computers and most workstations sits a microprocessor. Microprocessors additionally manage the logic of almost all digitaldevices, from clock radios to gas­injection structures for motors.

Question forty. Define Microcontroller?

Answer :

A microcontroller (on occasion abbreviated µC, uC or MCU) is a small laptop on a single included circuit containing a processor middle, memory, and programmable enter/output peripherals.

Electrical Machines Interview Questions
Question 41. Define Timer?

Answer :

The 555 timer IC is an included circuit (chip) utilized in a diffusion of timer, pulse era, and oscillator packages. The 555 may be used to provide time delays, as an oscillator, and as a turn­flop detail. Derivatives offer up to 4 timing circuits in one package deal.

Question forty two. Define Various Modes Of Operation Of Timer?

Answer :

The 555 has three predominant operating modes, Monostable, Astable, and Bistable. Each mode represents a one of a kind sort of circuit that has a  unique output. Astable mode, Bistable Mode (or Schmitt Trigger), Monostable mode.

DC motor Interview Questions
Question forty three. What Is Dsp?

Answer :

Digital signal processing (DSP) refers to various strategies for enhancing the accuracy and reliability of virtual communications. The idea behind DSP is quite complicated.Basically, DSP works by clarifying, or standardizing, the tiers or states of a digital sign.

Question forty four. Define Voltage Controller?

Answer :

A voltage controller, also referred to as an AC voltage controller or AC regulator is an electronic module primarily based on either thyristors, TRIACs, SCRs or IGBTs, which converts a set voltage, constant frequency alternating current (AC) electrical input deliver to obtain variable voltage in output introduced to a resistive load.

Question 45. Define Awgn?

Answer :

AWGN­Additive White Gaussian Noise. Its the herbal noise delivered within the machine.Correlator are used to take away the noise. Equalizer are used to get rid of the ISI, in the receiver.




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