Basic electrical and electronics engineering viva questions Computer Science 1st Sem

 

Basic electrical and electronics engineering viva questions

Subjects Name (1st Sem Computer Science & Engineering)

• Engineering Chemistry
• Mathematics-I
• English
• Basic Electrical & Electronics Engineering
• Engineering Graphics

Question 1. What Does Bode Plots Shows? 

Answer - Bode plots are a graphical way to display the deportment of a circuit over a wide range of prevalence. By machinating the scope and phase versus the logarithm of prevalence, each unit of change on the ω axis is equal to a factor of 10 also called a decade of prevalence. Also, there may be a wide distribution in the scope response over a specified range of prevalence. The usual way is to machinate the scope in dB and phase in degrees or radians versus the logarithm of prevalence. 

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

Answer - Energy stored = 1/2 L I2 Joules where L is in henries and I is in amps. 

 

Question 3. How To Calculate Energy Stored In A Capacitance? 

Answer - 1/2 C V2 Joules where C is in farads and V in volts. 

 

Question 4. At What Base You Will Tell The Direction Of Wheel Of Dc Motors And Instituters? 

 Answer - Motors observe the left hand rule and instituters the right hand rule. 

 

 Question 5. What Is Force On Resembling Operators? 

 Answer - F = (2 I2/ d) 10 ­ 

Newtons/ rhythm where I is in amps and d is in rhythms With currents in contrary directions, the force is pushing the drivers apart. 

 

Question 6. What Is Corkscrew Rule? 

Answer - As current stampedes along a line, the entrancing field rotates in the direction of a corkscrew. 

 

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

 Answer - W = I2 R = V2/R. 

 

Question 8. What Do You Mean By Pull Of Electromagnet? 

Answer - Pu11 = B2 107/ (8) Newtons per m2 of lodestone force where B is in tesla. 

 

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

Answer - In an electric circuit, it's hourly reachable to have a voltage source rather than a current source (e.g. in mesh analysis) or vice versa. This is made possible using source transfigurations. It should be noted that only practical voltage and current sources can be transubstantiated. 

In other words, a Th ´ evenin’s alternate circuit is converted into a Norton’s one or vice versa. The parameters used in the conversion are given as follows. 

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

Norton parameters IN, RN = ⇒ RTH = RN, VTH = RN IN. Any draft resistance, RL will have the same voltage across, and current through it when connected across the stops of either source. 

 

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

Answer - Posterior oppositeness is pertained in a condition where one or fresh of your holders are connected inaccurately. To fix the posterior oppositeness, check the line connection at the outlet and scan your holder. A holder with after contrariness will have the white lacing misshaped to the hot side and the black lacing will be connected to the neutral side, if that the case exchange the lacings and it'll resolves theproblem.However, a vested electrician will be wanted, If it persists. 

 

Question 11. Explain What Does A String Of Resistors In A Series Will Do? 

Answer - When a string of resistors in a series will divide the source voltage into proportion to their values. 

 

Question 12. What Happens If The Series Current Double? 

Answer - If the series current gets double either, the resistance is halved. 

 

Question 13. What Will Be The Current If The Resistance Total In A Series Circuit Doubles? 

Answer - If the resistance totality in a series circuit doubles the current will reduce to half. 

 

Question 14. Explain What Is Beam Diodes? 

Answer - Beam diodes are compact transistor like packages with two or additional electrical leads. Lasing occurs when stimulated outflow results into the deletion of photon confined to the lasing mode. These photons hit back and forth between the rear and fore glass, and hence a diverging ray emits from the beam diode packages. 

 

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

Answer - One complete set of change in value is known aswaveform.However, either first draw an ac waveform and explain with reference to the waveform, If you any beginning question on AC waveform. 

 

Question 16. What Is Form Factor And Peak Factor? 

Answer - The proportion of rms value to average value of an ac amount is called form factor. 

Form Factor = RMS value/ Average value 

The proportion of maximum value to the RMS value of an ac amount is called as peak factor. 

Peak Factor = Maximum Value/ RMS value 

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

Answer - A generating action requires following introductory factors to exits 

 The driver or a coil. 

 The flux. 

 The relative stirring between skipper and flux. 

 Electrical Machines Interview Questions 

 

Question 18. Why Pole Shoe Has Been Given A Specific Shape? 

Answer - It's necessary that maximum area of the structure comes across the flux produced by the field winding. Pole shoe enlarges the area of structure core to come across the flux, which is necessary to produce larger moved emf. To achieve this, pole shoe has been given a particular shape. 

 

 

Question 19. Why Instituters Are Operated In Resembling? 

Answer - The instituters are operated in ditto to get, Durability and solidity of service without interruption Preservation and keeping will be easy Fruitful operation of each founder Increase in shop capacity 

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

Answer - It serves the purpose of outside most cover of the dc machine. so that the segregating material get fended from the deleterious atmospheric environmental like noise, dust and motley feasts like SO2, acidic steamsetc. 

It provides mechanical support to the poles. 

It forms a part of the charismatic circuit. 

It provides a path of low hesitance for charismatic flux. 

It's prepared by using cast iron. For large machines, rolled brand, cast brand, silicon sword is used which provides high permeability. 

 

Question 21. How To Reverse The Direction Of Twirl Of Dc Motor? 

Answer - To reverse direction of twirl of dc motor, either direction of main field produced by the field winding is reversed or direction of the current passing through the cadre is reversed. By changing the direction of current passing through the field winding, the direction of the main field can be reversed. 

 

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

Answer - If it's decided the current rung and before line installed according to the rung of final sub circuit. and we want to know that how multiple light point will be on this final sub circuit. 

Suppose for a normal lighting in a home, office or hall, the current order of sub circuit or final sub circuit is 5Amp and reservoir Voltage is 220 Volts. either how multitudinous 100 Watt Lights we can instal on that specific sub circuit. We can find the number of illuminants by using this formula. 

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

Answer - The Main Difference between Active and Passive Components Active Factors Those penchant or factors which produce energy in the form of Voltage or Current are called as Active Constituents 

For Example Diodes Transistors SCR etc … 

Passive Components Those affection or constituents which store or maintain Energy in the form of Voltage or Current are known as Passive Components 

For Example Resistor, Capacitor, Inductor etc … 

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Question 24. What Is Capacitance? 

Answer - Capacitance (C) Capacitance is the quantity of electric charge moved in the condenser (Capacitor), when one volt power source is attached across its terminal. 

 

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 applied across its layovers, ( Also known as charging of a capacitor) current morning to flow and continue to travel until the voltage across both the negative and positive (Anode and Cathode) plates run equal to the voltage of the source (Applied Voltage). These two plates are separated by a dielectric material ( parallel as mice, paper, glass,etc. which are insulators), which is used to increase the capacitance of the capacitor. When we connect a charged capacitor across a small loading, it starts to supply the voltage ( Stored energy) to that loading until the capacitor exhaustively discharges. Capacitor comes in different shapes and their value is measured in farad (F). Capacitors are used in both AC and DC systems 

 

Question 27. What Is Capacitor? 

Answer - The capacitor is a two terminal electrical device used to store electrical energy in the form of electric field between the two plates. It's also known as a condenser and the SI unit of its capacitance measure is Farad “ F”, where Farad is a large unit of capacitance, so they're using microfarads (µF) or nanofarads (nF) presently. 

 

Question 28. What Is The Business Of Capacitor In Ac And Dc Circuit? 

Answer - Business of Capacitor in AC Circuits In an AC circuit, capacitor reverses its charges as the current alternates and produces a creeping voltage (in other words, capacitor provides leading current in AC circuits and networks). 

Business and Performance of Capacitor in DC Circuit. 

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

 

Question 29. Why We Ca n’t Store Ac In Batteries Instead OfDc.or Can We Store Ac In Batteries Instead Of Dc? 

Answer - We can not store AC in batteries because AC changes their contrariety up to 50 (When commonness = 50 Hz) or 60 (When commonness = 60 Hz) times in a improvised. So the battery depots keep changing Positive (ve) becomes Negative (-Ve) and vice versa, but the battery can not change their depots with the same speed so that’s why we ca n’t store AC in Batteries. 

In addition, when we connect a battery with AC Supply, either It'll charge during positive half cycle and discharge during negative half cycle, because the Positive (ve) half cycle cancel the negative (-Ve) half cycle, so the average voltage or current in a complete cycle is Zero. So there's no chance to store AC in the Batteries. 

 

Question 30. What Is An Instrumentation Amplifier? 

Answer - An instrumentation (or instrumentational) amplifier is a type of discriminational amplifier that has been provisioned with input buffer amplifiers, which debar the need for input impedance matching and so make the amplifier particularly suitable for use in extent and test paraphernalia. 

Question 30. What Is An Instrumentation Amplifier? 

Answer - An instrumentation (or instrumentational) amplifier is a type of discriminative amplifier that has been rigged with input buffer amplifiers, which exclude the need for input impedance matching and so make the amplifier particularly suitable for use in measure and test stuff. 

Question 31. Define Modulation.? 

Answer - In electronics and telecommunications, modulation is the process of varying one or further plots of a periodic waveform, called the carrier signal, with a modulating signal that normally contains information to be transmitted. 

Question 32. What Is Am? 

Answer - Width modulation (AM) is a modulation way used in electronic communication, uttermost ordinarily for transmitting information via a radio carrier swell. In width modulation, the width ( signal strength) of the carrier swell is varied in proportion to the waveform being transmitted. That waveform may, for specimen, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of TVpixels.This way contrasts with prevalence modulation, in which the prevalence of the carrier signal is varied, and phase modulation, in which its phase is varied. 

Question 33. What Is Fm? 

Answer - In telecommunications and signal processing, frequence modulation (FM) is the encoding of information in a carrier surge by varying the instant frequence of the surge. ( Compare with extent modulation, in which the extent of the carrier surge varies, while the frequence remains constant.) 

Question 34. What Is The Purpose Of Using Data Modem? 

Answer - Short for modulator­demodulator. A modem is a device or program that enables a computer to transmit data over, for sample, telephone or string lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog swells. 

 

Question 35. What Is Zigbee? 

Answer - ZigBee is a IEEE802.15.4 rested specification for a suite of high­level communication protocols used to work subjective area networks with small, low­power digital radios. 

 

Question 36. What Is Pcb? 

Answer - A published circuit board (PCB) mechanically supports and electrically connects electronic factors using conductive tracks, pads and other features etched from bobby extents laminated onto a non­conductive substrate. 

Question 37. Define Voltage Regulator? 

Answer - A voltage control is designed to automatically maintain a constant voltage ranking. A voltage control may be a simple “ feed­forward” design or may include negative feedback control eyes. It may use an electromechanical way, or electronic elements. 

Question 38. What Is Scr? 

Answer - Thyristors or silicon controlled curatives, SCR are find multifold uses in electronics, and in particular for power control. These penchant have yea been called the serf of high powerelectronics.Thyristors are good to switch large situations of power are therefore they used in a wide variety of different plays. Thyristors yea finds uses in low power electronics where they're used in multiplex circuits from light dimmers to power repertoire over voltage protection. 

Question 39. Define Microprocessor? 

Answer - A siliconchip that contains a CPU. In the world of particular computers, the terms microprocessor and CPU are used interchangeably. At the heart of all particular computers and maximum workstations sits a microprocessor. Microprocessors also control the ratiocination of fair all digitaldevices, from timekeeper radios to fuel­injection systems for cars. 

Question 40. Define Microcontroller? 

Answer - A microcontroller (sometimes abbreviated µC, uC or MCU) is a small computer on a single compound circuit containing a processor core, memory, and programmable input/ thing peripherals.