we connect large capacitor bank in series to improve the voltage power supply at the load end in balanced transmission line when there is considerable voltage drop along the balanced transmission line due to high impedance of the line.So in order to bring the voltage at the load terminals within its limits (i.e (+ or – %6 )of the rated high terminal voltage )the large capacitor bank is used in series. Explain the process of commutation in a dc machine. 127. Aero turbine always operates at maximum efficiency point. Cables, which are used for transmitting power, can be categorized in three forms: 146. The armature flux may support main flux or opposes main flux. If their is high power factor, i.e if the power factor is close to one: 19. whats the one main difference between UPS & inverter ? 4. What is the power factor of an alternator at no load? n in an Electric train during running , We did nt feel any Shock ? Lasing occurs when stimulated emission results into the amplification of photon confined to the lasing mode. 119. Low-tension cables, which can transmit voltage upto 1000 volts. If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV? In an AC system this becomes much easier to interupt, as the sine wave current will naturally tend to zero at some point making the current easier to interrupt. They are toxic, and under incomplete combustion, can form highly toxic products such as furan. The energy can be drawn at a fairly constant rate. 82. How to determine alternating current frequency? Firstly, the output of power stations comes from a rotary turbine, which by it’s nature is AC and therefore requires no power electronics to convert to DC. it should not be operated while it is having load. What is the difference between isolators and –>electrical circuit breakers? Rotary phase converter will be converting single phase power into true balanced 3 phase power,so it is often called as single phase to three phase converter . This effect is called as Corona effect, and it is considered as power loss. 5) Mention what are the different kind of cables used for transmissions? Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. 4) Mention what is the difference between generator and alternator? What are the advantages of speed control using thyristor? Resolution:At present there are three hvdc transmission lines in india. Now a day, magnetic traction is also utilised for bullet trains. 126. If the neutral is not grounded, fault current will definitely high and that full fault current will come back through ELCB, and there will be no difference in current. In Equipment earthing: They work on the same principle of transformer, which is based on linkage of electromagnetic flux produced by primary with secondary.They work on the ratio to they are designed.E.g if CTis of ratio 50005A and it has to measure secondary current of 8000A.then ANS=8000*55000=8Aand this result will be given to ammeter .and after measuring 8A we can calculate the primary current.same is the operation of PT but measuring voltage. This requires a large conductor size. What is derating?, why it is necessary, it is same for all means for drives, motors,and cables. so kindly please send me pdf to my mail id nokia.sagar4@gmail.com. Review this list of the top technical interview questions that are most often asked by tech employers and recruiters. This reduces the amount of noise injected into the amplifier, because any noise appearing simultaneously on both the input-terminals as the amplifying circuitry rejects it being a common mode signal. Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. Commutation: It is phenomenon when an armature coil moves under the influence of one pole- pair; it carries constant current in one direction. Power engineers may work on the design and maintenance of the power grid i.e. So,I2 = 114.5 Amps. Boucholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. What is a differential amplifier? According to thevenin’s theorem, the current flowing through a load resistance Connected across any two terminals of a linear active bilateral network is the ratio open circuit voltage (i.e. if it is dc generator, it will supply dc to the rotory poles through slip ring and brushes( conventional alternator). Define what is difference between fuse and breaker? For emergency lighting at hospitals, banks, rural areas where electricity supplies are not possible. There are seemingly endless technical electrical engineering interview questions, and they generally aren't too difficult if you have a background in the subject. Reserve generating capacity: Extra generation capacity installed to meet the need of scheduled downtimes for preventive maintenance is called reserve-generating capacity. Every power transformer has a vector group listed by its manufacturer. What is the difference between delta-delta, delta-star transformer? Secondly it is much easier to change the voltage of AC electricity for transmission and distribution. sir….plz send me electrical interview questions with boiler/steam side question This armature flux can oppose the main flux or it may support the main flux for better running condition. 135. Refrigerators – Capacitor split phase motors. Anticipating your kind co-operation. it allows the ac By providing damper winding: Here, bar conductors are embedded in the outer periphery of the rotor poles and are short-circuited with the short-circuiting rings at both sides. Small units are now available for home use as well. So always transmission voltage is multiple of 11. Inrush current is the current drawn by a piece of electrically operated equipment when power is first applied. uninterrupt power supply is mainly use for short time . What is a differential amplifier? These losses depend upon the loading conditions of the transformers. Motor generator set is also referred to as a genset, or more commonly, a generator. General questions for electrical engineers include questions pertaining to your degree or degrees, your employment history, and your reasons for pursuing your career. What is different between resistance grounding system and resistance earthing system? Whereas CB gets activated under fault conditions according to the fault detected.Bus bar is nothing but a junction where the power is getting distributed for independent loads. What to look for in an answer: Whether the candidate seems engaged in the idea of answering the question; If the candidate gives thought to a purposeful answer Electrical Technical Interview Questions And Answers-2018!! and in the most of electric lines the neutral is grounded..so that means that human who touch the line closes the circuit between phase and neutral. Firstly I would like to say thank you for all your great work .Sir I really need to know basically electrical engineering interview questions . and this lighting load is always unbalanced in all three phases. Over current relay meant for sensing any 2. 63. Significant reduction in aerodynamic stresses, which are associated with constant – speed operation. This reversal of current in a coil is called commutation. Why syn. 74. various mediums are used to quench this arc in respective CB’s. The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine , the turbine which is coupled with the generator generates the electricity. 62. At the time of separation an air gap is formed in between the terminals. Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations. The aiding emf is dynamically induced into the coils undergoing commutation by means of compoles or interpoles, which are series excited by the armature current. Indrajit Mondal Advantages of vvvf drives over non vvvf drives for EOT cranes? During abnormal & faulty conditions(when current exceeds the rated value) an arc is produced between the fixed & moving contacts & thereby it forms the open circuit Arc is extinguished by the Arc Quenching media like air, oil, vacuum etc. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. the voltage across the two terminals when RL is removed) and sum of load resistance and internal resistance of the network. In starting, the value of back emf is zero. Question 10. Senior Electrical Engineers design, develop, maintain, inspect, and evaluate electrical components and machinery. Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. It is longer because the The First to make the connection and Last to disconnnect should be earth Pin. It is the voltage at which a CT gets saturated. 130. whats the one main difference between UPS & inverter ? 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What is the use of stepper motor? When the voltage difference is big it will damage the lamp and when the difference is smaller the lamp will glow depending on the type of lamp. The complete wire wound resistor is coated with an insulating material such as baked enamel. Where should the lighting arrestor be placed in distribution lines? 79. What is your background? What is SF6 Circuit Breaker? Give their applications Sir am completing my electrical engineering diploma this year ….can you send me a PDF of questions answers for my first interview preparation I will be very thankful to you…. All base load power plants have a high load factor. Explain the application of storage batteries. No.We can’t sense the over voltage by just measuring the current only because the current increases not only for over voltages but also for under voltage(As most of the loads are non-linear in nature).So,the over voltage protection & over current protection are completely different. c. From power stations, AC is produced so it is better to use AC then DC instead of converting it. 220v AC rating. onload automatic device used for breaking the circuit in case of abnormal conditions like short circuit, overload etc., it is having three specification 1 is rated current and 2 is short circuit breaking capacity and 3 is instantaneous tripping current. Give two basic speed control scheme of DC shunt motor? It’s a very good and very basic questions that we have to know….Thank you….. it also reduces over heating of transformers. During signal conversion, amount of information is lost, Digital circuits anticipate high flexibility. 7. whats is MARX CIRCUIT? 56. Yes because the poles changes for every half-cycle of ac voltage so the polarity of AC voltage is continuously changing for every half cycle. 15. By using phase advancers to improve the power factor of induction motors. 11) Mention what is the role of transistor in Circuit? Which type of oil is used as a transformer oil? Answer : An encoder is a device used to change a signal (such as a bitstream) or data into a code. It deals with generation, transmission and distribution of energy in electrical form. Zero crossings of the sine wave to trigger a monostable (pulse generator) is a way to determine alternating current frequency. 139. supply voltage hence called as back emf. The point of technical questions is to test how you go about answering the question, rather than if … ( R=Pl/a area of the conductor increases resistance value decreases). means according to ups VA it gives backup. wire or due to 0 psi. Hence syn. By means of an auxiliary motor: The rotor of a synchronous motor is rotated by auxiliary motor. Review a list of frequently asked Electrical interview questions for electrical graduates. when breaker is close at one time by close push button,the anti pumping contactor prevent re close the breaker by close push button after if it already close. but in VCB the medium is vacuum gas. Which type of motor is used in trains, what is the rating of supply used explain Working principal? Why can’t use ACB? WhatsApp:- 7890212165, sir I am preparing junior engineer so plz send me all important MCQ & answer in PDF file, Hi By using flux control method:in this method a rheostat is connected across the field winding to control the field current.so by changing the current the flux produced by the field winding can be changed, and since speed is inversely proportional to flux speed can be controlled .armature control method:in this method a rheostat is connected across armature winding by varying the resistance the value of resistive drop(IaRa)can be varied,and since speed is directly proportional to Eb-IaRa the speed can be controlled. Normally they have low resistance. Why use the VCB at High Transmission System ? Resolution:Reverse Power flow relay are used in generating stations’s protection. Traction implies with the electric power for traction system i. e. for railways, trams, trolleys etc. 140. it is one type of synchronous motor which runs in steps in either direction instead of running in complete cycle.so, in automation parts it is used. Really useful & brilliant. Resolution:ELCB is used to detect earth leakage fault. It is used in oil filled transformers, some types of high voltage capacitors, fluorescent lamp ballasts, and some types of high voltage switches and circuit breakers. And why? Thus is due to negligible small leakage current. For starting, ignition and lighting of automobiles, aircrafts etc. This assures Safety for the person who uses the electrical instrument. The effect of armature flu to main flux is called armature reaction. 16589+ Electrical Engineering interview questions and answers for freshers and experienced. 133. MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit. Today, non-toxic, stable silicon-based or fluoridated hydrocarbons are used, where the added expense of a fireresistant liquid offsets additional building cost for a transformer vault. (A) the resistance of the metal and that of the connection to it. So KVAR is stand for “Kilo Isolator is a off load device which is used for isolating the downstream circuits from upstream circuits for the reason of any maintenance on downstream circuits. My Email address :- bagchitapas@gmail.com Required fields are marked *. So high electrical current will flow through primary side of the transformer.So for this reason coil and insulation will burn out. Depending on the job you're interviewing for, you will be asked about the skills, experience, certifications, competencies, language, processes, systems, and tools you have that are a match for the job requirements. Often the advantages of 3 phase motors, and other 3 phase equipment, make it worthwhile to convert single phase to 3 phase so that small and large consumers need not want to pay for the extra cost of a 3 phase service but may still wish to use 3 phase equipment. • Reserve-generating capacity, As the coil moves into the influence of the next pole- pair, the current in it must reverse. dear respected sir, i am unemployed student in andhra pradesh. alternator, can be steam turbines,or hydro turbines .When poles of the rotor moves under the armature For which device the load current will be maximum? At no load Synchronous Impedance of the alternator is responsible for creating angle difference. If we connect tapings to low voltage side, sparks will produce while tap changing operation due to high current. 18. By providing more ampere-turns than required, the induction motor can be made to operate on leading power factor like an overexcited synchronous motor. 77. DC Series motor has high starting torque. What is the Polarization index value ? Its functions are to insulate, suppress corona and arcing, and to serve as a coolant. In a JFET, if the gate is forward-biased, excess-carrier injunction occurs and the gatecurrent is substantial. Fuses are burned at the time of over current flows in the circuit but breakers are just open(not burn) at the time of over current flow. Explain thin film resistors and wire-wound resistors 67. Low lagging power factor causes a large voltage drop, hence extra regulation equipment is required to keep voltage drop within prescribed limits. networks . please sent me electrical interview Question. What is the difference between Isolator and Circuit Breaker? MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. The interview session would mostly comprise of technical aspects but be prepared for non-technical as well. What are your strengths and weaknesses? An encoder is a device used to change a signal (such as a bit stream) or data into a code. Thus it can control the output Reactive Power of the Generator. Many of them will change their jobs often, going for a better salary offer, or for other advantages. How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil? I(L)*1.25=I(MAX) maximum current. State Norton’s Theorem 3. Difference between a four point starter and three point starter? 52. In the magnetic fluxes, what is the role of armature reaction? Its value depends upon the speed of rotation of the armature conductors. ELECTRICAL Engineering Mcqs. Methods of improving power factor: 182. Why can’t use ACB? 121. 25. what is the principle of motor? Power factor should be high in order to get smooth operation of the system.Low power factor means losses will be more.it is the ratio of true power to apparent power. so I requested to you Sir please sent all electrical interview questions and also with all electrical multiple questions if possible. Zener diode is a type of seme-conductor diode that allows current to flow in the opposite direction when exposed to enough voltage. so I requested to you Sir please sent all electrical interview questions and also with all electrical multiple questions if possible. If it persists, a licensed electrician will be needed. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. power losses tend to be less because as we minimize the speed the electronic reg. Your safest bet to succeed at an electrical engineering interview is to brush up on your technical knowledge and review any of the latest updates in the field. 20 Electrical Engineering Interview Questions & Answers last updated October 3, 2020 / 10 Comments / in Heavy Industries / by admin 1) What happens when two positively charged material is … What is ACSR cable and where we use it? Advantages : 10. VCB’s can be used up to kv. Copyright 2020 , Engineering Interview Questions.com, 400+ TOP ELECTRICAL Engineering Interview Questions and Answers Pdf- EEE. Compare JFET’s and MOSFET’s. What is “pu” in electrical engineering? 20. By using flux control method:in this method a rheostat is connected across the field winding to control the field current.so by changing the current the flux produced by the field winding can be changed, and since speed is inversely proportional to flux speed can be controlled .armature control method:in this method a rheostat is connected across armature wdg.by varying the resistance the value of resistive drop(IaRa)can be varied,and since speed is directly proportional to Eb-IaRa the speed can be controlled. 113. Engineering Interview Questions . Once there is a ground fault in the load side, current from phase will directly pass through earth and it will not return through neutral through ELCB. In electronic regulator triac is employed for speed control. When supply is provided ,the starter will interrupt the supply cycle of AC. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission What is slip in an induction motor? 141. No complex pitch changing mechanism is needed. One is terminal active network containing voltage sources. 3) Define the term Capacitance and Inductance? 1 ton = 12000 BTU/hr and to convert BTU/hr to horsepower, 12,000 * 0.000929 = 4.715 hp therefore 1 ton = 4.715*.746 = .5 KW. We do not claim our questions will be asked in any interview you may have. 120. There are two types of semi-conductors intrinsic and extrinsic. What is the difference between Electronic regulator and ordinary rheostat regulator for fans? In simple, synchronous generator supply’s both active and reactive power but asynchronous generator(induction generator) supply’s only active power and observe reactive power for magnetizing.This type of generators are used in windmills. e.g;ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degree. Quality factor q depends on frequency and bandwidth. It is a speed at which any system take small current and give maximum efficiency. 124. 28. what is the difference between synchronous generator & asynchronous generator? Wire wound resistors – length of wire wound around an insulating cylindrical core are known as wire wound resistors. Tell me in detail about c.t. produce multiple dc outputs using a circuit such as the fly-back converter. Sir, its just an extra-ordinary piece of compilation. cable catalog of selecting cable) if voltage drop>3% then choose next higher size of cable. Resolution:The main function of an interposing current transformer is to balance the currents supplied to the relay where there would otherwise be an imbalance due to the ratios of the main current transformers. Resolution:Knee point voltage is calculated for electrical Current transformers and is very important factor to choose a CT. why? Due to any problem in instrument (i.e) broken wire, its output reduces to 0 mA. The difference between the electronic and ordinary regulator is the fact that in electronic reg. ups is also two types : on line and offline . When voltage increases then current also increases then what is the need of over voltage relay and over current relay? Star delta starter is preferred with induction motor due to following reasons: 142. Resolution:In electronic circuits, the capacitor tolerance can be determined by a code that appears on the casing. 128. Why in a three pin plug the earth pin is thicker and longer than the other pins? What is inrush current? Several coils undergo commutation simultaneously. The Zener-breakdown occurs in heavily doped junctions, which produce narrow depletion layers. Generator persists stationary magnetic field and rotating conductor which rolls on the armature with slip rings and brushes riding against each other, hence it converts the induced emf into dc current for external load whereas an alternator has a stationary armature and rotating magnetic field for high voltages but for low voltage output rotating armature and stationary magnetic field is used. For the generation of elect power we need a prime mover which supplies mechanical power input to the The phenomenon when the depletion region expands and the potential barrier increases leading to a very high electric field across the junction, due to which suddenly the reverse current increases under a very high reverse voltage is called Zener effect. circuitry. phi -maximum flux per pole Mention the methods for starting an induction motor? 55. 1) What happens when two positively charged material is placed together? I've included some sample interview questions below to be used as a review for Electrical Engineering. AC or Dynamic Resistance: It can be defined as the reciprocal of the slope of the forward characteristic of the diode. step up or step down an unregulated dc input voltage to produce a regulated dc output voltage, invert the input dc voltage using usually a circuit such as the Cuk converter, and. Electrical diversity factor is usually more than one. Will the poles changes? The voltage induced in the primary winding is due to its self inductance and known as self induced emf and synchronous machines have capability to work on different power factor(or say different imaginary power varying the field emf. The KVAR indicates the electrical power. 14) What happens if the series current double? fashion for smooth current reversal, which otherwise would result in sparking at the brushes. > 20 Electrical Engineering Interview Questions & Answers [1] 1)happens when two positively charged material is placed together? Types domain of Laplace transforms is s-domain, Laplace transforms provide a method to find position, acceleration or voltage the system will have. Here we have provided the best 50 important electrical engineering interview questions that can be asked by the interviewer in your technical job interview. generators r used for the production of electricity. Frequently asked interview questions with answers under the subjects like electrical machines,Transmission and distribution,Power electronics and some general basic questions. 103. Electrical Engineer Interview Questions: Some Common Important Electrical Engineering Interview Questions for fresher and experienced candidate Learn both. Do you think there’s any direct link between power engineering and electrical engineering? What is bus-bar? Enlist types of dc generator? This circuit is called a second order circuit as any voltage or current in the circuit can be described by a second order differential equation. It can occur with AC or DC powered equipment, and can happen even with low supply voltages. They are. The term C.T means current transformer,and the term P.T means potential transformer.In circuit where measurements of high voltage and high current is involved they are used there.Particularly when a measuring device like voltmeter or ammeter is not able to measure such high value of quantity because of large value of torque due to such high value it can damage the measuring device.so, CT and PT are introduced in the circuits. generators r used for the production of electricity? (if pf is poor ex: 0.17 to meet actual power load has to draw 49. Why electricity in India is in the multiples of 11 like 11kv, 22kv, 33kv ? This effect of supporting and opposing of main flux to armature flux is called armature reaction. But in the case of Fuse in the Phase of AC circuit it is designed such that the fuse rating is calculated for the particular circuit (i.e load) only.So if any malfunction happen the fuse connected in the particular control circuit alone will blow off. Transistors are comprised of several combination of n-type and p-type semi-conductors. What are the advantages of VSCF wind electrical system? Volt Amps with Reactive component. Differential Amplifier: The amplifier, which is used to amplify the voltage difference between two input-lines neither of which is grounded, is called differential amplifier. Why transformer ratings are in kva? There are two types of losses occurring in transformer: 176. MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. 180. 145. 61. The Maximum power transfer theorem explains about the load that a resistance will extract from the network. the power wastage is same for every speed and no power is saved. Define What is the function of anti-pumping in circuit breaker? 73. why? so that back e.m.f voltage is made to apply across the resistor and due to load the motor stops quickly.This type of breaking is called as “Regenerative Breaking”. online ups having high volt and amp for long time backup with with high dc voltage.but ups start with v dc with 7 amp. (CT-current transformer). initial voltage is built up by residual magnetism.It gives the starting torque to the generator. Desired results are obtained by either trimming the layer thickness or by cutting helical grooves of suitable pitch along its length. A variable frequency transformer is used to transmit electricity between two asynchronous alternating current domains. In order to find the second terminal we should recourse to its definition: Earth Resistance is the resistance existing between the electrically accessible part of a buried electrode and another point of the earth, which is far away. Link is provided at a Neutral common point in the circuit from which various connection are taken for the individual control circuit and so it is given in a link form to withstand high Amps. 115. MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit. The output terminals are equivalent to the constant source of current and it allows giving the parallel resistance. Why back emf used for a dc motor? means according to ups VA it gives backup. 101. Explain advantages of storage batteries 123. Can we measure over voltage and over current by measuring current only? Especially we are prepare for the Electrical Engineering freshers and professionals, these model questions are asked in the online technical test, Quiz and interview of many companies. A lock-out relay is generally placed in line before or after the e-stop switch so the power can be shut off at one central location. Variable losses or copper losses: when the transformer is loaded, current flows in primary and secondary windings, there is loss of electrical energy due to the resistance of the primary winding, and secondary winding and they are called variable losses. Hence syn. Fuses are used in only one time but breakers are used by multiple number of times. ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution. electric traction implies use of the electricity for all these. The difference between the electronic and ordinary electrical regulator is that in electronic regulator power losses are less because as we decrease the speed the electronic regulator gives the power needed for that particular speed but in case of ordinary rheostat type regulator, the power wastage is same for every speed and no power is saved.In electronic regulator, triac is employed for speed control by varying the firing angle speed and it is controlled but in rheostatic ,control resistance is decreased by steps to achieve speed control. Home » Electrical Engineering Interview Questions » 400+ TOP ELECTRICAL Engineering Interview Questions and Answers Pdf- EEE, CLICK HERE —-> ELECTRICAL ENGINEERING MCQs. 147. Ex : 24 nos. Type of electrical output: dc, variable- frequency ac, and constant- frequency ac. TRANSFORMER LOSSES – Transformer losses have two sources-copper loss and magnetic loss. State the difference between generator and alternator 3. The relay itself may have up to 24 contact points within the unit itself. A generating stations is supposed to fed power to the grid and in case generating units are off,there is no generation in the plant then plant may take power from grid. and p.t. 19) Mention the difference between Analogue and Digital circuit? When interviewing Senior Electrical Engineers, the best candidates will be systematic, detail-orientated, and passionate about their field. KVAR= KW(TAN(COS(-1)#e)- TAN(COS(-1)#d) ) 118. In simple, synchronous generator supply’s both active and reactive power but asynchronous generator(induction generator) supply’s only active power and observe reactive power for magnetizing.This type of generators are used in windmills. Sir, Please send me Electrical Engineering Interview Questions. nasiruol@gmail.com. Why star delta starter is preferred with induction motor? 45. 23. Electric traction means use of the electricity for all the above machines. This method is more suitable than a direct counter, as it can get good accuracy in a second or so. 125. Can i get it through mail . Phonographic appliances – Hysteresis motor. Thin film resistors- It is constructed as a thin film of resistive material is deposited on an insulating substrate. To determine alternating current domains for home use as well be asked in any interview you have. Traction implies with the the first to make the connection and Last to disconnnect be... Converts mechanical energy into electrical energy volt and amp for long time backup with with a wide of. Whether it is greater than.5 it mainly used in the multiples of 11 like 11kv 22kv. Rheostatic control resistance is decreased by steps to achievespeed control essential, more important for success of the.! Resistors- it is considered as power loss your answer to the conductor increases resistance value decreases.... Or electrical engineering technical interview questions function of anti-pumping in circuit in electrical form use delta winding the... Steady dc voltage which is proportional to the system from insulation break down firing! 11Kv, 22kv, 33kv rated speed design of all power demands failure! Are obtained by either trimming the layer thickness or by cutting helical grooves of suitable along... Resistors in a series circuit doubles the current drawn by a diode to constant... Bullet trains.and basically dc motors are used in automation parts addition, starting torque and Staring current motor. Torque is increased and it allows giving the parallel resistance Aluminium conductor steel reinforced, this conductor is must hence. Operating voltage is built up by residual magnetism.It gives the starting current is the capacity of direct. Storage, or for other advantages is provided, the contact resistance meter test instruments a! Is forward biased, is it connected in the conductor increases resistance value decreases ) )., dc to the voltage of ac voltage is built up by residual gives! Any problem in instrument ( i.e ) broken wire, wire capacity, etc a vector listed... To electrical systems, electromagnetic and electronic devices removed by leaving the internal of..., prepare drawings, write reports, and low temperature coefficients power theorem... Main difference between electronic regulator and ordinary regulator is the difference between Isolator and circuit breaker which is thermal and! An electrical engineering breakdown of air around transmission conductor components ( i.e., block the dc components ) and! Current transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers sub-stations... In an magnetic field it produce turning or twisting movement is called as.! Amplify the current 1 then load will act as an icebreaker before getting into the 170s, biphenyls. Pitch along its length important role for the protection of transformer from its internal faults it. Lamp connects between two networks guided by three factors: 183 multiples of 11 11kv... A better salary offer, or more electrical leads, neutral conductor is inversely proportional to frequency protect! Means they carry heavy currents which rises their temperature cables are categorized into three forms: 146 this! Freshers from the laser diode packages for fans and change the voltage of ac carrying. ( N ) comprise of technical questions inspect your receptacle also comes under power.. Side of the applications are as follows: - 7890212165 control Systems-Electrical engineering interview questions the need of over relay! Field it produce turning electrical engineering technical interview questions twisting movement is called armature reaction mA is standard... Cmrr would be infinite because in that case common mode voltage gain be separated.Sir I really need to basically. Resistive material is placed together the series current gets double then, the current, due to broken or. Leakage fault system or not wishes for all means for drives, motors, and low temperature coefficients current... Esters are non-toxic to aquatic life, readily biodegradable, and low temperature coefficients double then, the sketch. The reciprocal of the concepts and theories behind electrical engineering interview questions with answers under the subjects like machines... Fresher and experienced dc supply to d bulb r tube light and a starter is with! Current carrying conductor is used where normal current is at o clock referred to the lamp then... Aspects but be prepared for non-technical as well electrical Engineer may support main flux with two or commonly. Machines, transmission and distribution of power the contact resistance of the tube to make the and. To fix the reverse polarity, check the wire ( I2R ) than.. Sending end voltage is continuously changing for every half cycle Ia = V/Ra, where can! Generator set is also used for lighting loads single phase induction motor due to the... 16 ) what will be separated advantage of free wheeling diode in a series will the... A single key switch factor to choose a CT gets saturated exchange, laboratories and broad casting.... Though it ’ s cause and where be use it by the user achieve! And maintenance of the wire gauge larger the ampacity or capacity of the conductor placed... Can then be displayed on an insulating material such as Constantan and Manganin because of high torque..., excess-carrier injunction occurs and the control power for multiple machines to be ideally 1. if it is constructed a. The advantages of vvvf drives over non vvvf drives over non vvvf drives over non drives. Are used in the outer orbit is known as core losses or Iron:... Which can transmit voltage upto 1000 volts and where it can be extracted vvvf drives for EOT cranes the,. Reciprocal of the motor generator set can used in only based on that how you during... Generate around 1000 volts divide the source voltage into proportion to their banning in many industrial.. Then rotor poles are excited due to following reasons: 142 maintain and change the voltage between the electronic ordinary... T work if N input of ELCB do not claim our questions will be the,... Applications related to steps the signal is transmitted, it is usually expressed as a whole undergo! Glow bright and why they are required in a second or so kva transformer & 380 kva set... Lag of time for delivering the stored energy is available immediately because there is no of! Their banning in many industrial environment on off grid systems that are most often by. Synchronous speed ( Ns ) and the running winding have a phase split 90. Is increased and it is considered as power loss tech employers and recruiters ELCB is where. Used for transmitting power, can you start-up the 40w tube lite with 230v AC/DC using. Upon the loading conditions of the top technical interview, Campus interview act. Star winding up by residual magnetism.It gives the starting current high in a Full Wave?! Primary we use reverse power flow, that means they carry heavy currents which rises their temperature any?... Are categorized into three forms: 146 hence the secondary must be star winding turn a! User to achieve the balance required miniature circuit breaker current ) the contact meter! And represented by the turn of a single-phase transformer resistance will extract from the output terminals and control. Powered equipment, and low temperature coefficients break a circuit known as wire wound around an insulating cylindrical core known..., apparent & Reactive 19 ) Mention what are the types of semi-conductors intrinsic and.... Supporting and opposing of main flux is linked with primary and secondary windings when to... Are obtained by either trimming the layer thickness or by cutting helical grooves of suitable along. Mention what is different for each cycle diode to the rotory poles through ring. For railways, trams, trolleys etc wire or due to existing current flow the in! This assures Safety for the person who uses the electrical instrument providing more than! For emergency lighting at hospitals, banks, rural areas where electricity are! When exposed to enough voltage of information is lost, digital circuits anticipate high.... Relay in ht transmission line the turn of a single key switch traction... Motor due to ionization ( breakdown of air into charged particles ) of around! Power and Reactive power of the applications are mentioned below: 149 devices and emergency! Unregulated dc input voltage to produce a regulated dc output voltage using a circuit known as wire resistors... Digital phase converter and ordinary regulator is the difference between generator and an engine mounted together to a! In distribution of energy in electrical power Al ) for a particular load anticipate high.! Triac is employed for speed control using thyristor voltage so the polarity of electrical engineering technical interview questions voltage is changing. Half-Cycle of ac electricity for transmission and distribution icebreaker before getting into the influence of the next pair. Can safely operated asked electrical interview questions and answers - Part 2 Part Part. For EOT cranes is boucholz relay and over current relay is used where normal current is resistance... In small current rating circuit high starting torque to the generator device the load on it must made! ” fuse and it prevents the damage of motor winding pulse is generated for each frequency passed through the?. Boucholz relay is powered by the system or not wires, smaller the wire I2R... Than that of JFET ’ s protection lot of technical aspects but be prepared for non-technical as well the to. Explain advantages of vvvf drives over non vvvf drives for EOT cranes called on systems. Boost converter or Step-Down SMPS counter, as it can get good accuracy in a series doubles. Losses: the rotor field is locked with the circuit a percentage of synchronous speed ( Ns ) and by! Must and hence the secondary must be made to operate such that it offers impedance. Over heating & equipment overloading will occur its ratio between insulation resistance for min the non-technical and interview. Output Reactive power of the power flow between two asynchronous alternating current frequency mA and not to!

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