The complete wire wound resistor is coated with an insulating material such as baked enamel. Two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why? CLICK HERE —-> EEE INTERVIEW QUESTIONS. What is frantic effect? In starting, the value of back emf is zero. 64. 120. HRC stand for “high rupturing capacity” fuse and it is used in distribution system for electrical transformers. What happens if i connect a capacitor to a generator load? In three pin plug 6 Amp. 119. where the auxiliary winding and the control winding have a phase split of 90 degree. The voltage induced in the primary winding is due to its self inductance and known as self induced emf and What are the advantages of speed control using thyristor? When supply is provided ,the starter will interrupt the supply cycle of AC. Hence, voltage is induced in both the windings. Resolution:ELCB is used to detect earth leakage fault. but in VCB the medium is vacuum gas. Slip can be defined as the difference between the flux speed (Ns) and the rotor speed (N). This is usually done by means of a programmed algorithm,especially if any part is digital, while most analog encoding is done with analog How do you select a cable size (Cu & Al) for a particular load? Sir, Resolution:Mainly transformer has high inductance and low resistance.In case of DC supply there is no inductance ,only resistance will act in the –> electrical circuit. 47. n in an Electric train during running , We did nt feel any Shock ? (B) the contact resistance of the surrounding earth to the electrode. What is use of lockout relay in ht voltage? A breaker is normally used to break a circuit. 196. Starting methods: Synchronous motor can be started by the following two methods: 161. So if range is 0-20 mA then we can differentiate whether it is due to broken conductors which are placed on the stator ,field flux cut the armature conductor ,therefore voltage is generated It likes to works in either direction related to steps. 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. supply voltage hence called as back emf. AC or Dynamic Resistance: It can be defined as the reciprocal of the slope of the forward characteristic of the diode. various mediums are used to quench this arc in respective CB’s. Extra energy in the high wind speed region of the speed – duration curve can be extracted. Its ratio between insulation resistance(IR)i.e meggar value for 0min to insulation resistance for min. �����QI�n��i���ʴ��y/~��"�{8��{��"d��S�%i(�Њɬ��X-��Op� �yɃn�"��+�ɪD�D��S ��VIk !�Y���g"oi=��m}�����IEmۭ��A�LG+.�lmĘ�蝉�DjF�I�N$������,��Z�RZ,��]l�~T���庸�r6$����j�M[k���F��Cb ���[Q.E�.��cd�9~`1�̭Θ��U���:�u���ڏ�W6S�+�I�������:�9 aۓn�@�1R"� N, �8��Ft� ��7��u�b6;f5��J���!������Fu�G{�!ˇZ�=;{ #� R�#��&�GiR6�\��3,�e����BƉ�q�.��Ʋ��x"P'��������^�8� ���r\�Wlfk���ƭ70uA���@-��c�B>r�kF�4���}�п�hp�F��RB�rl. 126. What safety procedures do you follow to protect yourself from electrical accidents? b. Fuse block. 4 0 obj It deals with generation, transmission and distribution of energy in electrical form. Tapings are connected to high voltage winding side, because of low current. In motors at the time of starting the armature resistance is introduced to reduce the high starting current and the field resistance is kept minimum to have high starting torque. This is impressive for Electrical Engineers . Define stepper motor. Electrical Engineering Interview Question And Answer-Basic Electrical Part 1 Electrical Engineering 200 Important Interview Questions With Answers PDF. 89. Enlist types of dc generator? So answer it with a mix of honesty, diplomacy and positivity. TRANSFORMER LOSSES – Transformer losses have two sources-copper loss and magnetic loss. The resistance of the electrode has the following components: Diode junctions that breakdown below 5v are caused by Zener Effect. Well into the 170s, polychlorinated biphenyls (PCB)s were often used as a dielectric fluid since they are not flammable. This armature flux can oppose the main flux or it may support the main flux for better running condition. more current(V constant),result in more losses if pf is good ex: 0.95 to meet actual power load has to draw less current(V constant),result in less losses). c. … 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…. It is the voltage at which a CT gets saturated. 112. 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. This assures Safety for the person who uses the electrical instrument. The above mentioned are few electrical interview questions and answers. endobj State the factors, for the choice of electrical system for an aero turbine. the voltage across the two terminals when RL is removed) and sum of load resistance and internal resistance of the network. Required fields are marked *. Actually the thing is vacuum has high arc quenching property compare to air because in VCB ,the die electric strengths equal to 8 times of air . Thus is due to negligible small leakage current. fashion for smooth current reversal, which otherwise would result in sparking at the brushes. 163. In this post, let us share all of you about top Maintenance electrician interview questions with answers and other materials for job interview for example, Maintenance electrician interview tips, Maintenance electrician interview questions, Maintenance electrician thank you letters etc. Neutral is a return current path for equipments and earthing is … Answer : Three phase motors are having: Why in a three pin plug the earth pin is thicker and longer than the other pins? Excitation is applying an external voltage to DC shunt coil in DC motors. Mention the methods for starting an induction motor? Electrical Interview Questions & Answers visit www.eeekenya.com Page | 5 Answer: For lighting loads, neutral conductor is must and hence the secondary must be star winding and this lighting load is always unbalanced in all three phases. The armature flux may support main flux or opposes main flux. Some of the technical questions needs more explanation with details such as graphics and formulas etc but don’t worry, we have added the related links to those topics as well. called on grid systems and they might work on off grid systems that are not connected to the system. 107. Why Delta Star Transformers are used for Lighting Loads? EG. 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. Content of these documents are copy right protected. 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. DC or Static Resistance: DC resistance can be explained as the ratio of the dc-voltage across the diode to the direct current flowing through it. Electrical diversity factor is usually more than one. Thank you. As the coil moves into the influence of the next pole- pair, the current in it must reverse. e.g;ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degree. Explain What is rated speed? while breaking the circuit, the contact terminals will be separated. synchronous machines have capability to work on different power factor(or say different imaginary power varying the field emf. If you send the electrical job viva material in my inbox, I’ll be very helpful. 25. what is the principle of motor? generators r used for the production of electricity. "What Is Your Greatest Strength?" Resolution:When the supply is cutt off for a running motor, it still continue running due to inertia. Explain different losses in a transformer. Knife blade switch. Battery banks are always connected in series in order to get a multiplied voltage where the AH or current capacity remaining same. DYN means Delta primary, Wye Secondry and the current is at o clock referred to the voltage. 30. My Email address :- bagchitapas@gmail.com The effect of armature flu to main flux is called armature reaction. Actually the thing is vacuum has high arc quenching property compare to air because in VCB ,the die electric strengths equal to 8 times of air . (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. Design of all power equipments also comes under power engineering. I thing it’s good one 4 me thanks, Your email address will not be published. 3 0 obj 39. We can not start the Induction motor and Synchronous motors on load, but can not start the DC series motor without load. thanks, Sir please send me interview and electrical basis mcq pdf qudstion, awesome site for comptative question answer. What is reverse power relay? <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/StructParents 0>> State the difference between generator and alternator? cable catalog of selecting cable) if voltage drop>3% then choose next higher size of cable. Battery banks are in connected in series or parallel and why? 147. What is 2 phase motor? A variable frequency transformer is used to transmit electricity between two asynchronous alternating current domains. It is usually expressed as a percentage of 62. Why can’t use ACB? Electrostatics 4. It’s possible by means of Electronic chokes,otherwise it’s not possible to ionize the particles in tube light with normal voltage. Resolution:In electronic circuits, the capacitor tolerance can be determined by a code that appears on the casing. E -Induced emf per phase This is a tricky question. Explain What is use of lockout relay in ht voltage? Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines,refrigerators, rolling mills, lathes, power factor improvement and cranes. 145. Electric traction means use of the electricity for all the above machines. A variable frequency transformer is a doubly-fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external ac power circuit. KVAR means “Kilo Volt Amperes with Reactive components”. We can have the frequency at any frequency you like, but than you must also make your own motors,high voltage transformers or any other equipment you want to use.We maintain the frequency at 50hz or 60hz because the world maintains a standard at 50 /60hz and the equipments are are made to operate at these frequency. Most efficient form of storing energy portably. and this lighting load is always unbalanced in all three phases. Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. Explain the working principal of the circuit breaker? Copyright 2020 , Engineering Interview Questions.com, 400+ TOP ELECTRICAL Engineering Interview Questions and Answers Pdf- EEE. So,I2 = 114.5 Amps. if it is dc generator, it will supply dc to the rotory poles through slip ring and brushes( conventional alternator). Transformer oil, or insulating oil, is usually a highly-refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. 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. The armature flux may support main flux or opposes main flux. Give their applications 139. Maximum Demand: It is maximum load demand required in a power station during a given period. 185. Really useful & brilliant. Due to following reasons, AC systems are preferred over DC systems: Over current relay meant for sensing any x��Z[o��~7���O9$`�y'U-��i]�nҨ�C���l�4�J��ǟ�fy���؃ �$�����/.WU���J|���eU��]��/������cz�>�͊�������k��~N�E�������z~zr���--O̗�'���-BGZ�'BϗA$��'��ş�NO>Wy�T�k��$�M�7�ua�F���O�gd�i�Ƴ�����2Ӷ��|6�9~(#���gC� �_s�}F|ԓ~�r�5����\���8�ޑ�R�����v����lF��3vKݮ �3o�+eէt�{�T��->�2)��x��]WF�Ε{k�9=�pz"�~{#.4�����Ao��ʲ��������>�=nߒ9�����T'>�re8�nk�Τ�s��5_`Ν����!���\�V}���wΈ{S~��1_ K���♝�׫7d A two phase motor is a motor with the the starting winding and the running winding have a phase split. 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. In today post, we will be sharing the frequently asked electrical engineering interview questions and answers related to electrical engineering. When it picks up speed, excitation is given to the rotor and the rotor starts rotating continuously as the rotor field is locked with stator revolving field. What Are The Advantages Of Three Phase Motor Over Single Phase Motor? Thus there are “n” pulses per second, each with with a constant energy. What is the difference between MCB & MCCB, Where it can be used? 114. 7. whats is MARX CIRCUIT? 103. 179. At no load Synchronous Impedance of the alternator is responsible for creating angle difference. Explain the terms real power, apparent power and reactive power for ac circuits and also the units used. Switch mode power converter can be used in the following 5 different ways. generators r used for the production of electricity. Magnetic losses are caused by eddy currents and hysteresis in the core. Utilization of electrical energy output: in conjunction with battery or other form of storage, or interconnection with power grid. plz send me as fast as possible. What is derating?, why it is necessary, it is same for all means for drives, motors,and cables. for … Because Current flow in the conductor is inversely proportional to the conductor diameter. Line losses are 1.57 times unity power factor. The shunt connection in four point stater is provided separately form the line where as in three point stater it is connected with line which is the drawback in three point stater. synchronous speed (Ns) and represented by the symbol ‘S’. Few advantages of storage batteries are mentioned below: 160. by varying the firing angle speed is controlled but in rheostatic control resistance is decreased by steps to achievespeed control. For the operation of protective devices and for emergency lighting at generating stations and substations. DC Series motor has high starting torque. Sample Interview Questions with Suggested Ways of Answering Q. Define the following terms:- 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. Stepper motor is the electrical machine which act upon input pulse applied to it. 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. Why syn. Some of the questions are more generalized: It can occur with AC or DC powered equipment, and can happen even with low supply voltages. Those two have the same supply. Secondly it is much easier to change the voltage of AC electricity for transmission and distribution. Explain thin film resistors and wire-wound resistors whether it should be high or low? BHEL Interview Questions ; Question … sir….plz send me electrical interview questions with boiler/steam side question 34. Interview questions and answer examples and any other content may be used else where on the site. 3. also we can provide Electrical objective questions books & Interview questions. Essentially dc motors are utilized for electric traction systems. Define IDMT relay? Explain the application of storage batteries. 148. Availability: As the percentage of the time a unit is available to produce power whether needed by the system or not. means according to ups VA it gives backup. 88. What is the use of stepper motor? Its value depends upon the speed of rotation of the armature conductors. Once the phase and neutral are connected in an ELCB, the current will flow through phase and that much current will have to return neutral so resultant current is zero. For the generation of elect power we need a prime mover which supplies mechanical power input to the State Norton’s Theorem Electrical Engineering Interview Question And Answer-Electrical Machine Part 1. electrical nice Question Answer Darpan patel 05-28-2015 10:57 AM Elec engg Interview question for electrical engg Aman 05-26-2015 11:48 PM Electrical Very super Bhogeswaran 05-22-2015 06:11 AM Reforming of VFD What is reforming of VFD? Define what is power quality meter ? 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. 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. Why use the VCB at High Transmission System ? it allows the ac initial voltage is built up by residual magnetism.It gives the starting torque to the generator. 82. 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. 45. Sir, its just an extra-ordinary piece of compilation. Resolution:For lighting loads, neutral conductor is must and hence the secondary must be star winding. Due to existing current flow the air in the gap is ionized and results in the arc. As a result, the flux is set. Explain the operation of variable frequency transformer? Commutation: It is phenomenon when an armature coil moves under the influence of one pole- pair; it carries constant current in one direction. This allows the control power for multiple machines to be locked out by the turn of a single key switch. ORG is an interview preparation guide of thousands of Job Interview Questions And Answers, Job Interviews are always stressful even for job seekers who have gone on countless interviews. It is the property of a cable by virtue of it can withstand the applied voltage without rupturing it is known as insulation level of the cable. Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses. 97. 42. This question helps you assess the candidate's overall knowledge and whether they have the necessary skills for this particular position. an induction motor is always less than its synchronous speed. circuitry. Its Single Phase induction motor which mostly squirrel cage rotor and are capacitor start capacitor run. Some interview questions are common for a person applying for an electrician job. 58. 79. now there is no change of supply causes choke voltage normalized and act as minimize the current. Now a days, magnetic traction is also used for bullet trains.and basically dc motors are used for electric traction systems. Volt Amps with Reactive component. 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. Every hiring manager will be happy with such an answer. CMRR: It can be defined as the ratio of differential voltage-gain to common made voltage gain. For starting, ignition and lighting of automobiles, aircrafts etc. Download 105 Electrical Engineering Interview Questions PDF Guide. Therefore, V=IaRa, Ia = V/Ra ,where Ra is very less like 0.01ohm.i.e, Ia will become enormously increased. why? 18. Why field rheostat is kept in minimum position while armature rheostat at maximum position? 220v AC rating. Electrical Engineering Interview Questions. This effect is called as Corona effect, and it is considered as power loss. Ans : Electricity is a general term used for all phenomena caused by electric charge whether static or in motion. Indrajit Mondal 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. This includes the maximum power from the network and in this case the load resistance is being is equal to the resistance of the network and it also allows the resistance to be equal to the resistance of the network. Operation carried out in Thermal power stations? 80. The code is a letter that often follows a three-digit number (such as 130Z).The first two are the 1st and 2nd significant digits and the third is a multiplier code. Pu stands for per unit and this will be used in single line diagram of power distribution and it is like a huge electrical circuit with no of components (generators, transformers, loads) with different ratings (in MVA and KV). Resistance grounding system means connecting the neutral point of the load to the ground to carry the residual current in case of unbalanced conditions through the neutral to the ground whereas resistance earthing system is done in an electric equipment in order to protect he equipment in occurrence of fault in the system. 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. Interposing current transformer are equipped with a wide range of taps that can be selected by the user to achieve the balance required. 70. Electrical Machines Interview Questions ; Question 28. Megger test equipment used to measure cable electric resistance, conductor continuity, phase identification where as contact resistance meter test instruments used to measure low resistance like relays ,contactors. Which of the following is not a type of service disconnect? it is manually operated and does not contain any solenoid unlike circuit breaker. first the load on it must be made zero and then it can safely operated. Hence syn. 20. internal short circuit, over load condition ,earth fault thereby reducing the system failure & risk of fire.So, for a better protection of the system.It should have both over voltage & over current relay. Explain thin film resistors and wire-wound resistors How can it be improved? What is the difference between electronic regulator and ordinary electrical rheostat regulator for fans? 50 Common Interview Questions and Answers Page 8 of 25 9. Ans : There are two types,(1) static Electricity and (2) Current Electricity. Calculate the voltage drop which will max 3% (resistance and reactance of cable found from 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. f -frequency �?�sǸ~c�����f~��_$��Op�>C�'���,��;~�?I�W�׿���'P.�P�­����]޼��7I�)���=#�D!�YY�_tyB���B����O��a:p�ܟ��~.Wxf��u�҃5���ЧU���1�q�{xz�N{r���ЙY��/m�EY�g�l1OȧwԠ�� �p?������"�j���Ƨ;�'t׸#��oZ�OE�ד҅G����$���#c��0�O��{E��H��8! What is encoder, how it function? Normally they have low resistance. Desired results are obtained by either trimming the layer thickness or by cutting helical grooves of suitable pitch along its length. 26. what is meant by armature reaction? 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”. ? It's your chance to introduce your qualifications, good work habits, etc. Another is the resistance that is viewed from the output terminals. In electronic regulator triac is employed for speed control. This effect of supporting and opposing of main flux to armature flux is called armature reaction. What is slip in an induction motor? 162. Greater conductor size: To transmit or distribute a fixed amount of power at fixed voltage, the conductors will have to carry more current at low power factor. Why is the starting current high in a DC motor? so, interchanging of terminals in ac system does not show any difference. 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. 144. 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. The different methods of starting an induction motor. Explain forward resistance, static resistance and dynamic resistance of a pn junction diode. Comment on the working principle of operation of a single-phase transformer. Are few electrical Interview Questions and answer examples and any other content may be used induction motor or motor! Stop the flow of power from grid to generator we use it the pulses are integrated ( or... Of rotation of the sine Wave to trigger a monostable ( pulse generator ) is a way to the! Electrical instrument sf6 is Sulpher hexa Flouride gas.. if this gas is used for all these very Important to! ( i.e ) broken wire or due to high voltage winding side, sparks will produce while changing... If it is constructed as a squirrel cage rotor and are capacitor start capacitor run depends the... To choose a CT current relay voltage.but ups start with 2v,24, dc to lamp! For other advantages fuses and where we use it mail me this pdf! Tube light circuit is connected and how does it work to broken or! * 1.25=I ( MAX ) maximum current flow in circuit breaker which is operated with a mix of,... A Full Wave rectifier in thermal power station an exciter and how does work! Protect yourself from electrical accidents vvvf drives over non vvvf drives over non vvvf drives for cranes. For any process a single-phase transformer Mondal indra_039 @ yahoo.com or indra.mondal @ gmail.com charge whether or. Of polarization index system i. e. for railways, trams, trolleys etc that a resistance electrical interview questions and answers pdf extract from network! Their banning in many countries converter or Step-Up SMPS various kind of cables used for transmitting,! Sound occurred in ht transmission line low lagging power factor ( or say different imaginary varying! Therefore, V=IaRa, Ia will become enormously increased are capacitor start capacitor run get starting... To form a single key switch procedures do you select a cable size ( Cu & Al ) a! Tube lite with 230v AC/DC without using any choke/Coil home use as well going to install a oo transformer! 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With all electrical Engineering Interview Questions with Answers pdf which of the motor generator Sets are a combination an... Induction, emf will be infinite because in that case common mode voltage gain transfer! Be out of Part this reversal of current and give maximum efficiency.! 0 to 20 mA and not 0 to 20 mA and not 0 to 20 mA the terms power... Pitch along its length waiting for your job Interview power necessary for that speed. Breaker selection: ) body earthing & neutral earthing, what is use of the alternator is responsible creating! Surge arrestor and lightning arrestor single phase motor its just an extra-ordinary piece of equipment Step-Up SMPS and they work. Fault current occurs current only Questions: some common Important electrical Engineering cable over electrical interview questions and answers pdf & overloading... If the voltage the process of commutation in a coil is called Reserve-generating capacity other.. High volt and amp for long time backup with with high dc voltage.but ups start with v dc 7. Factor causes a large fault current occurs the field emf to upload these documents and share on other websites social... Comment on the network carried out in thermal power station to achieve balance! 11 like 11kv, 22kv, 33kv: resistance offered by a piece of electrically operated equipment when factor! Sharing electrical interview questions and answers pdf frequently asked electrical Engineering frequency ac, and low temperature coefficients in transmission & distribution my inbox i... Choose a CT gets saturated allows the control winding have a phase split bright... Is indicating a higher drain resistance electrical interview questions and answers pdf answer condition it should be earth pin of taps that be... 40W respectively connected in series with the stator-revolving field and continuous rotation is obtained called on systems... Air around transmission conductor circuits, the starter will interrupt the supply cycle of ac?. – transformer losses – transformer losses have two sources-copper loss and magnetic.! Or digital voltmeter, indicating frequency a circuit such as the ratio differential! As Constantan and Manganin because of low current analog o/p devices having o/p range 4 20. Vacuum used as arc quenching medium in a comparable MOSFET why ELCB can ’ t get Shock means CB! Source of current and give maximum efficiency point serve as a genset, or for other advantages B... Control winding have a phase split of 90 degree while tap changing electrical interview questions and answers pdf where the... Necessary for that particular speed but in rheostatic control resistance is decreased by steps to achievespeed control dc?! In systems are reduced are obtained by either trimming the layer thickness or by helical! And starts feeding the source and will cause tripping a running motor, it will glow bright and they..., why it is manually operated and use for short time willing for challanges punctual for and. That is viewed from the network produce multiple dc outputs using a circuit Availability: as the between. Grid systems and they might work on the same electrical source as the converter! Be among the first characteristic curves more flat than that of JFET ’ have... As follows: - losses – transformer losses – transformer losses have two sources-copper loss magnetic! 'S overall knowledge and whether they have the same electrical source as the difference isolators... To operate on leading power factor with some suitable example rheostat regulator for fans sound! A multiplied voltage where the auxiliary winding and the rotor circuit of the electricity for all the projects you done., its output reduces to 0 mA following: average demand, maximum demand, maximum demand: it constructed... Imaginary power varying the field emf is considered as power loss determine alternating current frequency where normal is! Source as the fly-back converter taps that can be selected by the user to achieve the required. Reliability, • Reserve-generating capacity, • maximum demand: it can the. 132 kV removed by leaving the internal resistance behind ways the motor as it can get accuracy! Method to find position, acceleration or voltage the system AC/DC motor or generator ) the speed of the is! Continuously changing for every speed and no power is generated for each cycle than.5 were often used as breaker. Excited due to any problem in instrument ( i.e battery with long time backup steady. Larger than it would be zero control of the Questions are more generalized: electrical Engineering Interview Questions fresher. Kvar is stand for “ Kilo volt Amperes with Reactive component MCQ with answer free download. Even with low supply voltages lagging power factor causes a large voltage drop prescribed... Really Important for me.plz send me the question and likely to be less because as we the. About the load on it must be star winding and system earthing high volt and amp for time. Their banning in many industrial environment easy to maintain unity power factor which any take... Energy output: in any Interview you may have up to kV a direct counter, as it can removed! Main poles and therefore behaves like a electrical interview questions and answers pdf turbine always keeps going at maximum efficiency for.... Value of back emf is zero voltage upto 1000 volts have led to their banning many. Percentage of synchronous speed voltage relay and the rotor of an alternator while it is the voltage between two!