What is the function of interposing current transformer? 81. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phace difference between the current and voltage. ? Required fields are marked *. 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. Only one of the terminals is evident in the earth resistance. State Norton’s Theorem Due to any problem in instrument (i.e) broken wire, its output reduces to 0 mA. 165. What are the different methods for the starting of a synchronous motor. What is the difference between delta-delta, delta-star transformer? 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. Zener-breakdown or Avalanche breakdown may occur independently or both of these may occur simultaneously. What does the KVAR means? 86. why? (pu = actual value/ base value). A variable frequency transformer is used to transmit electricity between two asynchronous alternating current domains. 93. What are the advantages of star-delta starter with induction motor? 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. 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”. 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. 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. Diode junctions that breakdown below 5v are caused by Zener Effect. At the time of separation an air gap is formed in between the terminals. What is the difference between earth resistance and earth electrode resistance? 4 0 obj 57. Starting in the early 170s, concerns about the toxicity of PCBs have led to their banning in many countries. 15. In the magnetic fluxes, what is the role of armature reaction? Some interview questions are common for a person applying for an electrician job. and this lighting load is always unbalanced in all three phases. What is the difference between MCB & MCCB, Where it can be used? 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. if it is an ac excitor, out put of ac excitor is rectified by rotating diodes and supply dc to main fixed poles.ac excitor is the ac generator whose field winding are stationary and armature rotates. 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 ? 112. a. Resolution:Series motor cannot be started without load because of high starting torque. We can not start the Induction motor and Synchronous motors on load, but can not start the DC series motor without load. These wires are made of materials such as Constantan and Manganin because of their high resistivity, and low temperature coefficients. 2 Updated from: Top 10 electrical supervisor interview questions with answers To:` Top 52 electrical supervisor interview questions with answers On: Mar 2017 3. ( R=Pl/a area of the conductor increases resistance value decreases). generators r used for the production of electricity. 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. Design of all power equipments also comes under power engineering. 143. Explain thin film resistors and wire-wound resistors Tapings are connected to high voltage winding side, because of low current. uninterrupt power supply is mainly use for short time . CMRR: It can be defined as the ratio of differential voltage-gain to common made voltage gain. Star delta starter is preferred with induction motor due to following reasons: 142. Those two have the same supply. 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. 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…. Operation carried out in Thermal power stations? Since the power factor of transformer is dependent on load we only define VA rating and does not include power factor .In case of motors, power factor depend on construction and hence rating of motors is in KWatts and include power factor. Also, explain CMRR. So,I2 = 114.5 Amps. Why field rheostat is kept in minimum position while armature rheostat at maximum position? while breaking the circuit, the contact terminals will be separated. Which type of oil is used as a transformer oil? 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. The different methods of starting an induction motor. How to determine alternating current frequency? So better equip yourself with the basic understanding and all the projects you had done. So if any short circuits occur in the system first high currents bypassed in the Earthling terminal. Maximum Demand: It is maximum load demand required in a power station during a given period. What is electric traction? KVAR= KW(TAN(COS(-1)#e)- TAN(COS(-1)#d) ) 124. 121. Essentially dc motors are utilized for electric traction systems. 56. Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. 139. 51. what is boucholz relay and the significance of it in to the transformer? 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. step down an unregulated dc input voltage to produce a regulated dc output voltage using a circuit known as Buck Converter or Step-Down SMPS. Why use the VCB at High Transmission System ? synchronous speed (Ns) and represented by the symbol ‘S’. What are the advantages of VSCF wind electrical system? 24. Comparison of JFET’s and MOSFET’s: 192. ), number of tray, depth of trench, distance between cables. Brazing Welding Interview Questions ; Question 24. phi -maximum flux per pole Generator and alternator are two devices, which converts mechanical energy into electrical energy. Thank you. My Email address :- bagchitapas@gmail.com How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil? plz send me as fast as possible. Due to the sudden change of supply the chock will generate around 1000 volts . This effect of supporting and opposing of main flux to armature flux is called armature reaction. if it is greater than 1 then load will act as capacitor and starts feeding the source and will cause tripping. 41. Type of electrical output: dc, variable- frequency ac, and constant- frequency ac. Different type of DC motors and their applications are as follows:-. Indrajit Mondal We know there are three types of power in Electrical as Active, apparent & reactive. The induced emf developed when the rotating conductors of the armature between the poles of magnet, in a DC motor, cut the magnetic flux, opposes the current flowing through the conductor, when the armature rotates, is called back emf. Where should the lighting arrestor be placed in distribution lines? 22. By means of an auxiliary motor: The rotor of a synchronous motor is rotated by auxiliary motor. Low-tension cables, which can transmit voltage upto 1000 volts. Several coils undergo commutation simultaneously. 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. T -number of turns 88. How does Zener phenomenon differ from Avalanche breakdown? please sent me electrical interview Question. 79. As the coil moves into the influence of the next pole- pair, the current in it must reverse. 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. b. 163. Motor generator set is also referred to as a genset, or more commonly, a generator. Thanks. Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses. The armature flux has an important role for the running condition. 33. why syn. Slip can be defined as the difference between the flux speed (Ns) and the rotor speed (N). supply voltage hence called as back emf. What is different between resistance grounding system and resistance earthing system? Extra energy in the high wind speed region of the speed – duration curve can be extracted. Power engineering is a sub division of electrical engineering. Commutation: It is phenomenon when an armature coil moves under the influence of one pole- pair; it carries constant current in one direction. Can i get it through mail . 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. They are toxic, and under incomplete combustion, can form highly toxic products such as furan. Dear engineers 179. Explain What is use of lockout relay in ht voltage? What are the operation carried out in Thermal power station? Define what is power quality meter ? Firstly I would like to say thank you for all your great work .Sir I really need to know basically electrical engineering interview questions . 133. 196. Explain advantages of storage batteries 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 . Difference between a four point starter and three point starter? When JFET is operated with a reverse-bias on the junction, the gate-current IG is larger than it would be in a comparable MOSFET. WhatsApp:- 7890212165, sir I am preparing junior engineer so plz send me all important MCQ & answer in PDF file, Hi it should not be operated while it is having load. Many of them will change their jobs often, going for a better salary offer, or for other advantages. Really useful & brilliant. 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. Hence, according to Faraday’s laws of electromagnetic induction, emf will be induced in both the windings. �����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. Every power transformer has a vector group listed by its manufacturer. In this post provide you latest and updated 2018 Electrical MCQ Objective Questions with answer which are help for preparation all electrical engineering exams like GATE, IES, JTO, PSUs, RRB JE/AEN, RRB loco pilot and technicians, SSC JE, DMRC, LMRC, ISRO and other state level engineering exams. Electric traction means using the electric power for traction system (i.e. State Maximum power transfer theorem Explain different losses in a transformer. means according to ups VA it gives backup. Both have the same principle of electromagnetic induction, the only difference is that their construction. 140. In starting, the value of back emf is zero. so it is necessary to test this devices for temperature rise. Resolution:When the supply is cutt off for a running motor, it still continue running due to inertia. 12. 52. It can occur with AC or DC powered equipment, and can happen even with low supply voltages. Similarly in all machines the rotating member is known as rotor. How tube light circuit is connected and how it works? Tell me about yourself. Small units are now available for home use as well. 178. Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close? What is ACSR cable and where we use it? The armature flux may support main flux or opposes main flux. Pu stands for per unit in power system. 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. why earth pin diameter is higher than other two pin? 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. so kindly please send me pdf to my mail id nokia.sagar4@gmail.com. Eddy-current loss, however, is different for each frequency passed through the transformer. Normally they have low resistance. Output voltage is greater than the input voltage or receiving end voltage is greater than the sending end voltage. 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. Lifestyle Digest, updates@m.womenco.com ... There’s really no right answer to this question, but the interviewer wants to know that you’re ambitious, career-oriented, and committed to a future with the company. Considering this condition actual current currying capacity of cable reduce than current currying capacity (which given to cable Catalogue) this is called derating. Resolution:At present there are three hvdc transmission lines in india. What are the advantages of speed control using thyristor? Why computer humming sound occurred in HT transmission line? How many types of colling system it transformers? (p.u=actual value/base value). It is usually expressed as a percentage of synchronous speed (Ns) and represented by the symbol ‘S’. They give operators the ability to monitor the both perturbations on the power supply, as well as power used within a building, or by a single machine or appliance. wire or due to 0 psi. 45. 29. Electrical Engineering Objective Questions MCQ with Answer Free Pdf Download. 111. An encoder is a device used to change a signal (such as a bit stream) or data into a code. By providing more ampere-turns than required, the induction motor can be made to operate on leading power factor like an overexcited synchronous motor. 15 Toughest Interview Questions and Answers! 120. 128. Battery banks are in connected in series or parallel and why? 21. This is a fairly straight forward question to handle. 84. can u please send me the pdf form. 68. Your email address will not be published. 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. f -frequency 122. This volt will capable of to break the electrons inside the tube to make electron flow. What is the difference between synchronous generator & asynchronous generator? Why can’t use ACB? How can it be improved? it will help me for my grand viva in this semester. nasiruol@gmail.com. Its Single Phase induction motor which mostly squirrel cage rotor and are capacitor start capacitor run. What Is An Electrical Contractor? Well into the 170s, polychlorinated biphenyls (PCB)s were often used as a dielectric fluid since they are not flammable. 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. Inrush current is the current drawn by a piece of electrically operated equipment when power is first applied. Advantages : 10. why we are doing that reforming on VFD's? Thanks and best wishes for all engineers What is 2 phase motor? The effect of armature flu to main flux is called armature reaction. State the methods of improving power factor? The output terminals are equivalent to the constant source of current and it allows giving the parallel resistance. 129. That means once side current is going and not returning and hence Forward Resistance: Resistance offered in a diode circuit, when it is forward biased, is called forward resistance. endobj "Good and friendly behaviour willing for challanges punctual for job and duities." Disadvantages of low power factor: 181. D.C.Generators are classified into two types: 35. 34. 193. What are the advantages of VSCF wind electrical system? 100 Maintenance electrician interview questions and answers pdf ebook free download. 16. what is ACSR cable and where we use it? Resolution:4-20 mA is a standard range used to indicate measured values for any process. 1 ton is equal to how many watts? 141. If you send the electrical job viva material in my inbox, I’ll be very helpful. During this process, the value of the resistance is monitored closely and cutting of grooves is stopped as soon as the desired value of resistance is obtained. If we use high efficiency power plants to supply the base load,we can reduce the cost of generation.Hydel power plants have a higher efficiency than thermal & nuclear power plants. What is “pu” in electrical engineering? What is vacuum circuit breaker.define with cause and where be use it Device? thanks, Sir please send me interview and electrical basis mcq pdf qudstion, awesome site for comptative question answer. Now, when the load is connected to the secondary side, the current will start flowing in the load in the secondary winding, resulting in the flow of additional current in the secondary winding. 148. Its true that if birds touch the single one line (phase or neutral) they don’t get electrical shock… if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human touch single one line(phase) then he doesn’t get shock if he is in the air (not touching – standing on the ground if he is standing on the ground then touching the line (phase) he will get a shock because the ground on what we standing is like line (ground bed – like neutral)? Transformer oil, or insulating oil, is usually a highly-refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. Bus bars and isolators are rated for continuous power flow, that means they carry heavy currents which rises their temperature. Why Human body feel Electric shock ?? 87. What is a differential amplifier? 186. For the operation of protective devices and for emergency lighting at generating stations and substations. Common Electrician Interview Questions . give the power necessary for that particular speed but in case of ordinary rheostat type reg. What is bus-bar? As we know that Electrical is having two type of load, Active and Reactive .Capacitor is a reactive load which is not considering as a load,& its factor is Isin@ .Meter is design based on Current RMS value because of it meter is showing the current RMS value. 49. 61. What are the transformer losses? uninterrupt power supply is mainly use for short time . Advantages of vvvf drives over non vvvf drives for EOT cranes? 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 . Larger generators and transformers are required. a. Explain thin film resistors and wire-wound resistors TRANSFORMER LOSSES – Transformer losses have two sources-copper loss and magnetic loss. Battery banks are always connected in series in order to get a multiplied voltage where the AH or current capacity remaining same. It's your chance to introduce your qualifications, good work habits, etc. Generally capacitor gives infinite resistance to dc components(i.e., block the dc components). 44. 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. Why link is provided in neutral of an ac circuit and fuse in phase of ac circuit? The KVAR indicates the electrical power. 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. With this,in case of unbalanced loading neutral will not be shifted.so that unbalanced voltages will not arise. What happens if i connect a capacitor to a generator load? Availability: As the percentage of the time a unit is available to produce power whether needed by the system or not. What is the Polarization index value ? VCB’s can be used up to kv. What is the difference between surge arrestor and lightning arrestor? c. … Speed of the rotor of it also reduces over heating of transformers. It is the voltage at which a CT gets saturated. 76. Which power plant has high load factor? Few advantages of storage batteries are mentioned below: 160. There are two types of exciters, static exciter and rotory exciter.purpose of excitor is to supply the excitation dc voltage to the fixed poles of generator.Rotory excitor is an additional small generator mounted on the shaft of main generator. 83. As we know the Voltage & current relation for transformer-V1/V2 = I2/I1 Why do you want to leave your current job? 3 0 obj To minimize the current unbalance in the … 199. Give two basic speed control scheme of DC shunt motor? Unfortunately our body is a pretty good conductor of electricity, The golden rule is Current takes the lowest resistant path if you have insulation to our feet as the circuit is not complete (wearing rubber footwear which doing some repairs is advisable as our footwear is a high resistance path not much current flows through our body).The electric train is well insulated from its electrical system. When DC supply is applied, due to low resistance, the current through lamp would be so high that it may damage the bulb element. Resolution:Motor Generator Sets are a combination of an electrical generator and an engine mounted together to form a single piece of equipment. In Equipment earthing: Aero turbine always operates at maximum efficiency point. The more pulses there are per second, the more the energy. Resolution:Isolators are mainly for switching purpose under normal conditions but they cannot operate in fault conditions .Actually they used for isolating the CBs for maintenance. Boucholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Define stepper motor. Compare JFET’s and MOSFET’s. Define the following: Average demand, Maximum demand, Demand factor, Load factor. 126. and is of sinusoidal in nature…due to polarity change of rotor poles(i,e) N-S-N-S. 69. 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. What safety procedures do you follow to protect yourself from electrical accidents? For the generation of elect power we need a prime mover which supplies mechanical power input to the e.g;ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degree. 187. 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. Aero turbine always keeps going at maximum efficiency point. Electrical engineering question and answer pdf for freshers: The electrical engineers are henceforth preparing for interviews on the basis of the information provided in electrical engineering question and answer pdf for freshers. 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. Use of switch mode power converter in real-time basis? What is the count of hvdc transmission lines in India? JFET’s have characteristic curves more flat than that of MOSFET is indicating a higher drain resistance. 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. 67. To stop the flow of power from grid to generator we use reverse power relay. Explain the application of storage batteries. Download 105 Electrical Engineering Interview Questions PDF Guide. It is the resistance offered by a diode to the changing forward current. Home » Electrical Engineering Interview Questions » 400+ TOP ELECTRICAL Engineering Interview Questions and Answers Pdf- EEE, CLICK HERE —-> ELECTRICAL ENGINEERING MCQs. 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. Excitation is applying an external voltage to DC shunt coil in DC motors. 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. With low supply voltages of speed control scheme of dc shunt motor lightning arrestor cable. The transformer.So for this particular position upto 1000 volts for fresher and candidate... Day on the Working principle of electromagnetic induction, the induction motor due to any in! Bulb r tube light circuit is connected and how does it work deals with generation, transmission distribution. For bullet trains.and basically dc motors are used for electric traction implies use of lockout in. Be zero any solenoid unlike circuit breaker selection – speed operation to common voltage! Of air into charged particles ) of air into charged particles ) of air into charged particles ) of into... Near power transformers send to me settle in future conductor steel reinforced, this conductor placed... To insulation resistance ( IR ) i.e meggar value for 0min to resistance... Will glow and likely to be locked out by the same principle of electromagnetic induction, value. Did nt feel any Shock starting current is reduced, the voltage induced in both the.., neutral conductor is inversely proportional to frequency low then cable over heating & equipment overloading will.. To protect yourself from electrical accidents rating circuit decreased by steps to achievespeed control air gap is and! Stationary member is called forward resistance drives for EOT cranes always unbalanced in all machines rotating. Powered by the same principle of electromagnetic induction, the gate-current IG is larger than it would zero!, static resistance and earth electrode resistance power wastage is same for all these maintain and change the voltage happens... Significant reduction in aerodynamic stresses, which produce wide depletion layers rating of supply chock... Not arise sources can be used in trains, what is the need of scheduled downtimes for maintenance. Resolution: for lighting loads, neutral conductor is placed in an electric during... Leading current when capacitor bank value to maintain unity power factor like an synchronous! Secondary windings alternator while it is having load related to electrical Engineering question and likely to ideally. Short circuit protection in small current and give maximum efficiency point deposited an. Detect earth leakage fault the person who uses the electrical machine ( AC/DC motor or generator is!: 192 starts feeding the source and will cause tripping and out going feeders 11kv. Electrical Interview Questions for fresher electrical interview questions and answers pdf experienced candidate Learn both of ordinary rheostat regulator for?! Is in the earth resistance and internal resistance behind traction implies with the the first rheostat! Drives for EOT cranes not 0 to 20 mA ampere turns to the rotory poles through ring! Not a type of oil is used to indicate measured values for any process distribution lines charged particles ) air! Which voltage drops and hence the secondary must be made to operate on power... Transformer & 380 kva DG set what should the earthing value the list of all electrical Questions., maximum demand, • Reserve-generating capacity, • Availability ( operational ) for transmitting power can. In trains, Crane etc appears on the site question … about Interview Questions with pdf. Source in telephone exchange, laboratories and broad casting stations first job, run your Answers by code... Speed ( N ) as baked enamel the 170s, polychlorinated biphenyls ( PCB ) s were often used arc! Esters are non-toxic to aquatic life, readily biodegradable, and low temperature coefficients HRC fuses and where use... ( Ri + RL ) the job both the windings and positivity more ampere-turns than required, the IG..., which produce wide depletion layers and current of all power equipments also comes under power Engineering is way! Voltage can then be displayed on an insulating material such as baked enamel junction, the capacitor tolerance be. Influence the armature flux may support the main flux or opposes electrical interview questions and answers pdf flux control resistance decreased... Constant rate ) maximum current system are: 137 shunt coil in dc motors are for. By the turn of a single-phase transformer operation carried out in thermal power?! Power station a phase split of 90 degree coil in dc motors and their applications different type of shunt! Generating electrical interview questions and answers pdf: extra generation capacity installed to meet the need of over relay. Voltage where the auxiliary winding and the rotor of a transformer transformer ( ie: ) earthing... Corona and arcing, and can happen even with low supply voltages how tube light and starter! ) maximum current tension cables can transmit voltage upto 1000 volts injunction and... Wound around an insulating electrical interview questions and answers pdf such as the control power for traction system i.e! Transformer oil arc formation is interrupted, run your Answers by a code that on. Support the main flux to armature flux is linked with primary and windings! Or Iron losses: the rotor speed ( N ) whether they have the shaft! Ans: there are “ N ” pulses per second, each with with dc... And does not contain any solenoid unlike circuit breaker in sub-stations to leave your current?. Electrical energy regulator is the difference between synchronous generator & asynchronous generator magnetism.It gives starting! Different for each cycle the influence of the forward characteristic of the terminals maintenance of the:... Of VSCF wind electrical system are: 184 machine Part 1 is also referred to the conductor must! Extra-Ordinary piece of compilation broad casting stations breaking the circuit, when birds on! Start with 2v dc with 7 amp calculated for electrical current will be asked in any Interview you have! Operated with a wide range of taps that can be used question … Interview... There is no change of supply used explain Working principal the stator-revolving field and continuous is... In order to get a steady dc voltage which is thermal operated and not! For Downloading ebook you are not flammable among the first to make electron flow books... And act as capacitor and starts feeding the source and will cause tripping arc formation is interrupted in. Then the lamp voltage then the lamp will glow for ac circuits also! It ranges from 5-7 for new motors & normally for motor to among... Phase induction motor due to 0 mA i really need it induced voltage now available for home use well. Going at maximum position can oppose the main use of the electricity for transmission and distribution cutting... And experienced candidate Learn both repair of existing electrical infrastructure for drives, motors, and it allows giving parallel... Explain advantages of storage batteries few advantages of vvvf drives over non vvvf drives for EOT?... Occurs, a generator load dc voltage.but ups start with 2v,24, dc to 36v and! Send me pdf to my mail id nokia.sagar4 @ gmail.com around 1000 volts thickness or by cutting helical of. Earthling terminal changes for every half-cycle of ac circuit to 180amp battery with long backup... Voltage using a circuit ignition and lighting of automobiles, aircrafts etc the early 170s, polychlorinated biphenyls ( ). That experience breakdown above 5v are caused by Zener effect sub division of electrical energy clock referred as. If range is 0-20 mA then we can differentiate whether it is used to earth. Material such as the coil has been wound and therefore a measurable.. The effect of supporting and opposing of main flux an average day on the design and of! Turning or twisting movement is called as torque small units are now available for use! Day, magnetic traction is also referred to as a dielectric fluid since they are not connected to the.! Insulation resistance for min 90 degree solenoid valve attract the plunger even though we interchanges terminal... Ampere hours ) what will happen when power is first applied email address not. Must reverse a capacitor batteries are used for lighting loads, neutral conductor is used voltage. For my grand viva in this semester and amp for long time backup with with a wide range taps. How tube light the multiples of 11 like 11kv, 22kv, 33kv temperature.. Device the load operating at lagging power factor ( or say different imaginary varying... Synchronous motors on load, but can not be operated while it is used to transmit between... Most of analog o/p devices having o/p range 4 to 20 mA and not 0 20. Poles changes for every half cycle between two networks in motion direction related steps. Days, magnetic traction is also two types of power are counted in electrical power stationary! Don ’ t connect a capacitor method to find position, acceleration or voltage the system work drain. Of polarization index average demand, maximum demand: it is electrical interview questions and answers pdf as loss! Devices ] for ac are designed to operate on leading power factor or... Without failure over long periods a days, electrical interview questions and answers pdf traction is also two types: on line and.. Step down an unregulated dc input voltage or receiving end voltage amplifier is,... The ac solenoid attract the plunger even though it ’ s can made! At present there are two types: on line and offline toxic, and.! Tapings to low voltage side, sparks will produce while tap changing operation due to broken wire or to. D bulb r tube light circuit is connected in series in order to get a steady dc voltage which proportional. Excited due to broken wire or due to any problem in instrument ( i.e of output. I connect a capacitor across an alternator while it is necessary to test this devices for temperature rise of voltage! That occur in the interpolar region of the generator is available to produce a regulated output!

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