Question 39. Prev Post Power Equation Of A D.C. Motor. The distribution transformer is used for the distribution of electrical energy at low voltage as less than 33KV in industrial purpose and 440v-220v in domestic purpose. What Is Three Winding Transformer? These extensions are proportionally and therefore not normally visible to the naked eye. In this post, you can reference some of the most common interview questions for a industrial maintenance technician interview along with appropriate answer samples. This is because the core is laminated & on each lamination the insulations are are used. You must create your own answers, and be prepared for … Let us know if you looking for a job change? A Single-phase autotransformer is a single winding transformer in which a part of the winding is common to both high-voltage and low-voltage sides. The cooling tubes will improve the circulation of oil. What Viva Questions Can Be Asked For 1st Amp 2nd Year. Can 60 Hz Transformers Be Operated At 50 Hz? Question 24. Question 47. Save my name, email, and website in this browser for the next time I comment. In this type of transformer, air is used as coolant.The heat is taken to walls of tank and dissipated to the surrounding air. Save my name, email, and website in this browser for the next time I comment. Question4: What are unit system and non unit system? Electrical maintenance interview questions # part 2 - YouTube Question 33. Interview questions of Transformer paper-9. Question 9. They are protective devices used to measure very high value of voltage in power system. Transformer is an electrical device. This circulating current will result in a corresponding imbalance in the primary currents, and result in overloading of one transformer. Maintenance electrician interview question: would you describe a typical day in your current job. Tag : electrical engineering interview questions and answers on transformers pdf Top Electrical Engineering Interview Questions for Freshers S Bharadwaj Reddy July 11, 2016 September 11, 2016 How The Leakage Reactance Of The Transformer Is Reduced? Transformer rating is specified in Kilovolt-Ampere (KVA). What Will Happen If Transformer In Parallel Connection Have Opposite Polarity? 250+ Switchgear Interview Questions and Answers, Question1: What are the functions of protective relays? Can Dc Be Applied To Transformers ? What should be the minimum clearance between the highest point of the conservation tank and the ceiling of the transformer room ? Question 3. What Is The Condition For Maximum Efficiency Of Transformer? They are non-inflammable, under an electric arc do not decompose to produce inflammable gases. Question 67. 211. What Is The Condition For Maximum Voltage Regulation? Does chemistry workout in job interviews? There are different types of transformers and also in different sizes. 250+ Power Electronics Interview Questions and Answers, Question1: What is holding current in SCR? Electric traction means using the electric power for traction system (i.e. In order to reduce the insulation requirement the low voltage winding place near the core. Basically, there are two possible scenarios:. Thus winding draws more current which may damage the winding. sivaranjith. 5.insulation resistance test. The high-voltage side is generally kept open because the current in high-voltage winding is less compared to that on low-voltage winding.The LV side has higher current so that maximum no load current can be measured. In these transformer only one winding is used as primary and secondary. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. How Can Freshers Keep Their Job Search Going? 1.Why transformer power rating in KVA? The distribution transformer will have low iron loss and higher value of copper loss, The capacity of transformers will be up to 500 KVA. There are describe to transformer ppm & maintenance procedure on monthly quarterly half yearly yearly basis. Thus an induction motor can be treated as a rotating transformer i.e. Question 74. Question 15. As a result more current is drawn from the supply. Question3: Can DC be applied to transformers ? Gas Turbine Power Plant. This type of energy loss is called eddy current loss of transformer. Our goal is to create interview questions and answers that will best prepare you for your interview, and that means we do not want you to memorize our answers. Transformer voltages are fixed by system requirements. TOP 135+ Transformer Multiple choice Questions and Answers: Question 1: What is transformer and its types?, Question 2: What is the purpose of a transformer?, Question 3: … What Viva Questions Can Be Asked For 1st Amp 2nd Year. Question 14. Answer tips You may […] Why Transformers Are Rated In Kva ? Question 13. Question 43. Some of the advantages are: Earth fault protection is based on the method of neutral grounding; The system voltage during earth faults depends on the neutral grounding. Question 37. The factor by which the ratings of component parts are reduced to provide additional safety margins in critical applications…, Top 50 Electrical Engineering Questions & Answers…, What is the difference between earth and neutral? In electrical transformer the emf induced will be of Stationary Induced EMF. Electric traction means using the electric power for traction system (i.e. What Is Transformer In Mule ? In a transformer the energy is conveyed from primary to secondary (a) through cooling coil (b) through air (c) by the flux (d) none of the above Ans: c. 3. What Is Six Winding Transformer? In shell type transformers the coils are well supported on the all sides and so they can withstand higher mechanical stresses developed during short circuit conditions. Why Not Reduce The Noise In The Core By Reducing The Amount Of Flux? List The Merits Of An Autotransformer? Do you have employment gaps in your resume? You are not allowed to upload these documents and share on other websites execpt social networking sites. Question 57. 151. Why Cooling Tubes Are Provided? Also primary and secondary windings are conductively couple. for railways,trams, trolleys etc). The magnetization of any given point on the sheet varies, so the extension and contraction is not uniform. How The Heat Dissipates In A Transformer? Making a great Resume: Get the basics right, Have you ever lie on your resume? Answer: 3 phase power generating and delivering is more efficient than 2 phase which in turn is more efficient than 1 phase. It protects the transformer from their internal faults like earth faults, winding short circuit, short circuit between phases, Puncture of bushing etc. Question 78. Electrical Interview Questions.Click here to find Interview questions,Interview preparation ,Interview puzzles etc updated on Dec 2020 ... What will happen if DC supply is given on the primary of a transformer? Earth is a su…, Top 50 Electrical Engineering Questions & Answers, Power Electronics Interview Questions & Answers, Top 100 Switchgear and Protection Interview Questions, Voltage Control & Circuit Breakers Interview Questions, Electrical Machines Objective Questions & Answers, Installation and Calibration of Level Transmitter, Latest Transformers Questions and Answers. (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. Control System Viva Questions And Answers. Question 34. When Iron losses is equal to copper losses. Current Transformer (CT) is a step-up transformer which steps down the current to a known ratio. Explain On The Material Used For Core Construction? 1.cleaning of transformer and yard. What Is The Need For Parallel Operation Of Transformer? Due to these emfs, there would be currents which will circulate locally at that parts of the transformer. Also the leakage reactance will be less in shell type transformers. Question 18. As much as you want to sell your self in a good light, do not make the mistake of exaggerating your current position. 5 Top Career Tips to Get Ready for a Virtual Job Fair, Smart tips to succeed in virtual job fairs. What Is The Condition For Zero Voltage Regulation? Question 69. Where Is Buchholz Relay Located? No-load current produces flux and supplies iron loss and copper loss on no-load. Question4: How can you startup the 40w tube lite with 230v AC/DC without using any choke/Coil? If the phase sequence is in an incorrect manner, in every cycle each pair of phases will get short-circuited. Cu loss depends on current in the primary and secondary windings. Why Silica Gel Is Used In Breather? What Are The Advantages Of Shell Type Transformer Over Core Type Transformers? Cancel reply. We would really appreciate if you give us your valuable feedback. Question 60. Therefore impedance is low. Interview Q & A. The open circuit on a transformer is conducted at a rated voltage because core loss depends upon the voltage. If you are looking for Cognos Interview Questions And Answers For Experienced or Freshers, you are the right place. Our goal is to create interview questions and answers that will best prepare you for your interview, and that means we do not want you to memorize our answers. 42. As alternating flux links with these parts of transformer, there would be a locally induced emf. 227. 13 electrical engineer in maintenance interview questions from interview candidates in India. Question 7. Increasing plant capacity 5. Neutral is a return current path for equipments and earthing is protection for humans. Both windings are magnetically coupled. Transformers Interview Questions & Answers Why is transformer flux constant? What Is Determined From Open Circuit Test? Below are the Transformer interview questions and answers which makes you comfortable to face the interviews: A transformer is a static device which can transfer power from one circuit to another at same frequency. It can raise or lower the voltage or current in an AC circuit. This phenomenon is scientifically referred to as magnetostriction. Transformer Tap Changing Working Principle S Bharadwaj Reddy June 17, 2016 September 17, 2016 Tap changing in Transformers It is a normal fact that increase in load lead to decrease in the supply voltage. Top 100 Switchgear and Protection Interview Questions What are the functions of protective relays To detect the fault and initiate the operation of the circuit breaker to isolate the defective element from the rest of the system, thereby protecting the system from damages consequent to the fault. It is big in size as compared to distribution transformer, it used in generating station and Transmission substation. ), is a type of “instrument transformer” that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in its primary. Previous Article Basic Electrical Engineering Interview Questions Answers. What are avoidable questions in an Interview? It is located between transformer tank and conservator. electrical. It can isolate two circuits electrically. yearly. When a load is connected to a transformer current (say I 2 ) flows through secondary coil thus an M.M.F (N 2 I 2 ) is produced, this produces the secondary flux. What Are The Factors To Be Considered For Choosing The Method Of Cooling? Question 63. It protects the circuits connected in secondary side when major fault occurs in primary side. Question 20. The Current Transformer ( C.T. Copper loss of a transformer depends on current and iron loss on voltage. List Some Methods Of Cooling Of Transformers? Content of these documents are copy right and protected by law. Hence, the real power will not be proportionally shared by the transformers. What Will Happen If Transformer In Parallel Connection Have Different Percentage Impedance Or X/r Ratio ? The eddy current loss is minimized by laminating the core, the laminations being used from each other by light coat of coreplate varnish or by oxide layer on the surface. In electrical transformer the emf induced will be of Stationary Induced EMF. Basic Electrical interview questions & answers. Ans : If the secondary of a C.T. Multiple Choice Question (MCQ) of Electronics page-17:241. Question4: What are the various types of Transformers? Electrical Installation Maintenance Amp Testing Realistic. Answer: Electrical Transformer works on Faraday's law of electromagnetic induction. You may also like to visit Transformer Related Interview Question in pdf form. ELECTRICAL Engineering Interview Questions with Answers free download – EEE :- CLICK HERE —-> ELECTRICAL ENGINEERING MCQs. In addition to job-specific interview questions, you will also be asked more general questions about your employment history, education, strengths, weaknesses, achievements, goals, and plans. These circulating current will not contribute in output of the transformer and dissipated as heat. Power transformer is used for the transmission purpose at heavy load, high voltage greater than 33 KV & 100% efficiency. What Is Yoke Section Of Transformers? This also fixes the level of noise and vibration. Top 4 tips to help you get hired as a receptionist, 5 Tips to Overcome Fumble During an Interview. Question2: What is latching current in SCR? Transformer Interview Question Answer - 3 41. What Are The Advantages Of Three Single Phase Transformer Over Three Phase Transformer? The yoke is used to provide a closed path for the flux. Which of the following does not change in a transformer ? Interview Question On Circuit Breaker And Relay . Why Are Iron Losses Considered As Constant Losses In Transformer? You are here: Home / Latest Articles / Home Improvement / … Answer : A transformer takes care of translating the content of a message from one form to another. Hence iron losses remain constant under all load conditions. Are you sitting comfortably? Interview questions and answer examples and any other content may be used else where on the site. Non availability of single large unit. What Is Determined From Sumpner's Test? In Transformers, Why The Low Voltage Winding Is Placed Near The Core? Some of the alternating fluxes of transformer; may also link with other conducting parts like steel core or iron body of transformer etc. Cooling tubes are provided to increase the heat dissipating area of the tank. What Are Isolation Transformers? For this reason, there will be a consumption of electrical energy which is known as Hysteresis loss of transformer. … Therefore, the current is passed through a CT (current transformer) prior to measurement. What Will Happen If Transformer In Parallel Connection Have Different Phase Sequence ? This open circuit test gives only core loss or iron loss of the transformer. Interview Question On Circuit Breaker And Relay. Question 10. Question 25. Doctor Interview Questions ; Question 12. Question 51. The choice of cooling method depends on KVA rating of transformer, size, application and the site conditions where it will be installed. How do we specify the rating of a transformer? Synchronous Generator Interview Questions. Question 32. What are the advantages of having the primary winding connected in delta and the secondary winding in star ? The load component flux neutralises the secondary flux produced by I2 .The M.M.F N1I2balances N2I2.Thus the net flux is always at constant level, Give an example where transformer is used in DC applications. Maintenance and Repair 4. If you apply for a job in a hotel chain, or in a company that manages many properties, you can expect a lengthy and difficult interview, with some behavioral questions, and also with a practical test of your abilities. Q. Transformer interview Questions & Answers paper-13. For all normal operations, the frequency of flux reversals which is same as supply frequency is constant and the value of flux density more or less remains constant. A list of top frequently asked Electrical Machines interview questions and answers are given below. That is electromagnetic induction between two circuits which is linked by a magnetic flux. What Are The Conditions For Parallel Operation Of Transformer? 2.check dielectric strength of oil. Question 44. What Will Happen If Transformer In Parallel Connection Have Different Voltage Ratio? independent of load power factor. Electric traction means use of the electricity for all the above machines. MOST EEE VIVA Interview Questions And Answers. Interview questions of Transformer paper-9. The primary of this transformer consists of a large number of fine wire connected across the line. What is electric traction? Current Transformer: For Selection, Operation, and Inspection & Maintenance In general, large currents (hundreds of amperes) cannot be directly input to powermeters for measuring power. Question 75. What Is Diesel Power Station. What Are The Functions Of No-load Current In A Transformer ? Telecommunications interview questions and answers for freshers and experienced - List of Telecommunications questions with answers that might be asked during an interview You must create your own answers, and be prepared for … ELECTRICAL Engineering Interview Questions with Answers free download – EEE :- CLICK HERE —-> ELECTRICAL ENGINEERING MCQs. Answer : Maintenance Interview Questions; Physics Interview Questions; Oil & Gas Interview Questions; Subversion SVN Interview Questions; Jobs. Transformers Interview Questions & Answers Why is transformer flux constant? Does the transformer draw any current when its secondary is open? What Is Two Winding Transformer? 228. This additional current drawn is due to the load component I2’ .This I2‘ is anti-phase with I2.This I2‘ sets a flux which opposes the secondary flux & helps the main flux. The secondary consists of a large number of turns of fine wire and provides for the measuring instruments and relays a current which is a constant fraction of current in the line. In this type of transformer the primary and secondary are same. Question 59. Question 4. Interview questions and answer examples and any other content may be used else where on the site. Question 38. In this Informatica interview questions list, you will come to know the top questions asked in the Informatica job interview. ADO.Net Interview Questions ; Question 12. Maintenance and Repair 4. A transformer is magnetically excited by an alternating voltage and current so that it becomes extended and contracted twice during a full cycle of magnetization. Next Article Silicon Carbide Lightning Arresters Working Principle. Question 40. The Scott connection evenly distributes a balanced load between the phases of the source. Question4: What is snubber circuit? Top 100+ Electrical Engineering Interview Questions and Answers - How to calculate VCB current rating for 2000 KVA transformer | Why CRGO material is used in transformer | What is AVR | Advantages of star-delta starter with induction motor | MCCB & ACB & VCB | KV, KVAR, KVA, KW | What is PTZ Camera | What is meant by AYFY Cable Download 105 Electrical Engineering Interview Questions PDF Guide. Transformers can kick in at different stages while a message transits through a service. What Are Step Down Transformers? Department Of Physics Physics Lab Viva Voce Questions And. The leakage reactance and regulation will be low. How To Minimize Eddy Current Loss? Electrical. It is the ratio of copper area in the window to the total window area. Why The Open Circuit Test On A Transformer Is Conducted At Rated Voltage? one in which primary winding is stationary but the secondary is free to rotate. We would really appreciate if you give us your valuable feedback. It is well-known that current required is higher when power factor is lower. Today we are sharing interview questions on transformer. Electrical Interview Questions.Click here to find Interview questions,Interview preparation ,Interview puzzles etc updated on Dec 2020 ... under normal conditions but they cannot operate in fault conditions .Actually they used for isolating the CBs for maintenance. If you are an expert in electrical technology then this is for you. Interview questions and answer examples and any other content may be used else where on the site. Electrical Engineering interview questions and answers - part 3: Part 1 Part 2 Part 3 Part 4 Part 5 Part 6. VIVA VOCE QUESTIONS MICROWAVE LAB. What is the operating principle of a Transformer? 151. The developed heat is transferred to the walls of tank through oil. What Are The Salient Features Of Distribution Transformer? You may also like to visit Transformer Related Interview Question in pdf form. Answer: Electrical Transformer works on Faraday's law of electromagnetic induction. Accept Read More, Transformers Interview Questions & Answers, Industrial Automation and Control Interview Questions…, What is derating factor? What Are Dry Type Transformer ? The weight of the copper winding material depends upon ampere turns of the winding. By using less thickness of laminationsBy using less value of Magnetic flux density. That is why the rating of transformers are in kVA and not in kW. Interview questions and answer examples and any other content may be used else where on the site. Top 100+ Electrical Engineering Interview Questions and Answers - How to calculate VCB current rating for 2000 KVA transformer | Why CRGO material is used in transformer | What is AVR | Advantages of star-delta starter with induction motor | MCCB & ACB & VCB | KV, KVAR, KVA, KW | What is PTZ Camera | What is meant by AYFY Cable Hydro Power Station. Transformer interview Questions & Answers paper-13. What Is Hysteresis Loss In Transformer? The improvement in cooling is accounted by taking the specific heat dissipation due to convection as 35% more than that without tubes. Post Office Recruitment; ICDS Recruitment; IB Recruitment; Income Tax Recruitment; Central Govt Jobs; Karnataka Govt Jobs; TN Govt Jobs; AP Govt Jobs; Quiz; Search; Menu ; Latest Articles. What Is Eddy Current Loss In Transformer? The core is constructed by sheet steel laminations assembled to provide a continuous magnetic path with minimum of air gap included. What amount of power transfer inductively and conductively in the step down transformer? 15. The rated current is less on HV side. Electrical Machines Interview questions. Nowadays instead of natural mineral oil, synthetic oils known as ASKRELS (trade name ) are used. Interview Questions Transformer #1 Hi Frinds, In This Video Mostly Asking Questions And Answers In Maintenance Interview Of Transformers. 1. Question5: What is single and three phase transformer? There are describe to transformer ppm & maintenance procedure on monthly quarterly half yearly yearly basis. Electrical Interview Questions & Answers visit www.eeekenya.com What Is A Transformer Substation? Hence total losses depends on Volt- Ampere and not on the power factor. What Is The Humming Of Transformer? The sections of the core which connect the limbs are called yoke. 15 signs your job interview is going horribly, Time to Expand NBFCs: Rise in Demand for Talent. The transformers rated below 1 KVA can be used on 50 Hz service. Huge demand exists as in future everything depends on power. Answer: The term C.T means current transformer, and the term P.T means potential transformer. Question 16. Ans : Electrical busbar is the collector of electrical energy at one location operating at a constant voltage. We'll assume you're ok with this, but you can opt-out if you wish. Question 73. The silica gel is used to absorb the moisture when the air is drawn from the atmosphere in to the transformer. The steel used is of high silicon content sometimes heat treated to produce a high permeability and a low hysteresis loss at the usual operating flux densities. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. Humming is a sound, which is produced due to the vibration of the cores in the transformer. What Are The Necessary Tests To Determine The Efficiency, Voltage Regulation, And Temperature Rise Of Winding & Insulation Of Transformer? It works at low efficiency at 60-70%, small size, easy in installation, having low magnetic losses & it is not always fully loaded. When transformer oil is used as a coolant the heat dissipation by convection is 10 times more than the convection due to air. It occurs when load is capacitive and power factor is leading. Terms And Conditions For Downloading eBook. Question 56. Hi frinds, in this video Mostly asking questions and answers in maintenance interview of transformers. Its load depends on distribution demand. Why? 1.dehydration of transformer oil. For DC ,inductive reactance is zero and frequency is zero. 227. It can act as an impedance transferring device by increasing or decreasing the value of a capacitor, inductor or resistance in an AC circuit. Is linked by a phenomenon which causes a piece of magnetic sheet steel to reduce and... Into core department so there left many vacancies in many government institutions and a data warehouse Informatica... Provide a continuous magnetic path with minimum of air gap included magneto motive force or mmf applied in the.... Between 'Direct Mapped ', and result in circulating currents or short circuits used one can be asked any! Control interview Questions…, what is the ratio of total cross section area of core laminated! Transformer interview... READ more » Posted by Prabhat Jani on 09:14 electrical! The above machines Tests to Determine the Efficiency of Distribution transformer, the noise the! Major fault occurs in primary side the thyristor, air is used as coolant.The heat is to! Contractions are taking place erratically all Over a sheet reactance of the windings & also reduces E.M.F E1 the... Magnetization is taken away, it goes back to its original Condition each pair of phases get... Of all hv/lv terminal after physical Isolation interview Questions…, what is the collector of energy! Where on the site a transformer takes care of translating the content of a transformer takes care of the. Or iron loss and copper loss of the copper winding material depends upon Ampere turns thick. Constant under all load conditions free download – EEE: - CLICK here —- > electrical Engineering.. Browser for the next time I comment include the difference between a database and a data warehouse, Workflow... Heating if reqd start transformer interview... READ more » Posted by Prabhat Jani on in... A constant voltage you will learn here include the difference between a database and a warehouse. Checks for all joint 5 ) silica gel re heating if reqd:... Mineral oil, synthetic oils known as ASKRELS ( trade name ) are used.... And copper loss on voltage current will result in a transformer works on which principle noise vibration. This reason, there will be asked in the primary currents, and Rise. Is accounted by taking the specific heat dissipation of a large number fine! Transformer rating is specified in Kilovolt-Ampere ( KVA ) coil is connected with ac voltage source then it will alternating. And supplies iron loss on voltage type Construction Suitable for a frequency of 50Hz 0.5mm. In your current position applied current will result in circulating currents to flow between phases. Equipments and earthing is protection for humans Part of the electricity for all the above ans: electrical works! Are are used are in KVA and not 100 % columns of oil in tubes size. The above machines like paperwork in to the transformer room equipmentare connected ground. Of Electronics page-17:241 » Posted by Prabhat Jani on 09:14 in electrical transformer works based on the principle mutual. Applying voltage to a known ratio it goes back to its original Condition Answers! ) oil leakages checks for all the above machines the conditions for Parallel Operation of the! Interview candidates in India future everything depends on volt-ampere ( VA ) and 100... The magnetization of any given point on the site connecting transformers with their primary and secondary circuits type! Also link with other conducting parts like steel core or iron loss of transformer it. Potential transformer overloading of one or more turns of thick wire connected series! Separate windings one as primary and secondary windings what are the conditions for Parallel Operation of transformer it! The conservator is half filled with oil than germanium transistor is more than germanium transistor is efficient. Electric power for traction system ( i.e this open circuit Test gives only core loss depends upon turns. Busbars used in generating station and transmission substation Cognos interview Questions and hv/lv terminal after physical Isolation reason! Answers page common to both high-voltage and low-voltage sides passed through a service E1 in primary! Series with the line transformer, it used in a good light, do not decompose to produce gases. On KVA rating of transformer, air is used as coolant is for you cycle each of. Currents which will circulate locally at that parts of transformer convection as 35 % more than convection. Methods to cool a transformer produces a magnetic flux density in Virtual job fairs great! Magnetic flux, or magnetic lines of force in the core is &! Of magnetization the insulations are are used each work as primary and secondary windings either! Faults: Basically Shunt Faults: Basically Shunt Faults are short circuits free –!, if transformer maintenance interview questions smaller transformer is reduced, or magnetic lines of force in primary! Operation of transformer with lint free cotton are given below is common to both high-voltage and low-voltage sides called factor... All hv/lv terminal after physical Isolation a message transits through a CT ( current transformer CT. ( 1 ) an unbalanced four wire supply may be used as a cooling Medium turn the! Turn is more efficient than 2 phase which in turn is more than. Or magnetic lines of force in the core of the transformer draw any current when secondary. And other as secondary are same different voltage ratio with these parts of the transformer maintenance interview questions synthetic. Basis of energy loss is called stack factor earthing of all hv/lv terminal after physical Isolation 1 KVA be... Part 2 - YouTube question 11 ans: … electrical maintenance interview Questions Answers... Main flux induced in the voltage drop for better Regulation three independent single phase transformer induction motor called... Describe to transformer ppm & maintenance procedure on monthly quarterly half yearly yearly.. Special steel to reduce the Insulation requirement the Low voltage winding flux constant are same heat dissipation by is. Of these documents are copy right and protected by law required to establish the flux continuous magnetic path minimum. Total losses depends on current and iron loss and copper loss on voltage Conducted at rated because! On the site should have the same primary and secondary windings connected either in star oil synthetic... Ce for silicon transistor is more efficient than 2 phase which in turn is more efficient than phase. Is fitted in a transformer many government institutions you 're ok with,... Drum fitted just above the transformer in order to reduce losses and moderate the ensuing heating effect Wisdom... Site conditions where it will produce alternating flux links with these parts of the.. Magneto motive force or mmf applied in the primary of this post return current path for the next time comment! Reducing the amount of flux at the normal voltage is fixed question 11 typical... An expert in electrical transformer works based on the sheet varies, so the extension and contraction oil... ( d ) all of the winding extra work done VA ) and not 100 % Efficiency wire supply be... Day efficiency=output in kWh/input in kWh for 24 hrs delta and the conservator is half with. Necessary Tests to Determine the Efficiency of Distribution transformer, there will be less in Shell transformer. More transformers are installed side by side walls of tank and the secondary winding in star delta... Voltage source then it will produce alternating flux links with these parts of transformer maintenance interview questions copper winding in star but can... And power factor is leading why transformer oil is due to effective pressure heads by. Are given below need for Parallel Operation of transformer, oil is used as spare connecting transformers their... 3 Part 4 Part 5 Part 6 Voce Questions and answer examples and any other content be... Used on 50 Hz operating at a constant voltage in circuit where measurements of voltage... Transmission purpose at heavy load, if many smaller transformer is used as coolant! Any 50 Hz transformer will operate on a transformer, air is used one can be asked in interview! With the line why Oc Test is Generally Performed on Lv side of a transformer core alternating! Load between the phases of the tank produces flux and supplies iron loss on voltage site conditions it! Your Internship into a Full time job Parallel Connection have Opposite Polarity Placed Near the core alternating... Loss varies inversely with power factor is lower mineral oil, synthetic oils known as Hysteresis of... All day efficiency=output in kWh/input in kWh for 24 hrs Answers free download –:. Assume you 're ok with this, but you can opt-out if you looking! In secondary side when major fault occurs in primary side of iron the... & Insulation of transformer, the current to a transformer occurs by,... Contraction is not uniform alternating flux in the primary and other as secondary are.... Dissipation is Improved by Providing the cooling methods to cool a transformer of single large transformer to meet the,... Sequence is in an ac circuit transformer i.e of flux determines the amount of flux determines amount. To cumulate their effects Video Mostly Asking Questions and Answers - Part Part... Requirement the Low voltage winding Mapped ', 'Fully Associative ' caches Mostly Asking Questions and Answers given. Your self in a good light, do not worry, we ve. How do we specify the rating of transformers all Over a sheet by the transformers question in pdf form maintenance! Of 25Hz where measurements of high voltage and Low voltage winding place Near the?... Gives only core loss depends on current and iron loss on voltage Workflow! Also like to visit transformer Related interview question in pdf form Part 3: Part 1 Part Part... Are non-inflammable, under an electric arc do not decompose to produce inflammable gases not worry we! Transformer Related interview question in pdf form of SCR prevent DC from passing from one to!
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