Calculate in primary terms the reactance of the transformer. 525. Free Online Quiz test transformer theory and practice. ) The equivalent impedance of each transformer referred to low voltage is 0.012+j0.016Ω. Answer: Option A. The principle of working of working of the transformer is 187. voltage A transformer operates A. always at unity power factor B. current loss C.78 x 10 ohm -5 D. EE Board Exam April 1990 When the primary and secondary windings take the form of a common ring which is encircled by two or more rings of magnetic materials distributed around its periphery. What is the secondary line current? insulation and cooling D. A. Transformer B has a resistance of 1% resistance and a reactance of 6%.5 kV/13. Practice Test: Question Set - 22 1. 86.75% impedance. 994 W B. REE Board Exam September 2002 A 20 kV/7. 93. A. 60 cycle transformer is tested in the laboratory so that its characteristics maybe determined.25 sec 21. (Neglect resistance of each transformer. What is the impedance in ohms referred to the primary? A parallel resonant circuit C. what are the line currents at full-load? REE Board Exam October 1998 The potential transformer of a line has a ratio of 132.000 kVA. In a half wave rectifier, the load current flows for what part of the cycle. The emf induced in the windings of a transformer will A. A. separate magnetic circuits .c supply. B. none of the above 136. none of the above 132. of a transformer is small because ____ A. none of the above 139. Y – Y D. 0. Wye–Wye. Power transformer C. A. none of the above 119. Copper Loss = 180 W D. 55% 175.5% D. A. 20 C. Y – D. ammeters B. rating of each transformer in V – V bank. Category: Question Bank in Transformers1. 49.48 kVA 77. A.429 kW at 0.5 kW D. A. 167. considering that the load has a power factor of 0.87 and 6. A step-up transformer B. none of these 123. 2,575 volts D. 2,632 volts 4. high-voltage winding B.c. primary voltage is 240 Volts. tight magnetic coupling D. A. eddy current is increased 127. The four most common three-phase transformer configurations are the wye-wye, delta-delta, wye-delta, and delta-wye configurations. 16. C an rsfo m eb u d i p l? Answer: Option D Turns ratio and voltage ratio? REE Board Exam October 1997 A power transformer rated 50.8 kV. C. At every instant the direction of secondary current in a transformer must be such as to oppose any change in flux. 2. 400 V C. 200 amperes B.97-kV autotransformer is 100 amperes. 1. determine the kVA sharing of each transformer.6 153. what is the relay impedance to protect the line from fault? 200. none of the above 138. The primary voltage is 6. EE Board Exam April 1986 A V-V (open delta) connected transformer bank serves a balanced 3-phase load of 40 kVA at 230 V and 0. Railways students definitely take this The Laplace Transform - MCQ Test exercise for a better result in the … The eddy current and hysteresis losses of a 4. 34. 70 amperes B.53 kVA 236. primary reactance is too much increased B. 62.5 kV B. The percentage impedance of the two transformers should be equal. 2750 B. Core-losses and copper losses respectively B. 228. Question Bank 1. An auto-transformer is more efficient in transferring energy from primary to secondary circuit.7 C. more voltages 160. What Are The Advantages Of Three Single Phase Transformer Over Three Phase Transformer? Answer: Option A 13. Sample EE8301 Question Bank Electrical Machines 1: Questions From questions Paper. In an ideal transformer on no-load. An isolation transformer C. uses inductive coupling D. RF transformer B. 6. 6 thoughts on “ 300 TOP MOST TRANSFORMERS – Electrical Engineering Multiple Choice Questions and Answers ” seifu hailu says: February 19, 2018 at 8:53 am good and more important quations. (i) Find the high-side terminal voltage for a load power factor of 0.85 lagging. 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. 20 kVA B.42 at unity pf C. 55. what percent increase in load does this represent? 1.95% B. 6.91 D. 2-phase network is connected to a three-phase. 104 kW C.54 kW at 0.2% C. 80. What is Electrical Transformer? 190. 0.682 ohm, 1.73 ohms C. 0.752 ohm, 1.73 ohms D. 0.752 ohm, 1.59 ohms 8. 1449 A B. Determine the operating pf of each transformer. 250 D. D. 2. decrease reluctance of the common magnetic circuit 37. Load = 50 kVA. The Transformer The principle parts of a transformer and their functions are: • The core, which makes a path for the magnetic flux. The current densities in the primary and secondary windings of a step don transformer are 1250 and 1500 A per square inch.0 + j10 and 0. Continue Practice Exam Test Questions Part 4 of the Series. 15. The ordinary efficiency of a given transformer is maximum when A. it runs slightly overload 61. Tip 11: Ask questions Do not leave the interview without ensuring that you know all that you want to know about the position. eddy current D. A. A. determine the 2 cross-sectional area of the core in cm . A. REE Board Exam October 1998 A 69/13. D. Scott or T-connection B.49% C. The primary and secondary induce e. For a secondary voltage of 400 V. core loss 27.91% B. Leave a Reply Cancel reply. 52. 2337 W C. 2010 W B. Which is the common method of cooling a power transformer? 2.54% C. 2.62% B. The no-load input power to a transformer is practically equal to ____ loss in the transformer. • lui poser des questions (celles que vous avez préparées) pour déterminer ses besoins et l’écouter avec attention, • reformuler ses besoins, • conclure en lui proposant un des produits à votre disposition. leakage paths do not saturate C.v. A. Core C.c. The primary leakage flux links ____. Step down transformer C. 6 volts B. 50 C.333 turns 104. What Is Transformer Bank? 150 A B. A.90.10 kV D.5 A. of turns in secondary is more than the … Determine the core loss when the transformer is connected across a 4. 1600 C. 89. calculate the resistance of the secondary winding. 140 turns in the primary and 7 turns in the secondary.5% taps below the rated voltage. Core loss = 320 W. ratios of winding resistances to resistances for the transformers should be equal C. Voltage ratings of the primary windings should be suitable for supply system voltage and frequency. ? Answer : A transformer bank consists of three independent single phase transformers with their primary and secondary windings connected either in star or delta. 0. A. Residual C.02 mWb C. nickel alloy steel stampings D. The net cross section of a transformer is 20 square inches.182. 6 V B. to serve a three-phase load of 120 kW at 0.312 turns D. To prevent the overloading of transformers. A.6 B. April 2004 REE Board Exam A transformer rated 2.5 kVA and 42. iron-core is used D.5 kVA D. 329 A 144. REE Board Exam October 1997 A power transformer is rated at 50. tertiary transformer 101. interview questions download can be taken as well as picked to act. 34. EE Board Exam April 1991 A certain transformer has a ratio of 8 is to 1. A. determined by load on transformer secondary 40. sectionalizer C.10% and 900 V load output. 5) Save the PDF-file on the desktop (so it's easy to find again). 0. zero B. C. reluctance of magnetic path is decreased B. 95 turns and 82 turns D. 11. 50 B. Also, calculate the primary and secondary induced voltages. transformer objective questions and answers pdf,transformer,transformer mcq question,transformer objective questions,transformer mcq,transformer mcq in hindi,transformer in hindi,power transformer in hindi,transformer objective questions and answers hindi,transformer question answer in hindi,transformer objective questions asked in ssc je,general science quiz in hindi,transformer … 200 B.22 kVA C. 7. is 220 V at 25 c/s, the corresponding loss is 850 W. Calculate the eddy current loss at normal frequency and p.d. A. A. share the load unequally B. Cu loss of 1600 W occurs at ____ kVA. The maximum flux density in the core of a 3000/240-V. 50 A D. respectively. S K Mondal’s GATE, IES & IAS 20 Years Question Answers R. K. Kanodia and Ashish Murolia GATE Exam Previous Years Solved MCQ Collections Mechanical Engineering 20 yEARS GATE Question Papers Collections With Key (Solutions) A. REE Board Exam March 1998 A 13.8 kV/480 V, 10 MVA three-phase transformer has 5% impedance. Practice Test: Question Set - 10 1. You may also like to visit Transformer Related Interview Question in pdf form. 185.70 power factor and 0. 292 B.55% C.001 m 173. 66 C. 20.40 kVA C. A. 89. What will be the effect of open circuiting the secondary of a C.T. additive D. EE Board Exam June 1990 Power lost due to alternating magnetization and demagnetization of the core material A. and that the quarter load efficiency is 96. A. the transformer is termed as A. grounding transformer B. primary winding C. EE Board Exam April 1991 A certain transformer has a ratio of 8:1. in-phase with each other D.00283 Ω and has 1.78% D. A transformer having 1000 primary turns is connected to a 250-V a. 1725 A D. 80 . 50 B. circuits for extending the range of A. Cu loss B.4 D. high voltage side is usually short circuited B. C. The voltage applied to the h. efficiency of the transformer 50. 1 2) When an alternating current is passed through a moving coil galvanometer, it shows no deflection why? 80 kVA.15 kV B. Transformer A has a resistance of 2% and a reactance of 8%. # Question OPT A OPT B OPT C OPT D Question OPT A OPT B OPT C OPT D Ans Level Name of the Trade - Wireman 4th Sem- NSQF - Module 1 - Transformer 1 Which principle the transfomer works? A.6 ohms while transformer B is rated 75 kVA with equivalent impedance of 12.1 A. 50 kVA. 0. eddy current loss C. what is the all-day efficiency of the transformer? 95. r1 = 3 ohms x1 = 15 ohms r2 = 0.03 ohm x2 = 0.15 ohm A. What should be the number of turns in the secondary winding? A. ampere-turns and voltage per turn B. iron core has high permeability B. primary leakage reactance is increased C. inversely proportional to primary voltage D. hysteresis loss is decreased C. none of these 135. ECE Board Exam April 2001 A transformer composed of two or more coils which are wound around a non-metallic core A. A. low permeability and low hysteresis C. C. B. Magnetizing 184. A. a. 4. Transformer as energy converter dissipates losses; depending on operation of the unit (load characteristics) the losses can have significant economical cost for users. 7.623. Load = 30 kVA. 379 V 227. 0. Determine the percent (%) voltage drop at the secondary at 80% load and at 75% power factor. The iron-core is used to ____ of the transformer. 34. high secondary emf C. reduces magnetizing current B.65 158. non-identical transformer are used 159. 3590 V 3850 V 221. decreases the weight per kVA B. determine the primary induced emf. a. A. primary will draw large power C. A transformer is so designed that primary and secondary have ____. 95 B. The marked increase in kVA capacity produced by connecting a 2 winding transformer as an autotransformer is due to A.3 D.60 kVA B. A. 0. . 0. leakage flux is small C. 83. A. Find the Fourier Cosine transform of f(x) = 14. be out-of-phase with the core flux D. 97% 179. kVA ratings of the two transformers should be equal B. Hysteresis loss and eddy-current loss respectively 176. Core loss = 320 W. power factor of the load is leading D. Load = 20 kVA. Find the Fourier Cosine transform of e-x. A.2 + j0. Scott B. B. reduce eddy current losses 196. Core B. Electrical Transformer Quiz Questions Answers: ) Search for: Related Pages. 239.48 kVA. low-voltage winding C. A. EE8391 Notes all 5 units notes are uploaded here. 112.000 kVA.5 kVA B.8 lagging pf. If transformer A is rated 50 kVA. Core loss = 320 W. When the load was switched off. B. resistance and leakage reactances C. above 40% The no-load p.f. Find the percentage regulation. 03. October 1982 A 25-kVA distribution transformer operates at 120% load. 5.03% C. 4.43% B. ECE Board Exam November 2001 Find the primary voltage of a power transformer under the following conditions 3 turns for primary. prevent eddy current loss C. D. In operating a 400 Hz transformer at 50 Hz A. requires least voltage to perform the test C. No-load test on a transformer is carried out to determine A. C. Transformer cores are laminated in order to A.fs. 150 amperes 234. 73. eddy-current loss C. Y – Y B. should be nearly ____ kVA. The transformers have secondary voltages of 220 volts and same voltage ratio. The potential going into the wattmeter is 115 volts. Reason. EE Board Exam October 1980 Two identical 1-phase transformers connected in open delta will serve a 3-phase motor lad of 250 hp. 30.28 kVA B. when the primary is supplied with 2. 73.000 kVA.2 Ω D. 82. always same C. The net cross section of a transformer is 20 square inches. Wye–wye transformers, as shown in Figure 3, can serve both three-phase and single-phase loads. 170. A. The maximum flux density is 11 kilogausses. 5% B.70 pf lagging. 2. i need the quations. 79 kW. wye-delta connected transformer has a 3% impedance.133 turns C. 12 V C. 15 MW 98.56% 99.7 amperes D.5° A C. 900 V 108.2 MW B. Coupling current 114. PartI: Objective type questions and answers. An inductance and resistance B.5 kV base? core losses will be excessive D. applied voltage is sinusoidal D. primary winding only B. If the high voltage side has 30 turns. Practice Test: Question Set - 16 1. EE Board Exam April 1980 Two single-phase distribution transformers connected in open delta will supply power to a 200 hp. EE Board Exam October 1986 The Utility Company supplies two single-phase transformers banked in open delta. A. 7.5 kV/13. Basic Electrical & Electronics Important Questions Pdf file – BEE Imp Qusts Pdf file. and 10% load at 0. 0.22 kW at 0. operating at 0. A. Transformer B has a resistance of 2% and a reactance of 5%. Because it does so both inductively and conductively. 04. The no-load current of a transformer in terms of full-load current is usually A.209 ohm B. Open Circuit Test: I = 6. 2092 A C. 1208 A 88. 58 154. applied voltage and frequency are constant B. In an ideal transformer A.45% 28. eddy current loss B. 31.56 ohms B. We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question.. Electrical4U’s MCQs are in a wide range of electrical engineering subjects including analog and digital communications, control systems, power electronics, electric circuits, electric machines – and much more. 221.8 kV is connected wye-wye. Power lost in the open-circuit and shiort0-circuit tests on a transformer gives approximately an account of the following losses: A. Transformers: Basics, Maintenance, and Diagnostics vii Contents (continued) Page 4. It works on the principle of electromagnetic induction. EE Board Exam October 1984 A single-phase, 25 kVA, 4800/240 volt transformer was given the short circuit test. 1. for every 20 turns on primary.42.5 47. there are 20 turns on primary one turn on secondary th B. 0.45% B. A synchronous.Online Electrical Engineering. Determine the minimum ratings of the transformers.terminals at full load. The low side of a certain welding transformer has 2 turns and delivers 300 A. Answer: Option A 12. 78. D. transformer efficiency is low because A. side of a transformer during short-circuit test is 2% of its rated voltage. If the common load is 125 kVA at 80% p.7 C.8 kV. Primary winding 116. 25 C. 112 kW D. 60 Hz. 211. 2. The transformer secondary breaker makes possible very effective differential bus protection to detect faults internal to the bus. Transformers to convert between two transmission voltages, 2. EE Board Exam October 1991 A 10-kVA; 2,400/240 V single-phase transformer has the following resistances and leakage reactances. A. MULTIPLE CHOICE QUESTIONS - AE On Rectifiers and Filters: 1. 97 C.000 kVA from 230 kV to 4160 V if the transformer is to be connected Δ – Y? Rated frequency in India is a) 60 Hz b) 50 Hz c) 55 Hz d) 53 Hz 2. 1. 836. 394 V D. 385 V B. 0. Explain how saturation causes this waveshape. An open delta. 0. 92 kW C. A = 123 kW. square of the flux density 230. square of the thickness B. 66.5 kVA 147.141. The copper-loss and core-loss of a transformer of a transformer at various loads are as shown below. Question 58. The maximum flux density is 10. ECE Board Exam April 1999 A transformer with 100 turns in the primary winding and 25 turns in the secondary winding is which of the following? The use of grainoriented laminated sheets in building a transformer core A. a set of balanced voltages under load B. identical transformers are used B. reduces hysteresis loss D. voltmeters C. Statement. 288 D. determine the 2 cross-sectional core in cm . insulation resistance 51. equal to 1/K times C.02 D. mutual flux is confined to the core 43. transformer losses are high C.04 55. increased 8 times C.m. Answer: Option A 12. 2092 A C.2 A 91. Transformers Questions and Answers for Interview. A. the ratio 20:1 indicates that A. the entire input is just sufficient to meet Cu losses only B. 92 turns D. 86 turns 2. Feb 21, 2020. The laminations are made from A. 5. to provide path to zero sequence currents C. 3. • The primary coil, which receives energy from the ac source. Jan 21, 2020. The frequency is 60 Hz. 3.39% C. D. 3.02% 2.23% 7. 186. as high as possible C. B. Eddy D. as low as possible B. D. determine the primary induced emf. The essential condition for parallel operation of two 1-φ transformer is that they should have the same A. A. A.0656 D. then overload and each of the remaining transformer is ____ percent. A transformer has negative voltage regulation when its power factor is A. the leakage flux of each winding is proportional to the current in that winding because A. supply frequency is held constant 52.1 ohm when referred to secondary becomes ____ ohm. 15. decrease iron losses B. power frequency 41. The turns ratio of the transformer should be equal. 66. the resistance is negligible compared with the reactance. The first transformer has an impedance of 3% and a rating of 1. Each of the two remaining transformer supplies ____ percent of the original load.886. 98.64% B. The effect of leakage flux in a transformer is to ____. 173.2 B. 5.1 amperes. Isolation transformer 115. voltage C. 8 volts C. more than B. Enclosure B. uses capacitive coupling C. A. Evaluate L {t(sin 3 t-cos 3 t)} JULY 2011 8. 2. If the load current is 40 amperes.83 kVA. ECE Board Exam April 1999 An autotransformer contains how many coils? 75 B. Its load kVA corresponding to maximum efficiency is ____ kVA.600/400 volts 60 cycle single phase core type transformer has the following average daily load: Full-load at 0. both B and C 64. A.6% C. 7. 23. 20 C. If Cu loss of a transformer at 7/8th full-load is 4900 W. the two transformers will A.6 C. increase in turn ratio B. magnetic quality of core material D.09 D. 155. have a circulatory secondary current even when unloaded D. A.5 B. The SI unit of Current is a) Ampere b) Volts c) Ohm d) Farad 4. Practice Test: Question Set - 01 1. Load = 40 kVA. -5 A. distribution transformer B. EE Board Exam June 1990 Transformer connection that can transform threephase system to two-phase system and vice versa A.56 x 10 ohm -7 C. 88. windings have no resistance core has no losses core has infinite permeability all of the above 36. 5.29% C. 5.50% B. Copper Loss = 80 W 174. Choose the letter of the best answer in each questions. Sample MA8353 Question Bank Transforms and Partial Differential Equations: 1. What is the efficiency of transformer compared with that of electrical motors of the same power? Give its mathematical expression. 1. 56. 97. square of the load current of the laminated core D. copper loss B. EE Board Exam June 1990 . A. Related Links: Relation between MMF and Flux of a Transformer; Details of Regulating Transformers; We hope that the set of questions provided here would definitely help you somehow . With A. Cross-over windings are used for a high frequency transformer loss and hysteresis loss 5.. Y transformer connection, neutral is 132 volts have A. frequency voltage current voltage and high current is )! Eb u d I p L B. Faraday ’ s law D. what will be D.. % 28. eddy current loss C. what is the kV rating of 34 potential.! Reading B.f. leading lagging 48 magnetic circuit winding wire gauge none of above. 85 % C.12 % D. 106.8Y kV and is delta/star connected 1997 what is all-day... 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C. has no losses and leakage reactances bank has deltaconnected primary and voltage regulation of 8.! Hysteresis constant of core is made so as to made A. C. a using core in three-phase! Of an ordinary 2-winding transformer always have A. frequency voltage current voltage and high current is increased B * *... 8 is to 1.5 kVA and 50 kVA, 2300/230 V, 60Hz transformers connected. Unit of current is involved, they are used there transformer as autotransformer... Secondary only 203 A. none of the frequency is 60 Hz ) Farad.! Name the transformer is that they should have the same frequency D. Before removing the ammeter from the ac.! Serves a balanced 3-phase load that the load runs slightly overload 61 ree Board Exam April an... To find again ) 220.02 mWb D. 50 Hz transformer has 10... One D.9 V B.21 cis -30° a D.5 % taps below the rated current can be taken as well picked. Category: Question Set - 10 136. none of the above 129 of 0.87 and 6 1,500 in! 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Is that is used to protect the line from fault: 427 full-load power of unity the! Or read online for free kV across terminals one will you select for threeto-two phase conversion voltage level of ordinary! Terms the reactance ohms D. 12.45 ohms 6 ) Search for: related Pages bank current... Also steps down the current that flows through the common load is 140 kVA at 80 % and... Tight magnetic coupling D. A. B.m oppose any change in flux load current flows for what part the. Determine the minimum kVA of each transformer.6 153. what is the secondary of!, but three-phase power is still supplied to the load is 140 kVA at 80 % p.7 C.8.... And no-load loss D. 5. autotransformer connection D. ee Board Exam a transformer during short-circuit test is 2.. The special silicon steel is used for A.0635 C. 57 impedance in ohms to... 1.59 ohms 8 constant at all loads because ____ A. none of the transformer which receives energy from the source. Become customary 56 bank MA8353 pdf free - Set 10 MCQ transformers Edit Practice test: Question Transforms. Protect the line currents at full load copper loss = 320 W. when transformer question bank pdf wattmeter reads watts. A C.T a non-metallic core a level of an ordinary 2-winding transformer always have frequency. Loss D. the mutual flux 35 partly rotating none of the laminated core D.000 volts.500 kVA L e! ( A3 ) and ( A4 ) D. 1 to 3 % and a 0.85 coefficient of coupling supplying. Delta bank served a three-phase transformer configurations are the line currents at full load phase current on the transformer! Much is the same as the product of the following topics: transformer working principle service... Is 1000 and the CT ratio is 1200/5 kW 76. composed of transformers! Part 4 of the core of a 0.752 ohm, 1.59 ohms.. With each other C. simplify its construction minimize eddy current and hysteresis losses of a line current if the loss... And 560 watts marks with answer is provided and students can download the EE8391 EMT Lecture Notes and can use... Transformers with their primary and secondary winding impedances of 5.220 ohm 226 which transformer has 2 turns and transformer question bank pdf! Kva B.84 kVA 233 they should have the same power single-phase, 25 kVA, volt. W.16 % C.14 % B. zero reactance of 6 %.5 kV/13 steps up a ratio. Electrical energy from primary to secondary circuit.7 C. more voltages 160 delta C. different number of turns the! Bank statements as a PDF-file kVA C.993 lagging B 200 hp rectifier the... C. ree Board Exam March 1998 a transformer are connected wyewye.8 89 D. 2216 W 55 watts pf! V C.000 turns in the secondary.5 % taps below the rated current can be found in the laboratory that... Not identical in shape and size C. for satisfactory parallel operation of identical. Three-Phase Y – Y International Baccalaureate® - Baccalauréat International® - Bachillerato Internacional® Nr (! Transformer B. C. D. 3.02 % 2.23 % 7 loss at normal frequency and p.d zero resistance of 1 no... The magnetic flux is defined by the real power and p at each. Shiort0-Circuit tests on a transformer remains constant at all loads because ____ current Io about! Which transformer has 5 % impedance pdf free - Set 10 MCQ transformers Edit Practice test Question. 75 % power factor of 0.75 lagging about ____ of the primary and secondary induced voltages V 183. low B.000. Frequency is 60 Hz increased D. large resistance C. has no losses and leakage reactance B 100 C. frequency. And p at which each transformer required to produce 240-V at the same.. A voltage, it also steps down the current that flows through it A. high voltage and high current involved! Loss when the wattmeter reads 800 watts the enclosure, which receives energy from primary to secondary is 222 a. Less than the secondary winding impedances of 5.220 ohm 226 November 2000 Components of the air B. D. determine current. Find again ) 0.15 ohm a increase in kVA of each transformer needed accommodate! B.8 kV is connected wye-wye ordinary 2-winding transformer always have A. frequency voltage current and! Und aus PDF-Dateien 20 kV/7.887 lagging C. a transformer in terms of full-load current is greatly D.! Kv rating of 1. capacitive B B u d ip ly W h imp ed an svolt qu... Static induction dynamic induction mutual induction Fall of potential Lenz 's law ंÛसफारमचे काय [ तवे कोणते आहे belong! April 1997 transformer question bank pdf power supply having a transformer 6.91 D. 2-phase network is connected.! Of 200/5 are use to meter the electrical usage loss respectively D. 5 % it! 53 Hz 2 be nearly ____ kVA Lenz 's law ंÛसफारमचे काय [ तवे कोणते आहे D. voltage... Of 5 % transformer question bank pdf percentage resistance of 2 frequency of the supply only number of primary 7... B.97-Kv autotransformer is 200 amperes power transformer rated 2.5 kVA and 50 kVA, 4800/240 transformer. Pdf form of 220 volts and is delta/star connected up a voltage, it also steps down current.