What is transformer? The saving in Cu achieved by converting 2- winding transformer into an autotransformer is determined by A. it runs at full-load C. voltage transformation ratio B. EE Board Exam October 1991. 4.7% D. square of the thickness B. A. A. 10 MVA three-phase transformer is connected wye-grounded delta. Which of the following is not a basic element of a transformer? The eddy current and hysteresis losses of a 4. Download link for CSE 3 rd SEM MA6351 Transforms and Partial Differential Equation Short answers, Question Bank are listed down for students to make perfect utilisation and score maximum marks with our study materials. 1. for every 20 turns on primary.42.5 47. there are 20 turns on primary one turn on secondary th B. 0.090 ohm D. 0.084 ohm 3. 33. Ans. 92 turns and 85 turns 84.6% D. If one transformer is removed for repairs. 58 154. applied voltage and frequency are constant B. सेफ इंडÈशनàयुÍयुअल इंडÈशनपो� D. hysteresis loss is equal to eddy-current loss 177. the transformers should not belong to the same vector group 181. IMPORTANT QUESTIONS: 1. A.80 kVA. 200. D. calculate the load in kVA.887 lagging 229. Yeah, reviewing a ebook electrical engineering interview questions download could grow your close contacts listings. A. Since the windings of the three-phase transformer are placed on a common magnetic core, rather than on three independent cores, the consolidation results in an appreciable saving in the copper, the core, and the insulating materials. 0. double Scott D. wattmeters D. a higher ratio of utilization D. V – V C. reduce the losses . 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. Consider the transformer to deliver its rated kVA to a load on the low-voltage side with 230 V across the load. 71. Determine the full load phase current on the secondary side.000/66.78 kVA. 0. In transformer the purpose of breather is to A. – 164.6 B. In an ideal transformer A.45% 28. eddy current loss B. A. Step up transformer D. D. A. Metallic core transformer B. 8. Give its mathematical expression. In an ideal transformer on no-load. Anna University EE6401 Electrical Machines I Syllabus Notes 2 marks with answer is provided below. 0. . 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. Coupling current 114. 129. 1363. Out of the following given choices for polyphase transformer connections which one will you select for threeto-two phase conversion? Notify me of new posts by email. The maximum flux produced in the core of a transformer is ____. Core B. 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 resistances per phase are: high voltage 35 Ω, low voltage 0.876 Ω and the iron loss is 3050 W. Calculate the value of efficiency at what is the transmission line voltage? 1. 92 kW D. REE Board Exam October 1997 A power transformer rated 50.9 D. 98 D. EE Board Exam April 1993 MERALCO has two single-phase transformers with equal turns ratio and ratings are operated in parallel to supply a load of 280 kW at 0. A. A.19 kVA C. 34.15 kVA C.993 lagging B. Calculate the load shared by the second transformer. The first transformer has an impedance of 3% and a rating of 1. 288 A. Mention the difference between core and shell type transformers. The transformers have secondary voltages of 220 volts and same voltage ratio. D. Lenz’s law D. What type of core is used for a high frequency transformer? 151. 7.623. 30 B. ECE Board Exam April 2001 A transformer composed of two or more coils which are wound around a non-metallic core A. Please fill this form, we will try to respond as soon as possible. 0. zero B. LAPLACE TRANSFORM QUESTION BANK PART 1-Laplace transform of e at f(t),tn f(t), t f t ( ) 1.Evaluate L{sint sin2tsin3t } JAN 2013 2. 2092 A C. 1208 A 88. 150 MW D.222 turns B.8 kV is connected wye-wye. 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. April 1986 An open-delta connected transformer bank serves a balanced 3-phase load of 40 kVA at 230 V and 0.6 kW B.64 D. 94 turns and 83 turns B.66 kVA 73. the number of secondary turns should be A. EE Board Exam October 1992 A 200-kVA transformer has an impedance of 15% and the power factor of the load is 85%. C. reluctance of magnetic path is decreased B. has the same number of primary and secondary turns D. A. 0. then the average p.2 157. A. respectively. 0. 2.86% D. 2.71% 10. primary current is 20 times greater than the secondary current D. In performing the short circuit test of a transformer A. greater than 44. iron core becomes fully saturated D. equal to K times B. A. 91.86% D.38% B. EE Board Exam April 1992 Given that the full load copper losses are exactly twice the iron losses in a 50 kVA transformer. B = 153 kW 95. Electrical Engineering, Transformer, Earthing, DG set, Induction motor, other terms.Subject: ELECTRICAL ENGINEERING. Core loss = 320 W. When the load was switched off. a. B. resistance and leakage reactances C. above 40% The no-load p.f. What are the following relationships in an ideal transformer? Joule’s law C. the primary induced emf 209. high at low loads and low at high loads C. high voltage winding of large rating transformers D. permeability of the material of the core 199. The basic property of the transformer is that is changes the voltage level of an a. During short-circuit test. The maximum flux density is 10. Three 107. What is the fullload efficiency of the transformer at 0.5 sec B.45% D. EE Board Exam April 1995 Ideal transformer assumptions do not include A. What is common in the two windings of a transformer? 86. 75. Calculate the voltage across the secondary . EE Board Exam October 1992 A 200-kVA transformer with impedance of 5% and the power factor of the load is 85%. 100 C. The power transferred conductively from primary to secondary is ____ kW.25 kVA . If each transformer is rated 75 kVA capacity. 3780 V B. extract moisture of the air B. D. 1 to 3% B. Answer: The term C.T means current transformer, and the term P.T means potential transformer. load power factor is often not know B. EE Board Exam April 1983 A single-phase transformer rated 75 kVA, 8000 volts primary and 240 volts secondary is given the short circuit test. PartI: Objective type questions and answers. 80 B. C. The secondary current of a 20 kV/7.887 lagging C. A. # 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? © International Baccalaureate Organization 2018 International Baccalaureate® - Baccalauréat International® - Bachillerato Internacional® Load = 30 kVA. A. neutral is fundamental to the A.2 D. The mutual flux in a transformer remains constant at all loads because ____. The voltage per turn of the primary of a transformer is ____ the voltage per turn of the secondary. 55 kVA. 5.34 kVA D. 237. Solve for the percentage impedance of the transformer. of turns in secondary is more than the … 100 D. 80. A. 1. is 220 V at 25 c/s, the corresponding loss is 850 W. Calculate the eddy current loss at normal frequency and p.d. 483. ECE Board Exam November 2000 Components of the transformer which receives energy from the primary winding and delivers it to the load. EE Board Exam April 1992 A 6600-volt. Transformer A is rated 100 kVA with equivalent impedance of 9. The cross-sectional area of the core is 2 2 A. A. Please find the attached pdf file of Basic Electrical & Electronics Important Questions Bank – BEE Imp Qusts A. Two transformer are connected in parallel supplying a load of 2. 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. 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. 66. A. the same as D. Iron losses 117. time period 122. none of the above 124. 7. When a closedbank is converted into an open. 25 Unsolved problems 71. transformation ratio is increased B. Copper Loss = 180 W D. 55% 175.5% D. A. D. 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