X S = X L + X ar. But there are some benefits while performing the OC test on LV side of the transformer. Questions-8.An open circuit test on a transformer gives____ A.Friction losses B.Iron losses C.Total losses D.Copper losses. Using soft material for windings. The wattmeter, ammeter, and voltmeter are connected to their primary winding. Which of the following Transformer can have tap changer? Using transformer oil for better quality. Due to this, the analysis by approximate equivalent circuit gives fairly satisfactory results. 28. Most Asked Transformer MCQ. 44) In a transformer, the resistance between its … No answer description required for this question. Leaving this switch open prevents the output circuit from affecting the measurement of input impedance. The purpose of using transformer oil is to (a) provide cooling. 2. This is becouse: Option-1 : it draws sufficiently large no-load current which can be conveniently measured. For testing the short circuit test all meters ( i.e ammeter, wattmeter and volt meter ) are connected to the high voltage winding and the low voltage winding is short circuited which is shown in the figure. Determination of Transformer equivalent circuit from Open Circuit and Short Circuit Test. 3. Hence low pf wattmeter is used to measure iron losses of transformer. Views: 5 A single phase transformer of 2200/220 V having rated l.v. Transformer Shunt Branch Parameters like Rc and Xm. During open circuit test transformer works at very low power factor. When the square wave is given to primary to a transformer then secondary will gives (a) no waveform. Decreases. side, so the measuring instruments will be on the h.v. 8 Comments / MCQ. These tests give more accurate result than compared with the fully loaded transformer. The power required for open circuit tests and short circuit tests on a transformer is equal to the power loss occurring in the transformer.. Open Circuit Test on Transformer. Transformer Tests MCQ Question 10 Detailed Solution. In a 100 kVA, 1100/220 V, 50 Hz single-phase transformer with 2000 turns on the high-voltage side, the open-circuit test result gives 220 V, 91 A, 5 kW on low-voltage side. Open Circuit Test. Open circuit test and short circuit test both provide all the parameters of equivalent circuit. 11. A voltmeter, wattmeter, and an ammeter … (c) inductive. The open-circuit test on the transformer is performed to determine magnetizing reactance and equivalent resistance due to iron loss. (b) absorb heat. A. low voltage winding. 2. 25.2.2 Open Circuit Test To carry out open circuit test it is the LV side of the transformer where rated voltage at rated frequency is applied and HV side is left opened as shown in the circuit diagram 25.1. Short–circuit test on transformer gives _____ losses. This test is performed on the primary winding of the transformer. And Low-voltage side of the transformer is short-circuited by thick wire or ammeter. Open circuit test and short circuit test on transformer are very economical and convenient because they are performed without actually loading of the transformer. 2 - Question. Resistance. This test is also known as the no-load test. Answer-B Solution-Open circuit test or no load test on a transformer is performed to determine ‘no load loss (core loss/Iron losses)’ and ‘no load current I 0 ‘. Explanation: The V-V connected transformer and D-D connected transformers have same phase displacement, so they only can be connected in parallel to each other. Option-2 : eddy current loss. Multiple Choice Question (MCQ) of Illumination page-5:41. If a transformer is fed from a 220V and dc supply rather than a 1-phase ac supply, then the transformer will ... Power required during the open circuit and short circuit test is (a) losses incurring in … The open circuit test, performed with the high voltage side open, gives = 100W, = 1.1455A. 343. These two transformer tests are performed to find the parameters of equivalent circuit of transformer and losses of the transformer. Open-circuit test, and; Short-circuit test. Using the magnetic core of low reluctance. (d) all of the above. 1 - Question. Basic Definitions. The function of a breather in a transformer is. 45. The open-circuit and short-circuit tests give more accurate results than those are obtained by performing the measurements on a fully loaded … Short Circuit Test. Question is ⇒ An open-circuit test on a transformer is conducted primarily to mesure, Options are ⇒ (A) insulation resistance, (B) copper loss, (C) core loss, (D) total loss, (E) efficiency, Leave your comments or Download question paper. This test is conducted at rated current. Thus, Open Circuit Test gives us the following information: Transformer Core Loss at rated voltage and frequency. The short circuit test, performed with the low voltage side shorted, gives = 180W, = 129:79V. MCQs on Transformer. Q 5. D. total losses. Explanation: Short circuit test is used to determine the copper losses taking place in the transformer under operation, while open circuit test gives us the value of core losses taking place in the transformer. Increasing the number of turns. Then which losses will increase: a) eddy current b) hysteresis c) copper loss d) both a and b 6. Open circuit test – In this test the High Voltage (HV) side kept open and the voltage is applied to the Low Voltage (LV) side of the transformer. High silicon content steel is used for transformer core construction to. The purpose of the open-circuit test is to determine the no-load current and losses of the transformer because of which their no-load parameter is determined. It determines the copper loss occur on the full load. The circuit diagram of the short-circuit test is as shown in the figure below. Open & Short Circuit Tests in Single-Phase Transformer - MCQs with Answers. 341. This test is similar to the open circuit test on transformer . The power transformer is a generic electrical transformer which specifically used to transform power from input to output without changing into the frequency level. current of 150 A has to undergo open circuit test on h.v side. TRANSFORMER MCQ 1. Either option a or b. The short circuit test in the transformer is always carried on the high voltage side mainly due to the power supply limitations used to perform the transformer's short circuit test. The primary purpose of performing a short circuit test in a transformer is to calculate the transformer's positive sequence impedance (Z). No negative points for wrong answers. When the frequency of applied voltage in a series RL circuit increases, what happens to the inductive reactance? Transformer Open Circuit and Short Circuit Test. Its efficiency at half load and unity power factor. The open circuit and the short circuit test gives a very accurate result as compared to the full load test. The ammeter at primary and secondary side reads the primary and secondary current respectively. MCQs on Electrical Circuit Theory. Source: https://www.omicronenergy.com Normally transformers are tested at no-load. The no-load test is the same as the open-circuit test performed on the transformer. Question 10 : The open circuit test on a transformer is usually performed by exciting the low voltage winding. The connection diagram for the short circuit test on the transformer is shown in the figure below. The open circuit on a transformer is conducted at a rated voltage because core loss depends upon the voltage. 9.1 A B. In doing so errors introduced due to winding copper loss and core loss are of different nature. 5 Keeping constant voltage, by increasing the supply frequency of the transformer the magnetising component. 1. Short Circuit Or Impedance Test On Transformer The connection diagram for short circuit test on transformer is shown in the figure. Answers are … Transformer MCQ. 3. The core loss of a transformer is independent of load; it depends upon rated voltage. March 09, 2021. B. 8. Wavelength of green colour is nearly A) 4000 A B) 4500 A C) 5000 A. 5. A. TOP 70 TRANSFORMER OBJECTIVE QUESTIONS AND ANSWERS In this article we are going to discuss about the most 70 electrical machine or energy conversion objective question and answers in the form of MCQ. 2. Option-2 : the required power input is low. The open-circuit test on the transformer is performed to determine magnetizing reactance and equivalent resistance due to iron loss. The aim of this test is to determine the no-load losses i.e., core loss at rated voltage. C. friction losses. MCQs of Transformers. Answer: A. Clarification: Open circuit test is conducted on l.v. During open circuit test of a transformer (a) primary is supplied rated voltage (b) primary is supplied full-load current (c) primary is supplied current at reduced voltage (d) primary is supplied rated kVA. A 2000/200V, 20KVA transformer has 66 turns in the secondary. Hence, a wattmeter will record the iron losses and small copper loss in the primary. This test is always preferred to perform on the low voltage (LV) side of the transformer. The instruments connected to the primary side measures the voltage by a voltmeter, no load current by an ammeter and no-load power by a wattmeter. Preperation Over ! Short Circuit Test on Transformer. This article will helps you to prepare for competitive exam as well as semester exam. Why OC test is performed on LV side? The open circuit test is performed on a transformer to find no-load (or shunt branch) parameters and core loss (or iron loss). ... With the help of Sumpner’s test both the open-circuit and … Then iron losses will be. Option-3 : it is not advisible to work on high voltage side. Kapp’s Regulation. An open circuit posses infinite resistance, while a short circuit posses zero … OA representing V2 is drawn at angle θ2 with I2. (a) 0.005 mm(b) 0.05 mm(c) 0.5 m(d) 5 mThe armature of D.C. generator is laminated to(a) reduce the bulk(b) provide the bulk(c) insulate the core(d) reduce … This article lists 100 Transformer MCQs for engineering students.All Transformer Questions & Answers given below include a hint and wherever possible link to the relevant topic.This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on Transformers topic which is core in Electronics & … In a transformer, the magnetic coupling between the primary and secondary circuit can be increased by. 6. Open circuit test & Short circuit test in transformers 1 Open circuit test. The open circuit test is performed to determine the no load losses or core losses as well as the turns ratio, no load currents, magnetizing components and ... 2 Short Circuit test. ... 3 Calculation of transformer efficiency. ... 4 Sumpner’s test. ... The low power factor wattmeter is the instrument that measures lower values of power factor accurately. 9. Phasor Diagram of Open Circuit Test. In this article, in addition to the tests mentioned in the title, we will also discuss the polarity test and Sumpner’s test.. The description of the construction of the diagram is shown below. Option-4 : sum of hysteresis and eddy current losses. The open-circuit test on a transformer is always made on _____ winding. Sometimes a voltmeter is placed in the open HV side of the Transformer to measure the Secondary voltage to get turn ratio. Basic Electrical Engineering (3110005) MCQs. Question is ⇒ The open-circuit test on a transformer gives, Options are ⇒ (A) equivalent resistance and leakage reactance., (B) magnetizing current and core loss at rated voltage., (C) copper losses., (D) both (b) and (c)., (E) , Leave your comments or Download question paper. Hence low pf wattmeter is used to measure iron losses of transformer. The purpose of the open-circuit test is to determine the no-load current and losses of the transformer because of which their no-load parameter is determined. And the power consumption in these tests is minimal as compared with the transformer's output on full load. Due to this, the analysis by approximate equivalent circuit gives fairly satisfactory results. I = 21.7 A E = 115 V P = 570 W If the same test is performed at 30V, 50Hz, then. In a transformer which test is used for information about regulation, efficiency, and heading under the no-load condition: (A) Short circuit test (B) Open circuit test (C) Back to Back test (D) Hopkins-on test. ELECTRICIAN Trade MCQ also useful for competitive exam like PSU Job exam As well as Government Job Exam, … 342. The core-loss component of current is, approximately? 46. This test is always performed on the rated voltage at the input side of the transformer. ANSWER. Therefore it is seen that the open circuit test on transformer is used to determine core losses in transformer and parameters of the shunt branch of the equivalent circuit of the transformer. While performing a circuit test on transformer at 30v, 30 Hz it gives Φ1 as lagging power factor. 22.7 A C. 45.0 A D. 91 A Ans: (C) To arrest the flow of moisture when the outside air enters the transformer. The voltage rating of the transformer in a pole-mounted Sub Station is.. 9. This open circuit test gives only core loss or … 4. If the thickness of the laminations used in the transformer core are increased. The number of … Power required during the open circuit and short circuit test is? 2 KVA, 230 V, 50 Hz single phase transformer has an eddy current loss of 40 watts. (b) capacitive. The open-circuit test is performed on the transformer. Open Circuit Test on a Transformer: Open circuit test is used to determine the no-load current and losses of the transformer because of which their no-load parameters are determined. In short circuit test, the secondary side of transformer is shorted using an ammeter. It operates on AC voltage and gives step up or step down voltage on output depends on turns ratio. Each question carries 1 point. A single phase transformer of 2000/200 V having rated l.v. Then the results _____ Actually, to achieve synchronous speed in an induction motor is impossible. 2 A transformer performs conversion. (A) To provide oxygen to the cooling oil. The short circuit test is performed for determining the below mention parameter of the transformer. Option-4 : the voltage required is low. No Load Test is an indirect method used for determining the efficiency and also to determine the circuit parameters of the equivalent circuit of the three-phase induction motors. The open-circuit test and the short-circuit test being performed on a transformer to determine the circuit parameters, efficiency and the voltage regulation without actual loaded of the transformer. The standard test requires an open circuit test and short circuit test. This test gives accurate results compared to the taking measurement on a full load transformer. The impedance of armature winding is expressed as Z S = R a + jX S Ω/phase, which is nothing but the synchronous impedance of an alternator and since the drop due to the … The voltmeter, ammeter and the wattmeter readings are taken and suppose they are V0, I0 and W0 respectively. A transformer has negative voltage regulation when its load load power factor is (a) Zero (b) Unity (c) Leading (d) Lagging. Give free Online Examination: Question 11 : Open-circuit test on a transformer gives: Option-1 : hysteresis loss. The open circuit test of the transformer gives information related to: a) magnetizing current b) core loss c) both magnetizing current and core loss d) None of the above 5. (b) square waveform. Method of Short-circuit Test. Clarification: Open circuit test gives the core losses also called as iron losses and shunt parameters of the equivalent circuit of transformer. « Back CONTENTS Next » 1. Option-3 : copper loss. side, so the measuring instruments will be on the h.v. During open circuit test transformer works at very low power factor. A single phase transformer of 2000/200 V having rated l.v. Electrical Machines MCQ – Open Circuit and Short Circuit Test. During short-circuit test, iron losses are negligible because (a) the current on secondary side is negligible (b) the voltage on secondary side does not vary (c) the voltage applied on primary side is low (d) full-load current is not supplied to the transformer. ... Series of Multiple Choice Questions in … The open circuit and the short circuit test gives a very accurate result as compared to the full load test. The low power factor wattmeter is the instrument that measures lower values of power factor accurately. 4 A transformer requires. Copper loss in a transformer occurs in a. core b. winding c. main body d. bushings. 3) While performing a circuit test on transformer at 30v, 30 Hz it gives Φ1 as lagging power factor. 100 Important Multiple choice Question Of Transformer – 2021 ... the reading indicated by the wattmeter connected in the circuit gives the full load copper losses of the transformer. The ammeter reading gives the no load current I0.As no load current (I0) very small,voltage drop due to this current also neglected.The input power supplied to the transformer is indicated by the watt meter (W).Output power of transformer in open circuit test is zero because other side of transformer is open circuited.That means input supply is to just compensate the core losses … Electrical Machines Expected MCQ PDF 10 For Coal India Limited (CIL) MT Exam 2017. watts respectively. side will be around 3-6% of the rated. The invention of a practical efficient transformer made AC power distribution feasible; a system using distribution transformers … As the name suggest no load test is performed when rotor rotates with synchronous speed and there is no load torque.
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