3 phase induction motor multiple choice questions 3 phase induction motor multiple choice questions and answers 3 phase induction motor objective questions 3 phase induction motor objective questions answers 3 phase induction motor questions and answers 3 phase induction motor questions and answers pdf 3 phase induction motor short questions control speed of Wound Rotor Motors DC Series Motor … 2.A 3-phase 440 V, 50 Hz induction motor has 4% slip. will be (A) 200 Hz (B) 50 Hz (C) 2 Hz (D) 0.2 Hz. The torque developed by a 3-phase induction motor depends on the following three factors: (a) speed, frequency, number of poles (b) voltage, current and stator impedance (c) synchronous speed, rotor speed and frequency (d) rotor emf, rotor current and rotor p.f. This website uses cookies to improve your experience. In the squirrel-cage induction motor, the rotor has very low fixed resistance, therefore, the starting torque is low due to low power factor and high reactance. In order to develop rotating magnetic field the induction motor, it needs 120° phase shift of supply and winding in stator winding. The efficiency of an induction motor is about, Ques 10. As in the synchronous motor, applying three-phase currents to the armature creates a synchronously-rotating magnetic field. Explanation: The field produces by the single phase induction motor can be explained by double revolving field theory. which will improve your skill. Multiple Choice Question (MCQ) of Induction Motors page-2. Frequency of the rotor current is given as. If single phase occurs in delta connected 3-phase induction motor there will be no electric current in one phase. If single phase occurs in delta connected 3-phase induction motor there will be no electric current in one phase. The complete circuit diagram of a 3-phase induction motor can be drawn with the help of 3 phase induction motor multiple choice questions 3 phase induction motor multiple choice questions and answers 3 phase induction motor objective questions 3 phase induction motor objective questions answers 3 phase induction motor questions and answers 3 phase induction motor questions and answers pdf 3 phase induction motor short questions control speed of Wound Rotor Motors DC Series Motor … a. At full rated load, slip varies from more than 5% for small or special purpose motors. Correct Answer. ... A 10 HP/7.5 kW, 415 V, 14.5 A, 1460 RPM, 3 phase rated induction motor, after decoupling from the driven equipment, was found to be drawing 3 A at no load. A 3-phase 440 V, 50 Hz induction motor has 4% slip. As in the synchronous motor, applying three-phase currents to the armature creates a synchronously-rotating magnetic field. will be (A) 200 Hz (B) 50 Hz (C) 2 Hz (D) 0.2 Hz. An Induction motor includes friction and windage(i.e., mechanical losses) losses addition to the no load and copper losses, hence efficiency comes down to 80% to 90%. two phases are highly overloaded and no electric current in 3 rd phase. Numerical Problems Induction Motors . Answer 3. The ratio of VA rating of 36 SCR device to that of 18 SCR device is (a) 1/2 (b) 1 (c) 2 (d) 4. (a) It has no external electrical connections to its rotor (b) A three-phase supply is connected to its stator (c) A magnetic flux which alternates is produced The frame of an induction motor is usually made of, Ques 2. 1. 11. Based on type of phase supply Three phase induction motor (self starting in nature) Single phase induction motor (not self starting) Other Squirrel-cage induction motor Slip ring induction motor. At synchronous speed, the slip is … A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Most important MCQ or objective questions on induction motor are discussed in this page. Objective Questions on Single Phase Motors | Part 1. one phase is highly overloaded and others are slightly overloaded. The induction motor rotor is a completely short-circuited conductive cage. one phase is highly overloaded and others are slightly overloaded. MCQ or Objective. Ideal Transformer | Characteristics of Ideal Transformer, Construction of Alternator | Synchronous Generator, Why synchronous motor is not self starting, Methods of starting of Synchronous Machine, UPPCL AE Electrical Engineer Solved Paper 2019, SSC JE electrical question paper 2019 with solution SET-2, 100 Important MCQ Question of DC Motor | Objective type question of DC Motor, 100 Most Important 3-phase Induction Motor MCQ with Explanation | Polyphase induction motor MCQ With Explanation, SSC JE synchronous motor & synchronous generator question. Since slip ring induction motors used to accelerate heavy loads over a  long period of time and to withstand excessive heat phosphorous bronze slip is used. 1. 18. Three phase voltage supplied to the stator windings produces a rotating magnetic field. Lightweight comparable to the solid shaft of the same diameter, Due to  low specific mass hollow shafts can tolerant to high-temperature. In case of parallel feeder protection . there will be no electric current in two phase. Multiple Choice Question (MCQ) of Induction Motors page-6. A shaft is a metallic, rotating and oscillating rod that rotates continually to transfer movements or torque in the machine. PDF link for Expected 3-¢ Induction Motor MCQ 1-25 https://goo.gl/EAJVSr Expected 3-¢ Induction Motor MCQ 1-25 Part-1 https://goo.gl/xuV1FB Efficiency of … For an Induction motor shaft, we need a material with high torsional rigidity as well as material that can take a lot of stress. 1. (a) It has no external electrical connections to its rotor (b) A three-phase supply is connected to its stator (c) A magnetic flux which alternates is produced A three-phase induction motor consists of two parts – Stator (the stationary part) and Rotor (the rotatory part) with the latter being separated from the former by a small air gap. The frame of the induction motor is made either of. A capacitor start single phase induction motor will usually have ... dc series motor (C) 2 phase induction motor (D) 3 phase induction motor. Ques 1. As we know that the transformer’s efficiency is greater than 95%. Multiple Choice Question (MCQ) of Induction Motors page-2. The, Phosphorous bronze provide good electrical conductivity and low thermal conductivity. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Practice Test: Question Set - 07 1. A double squirrel-cage induction motor has two rotors moving in opposite direction two parallel windings in the stator two parallel windings in the rotor two series windings in the stator 2. Find the percentage slip and number of poles of the induction motor. The shaft of an induction motor must be of. As the name suggests the double squirrel-cage induction motor has two sets of parallel squirrel-cage winding in the same rotor. Air gap flux density is of the order of 0.65 - 0.9 T. The frequency of rotor current will be, Ques 8. The three-phase squirrel-cage induction motor can, and many times does, have the same armature (stator) winding as the three-phase synchronous motor. Less than 1% . 60. (a) and (b) both. Shafts transfer movement and torque in machine hence they are subject to torsion and shear stress, therefore they must be strong enough to bear the stress. Three Phase Induction Motor MCQ Questions Answers Electrical Engineering. 19. Which of the following component is usually fabricated out of silicon steel? A 3-phase slip ring motor has (a) double cage rotor (6) wound rotor (c) short-circuited rotor (d) any of the above Ans: b. Slip ring of an induction motor is usually made up of, Ques 7. In squirrel cage motor there is no provision made for adding external resistance because the end rings are permanently shorted with the rotor conductor, therefore, the starting torque of squirrel cage induction motor is very poor due to low rotor resistance. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. The frequency of rotor e.m.f. When the rotor of 3 phase induction motor run at synchronous speed, ... INTERVIEW QUESTIONS. B. Three Phase Induction Motor MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and … a) For running different machine tools where several speeds are required b) For running paper machine requiring exact speed control [11] Three-phase to three-phase cycloconverter employing 18 SCRs and 36 SCRs have the same voltage and current ratings for their component thyristors. Three Phase Induction Motor MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and … Induction motors are often compared to Transformers because both the machines work under the principle of. s = n s – n r /n s where n s = synchronous speed n r = running speed; The torque developed by an induction motor is proportional to the slip. f = Pns/2. a. Three-phase induction motor is mainly suitable for which of the following application. High tolerance to the rotational imbalance due to low weight. 1. The induction motor rotor is a completely short-circuited conductive cage. 59. The three-phase squirrel-cage induction motor can, and many times does, have the same armature (stator) winding as the three-phase synchronous motor. But for the practical motor, there will be some friction and other losses, which motor has to overcome by developing some torque. 1. Multiple Choice Questions (MCQ) on Transmission and Distribution for Electrical Engineering 1. At synchronous speed, the slip is zero and hence torque developed by the motor is zero. Lesser than the supply ... Slip ring induction motor are employed only for. 5. The material is selected based on cost, heat transfer characteristics and manufacturing capability considering the size of the machine. It is advisable to avoid line starting of induction motor and use starter because ... A 3-phase 440 V, 50 Hz induction motor has 4% slip. Accept Read More. A. It is advisable to avoid ... A 3-phase 440 V, 50 Hz induction motor has 4% slip. The torque developed by an induction motor is proportional to the slip. In an induction motor, no-load the slip is generally, Ques 3. The more we add carbon in steel, the more it becomes harder and stronger. The starting torque of a 3-phase squirrel cage induction motor is (a) twice the full load torque (b) 1.5 times the full load torque (c) equal to full load torque Ans: b. Induction Motor Objective Questions with Answers Electrical MCQ Edit Practice Test: Question Set - 09. Three phase voltage supplied to the stator windings produces a rotating magnetic field. What is the relationship between the supply frequency number of poles and sycnchronous speed? The starting torque of a squirrel-cage induction motor is low negligible same as the full-load torque slightly more than full-load torque 3. 3 Phase Induction Motors Related ( MCQ ) Objective Questions with Answers [1] Which of the following statements about a three-phase squirrel-cage induction motor are false? 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It supplies an induction motor ich has a full load speed of 144wh 0 rpm. If a single phase induction motor runs slower than normal, the most likely defect is (a) worn bearings (b) short-circuit in the winding (c) open-circuit in the winding a) For running different machine tools where several speeds are required b) For running paper machine requiring exact speed control How many types of Induction Motor ? Three-phase induction motor is mainly suitable for which of the following application. 3. Objective Type Each question carries One mark 1. there will be no electric current in two phase. Single Phase Induction Motors, Electrical Engineering Multiple Choice Questions / Objective type questions, MCQ's, with question and answers, download free PDF, Electrical Engineering, Multiple Choice Questions, Objective type questions, Electrical Engineering short notes, rapid fire notes, best theory Multiple Choice Questions (MCQ) on Single Phase Motors for Electrical Engineering. Speed control b. What are the advantages and disadvantages of Induction Motors? The upper and lower cage bar is separated by narrow slit or construction. If you are looking for Normal Distribution Multiple Choice Questions Pdf And Thre 3 phase induction motor multiple choice questions 3 phase induction motor multiple choice questions and answers 3 phase induction motor objective questions 3 phase induction motor objective questions answers 3 phase induction motor questions and answers 3 phase induction motor questions and answers pdf 3 phase induction motor short questions control speed of Wound Rotor Motors DC Series Motor … A double squirrel-cage induction motor has two rotors moving in opposite direction two parallel windings in the stator two parallel windings in the rotor two series windings in the stator 2. 51. The outer cage bar is made up of high resistive material such as aluminum, brass etc. MCQ; For large motors, the slip is less than 1%  because an induction motor consists of short circuit rotor winding having small resistance therefore small slip will induce the large current in the rotor which can produce sufficient torque. Categories. In this page you can learn various important single phase induction motor multiple choice questions answers,single phase induction motor mcq,sloved single phase induction motor objective questions answers, single phase induction motor mcq pdf etc. 58. Categories Objective Questions; 1. Answer 1. The inner cage has high leakage flux linkage due to the presence of slit hence it has high self-inductance. Advantages: It is simple and rugged in construction It is relatively cheap Induction motors require less maintenance Induction motor has high... What is the Three Phase induction motor Working Principle? The frame must be made up of the rigid material that can absorb vibration as well as noise in the induction motor. Zero . 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. It is used in case of AC supply, where  AC is required. Phosphor bronze is an alloy of copper, tin, and phosphorus. 3. Electrical Engineering Objective Questions MCQ with Answer Free Pdf Download. Induction Motor Objective Questions with Answers Electrical MCQ Edit Practice Test: Question Set - 09. The starting torque of a squirrel-cage induction motor is, Ques 9. A three-phase induction motor consists of two parts – Stator (the stationary part) and Rotor (the rotatory part) with the latter being separated from the former by a small air gap. 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But at slightly lower speed, which motor has, 100 most important MCQ or Questions... Machines work under the principle of considering the size of the order of 0.65 - 0.9 T. 1 diesel! To steel increase its resistivity and strength and it objective questions on three phase induction motor pdf advisable to avoid... a induction! Case of AC supply, where AC is required stator... [ 1 ] How the. Suggests the double squirrel-cage induction motor copper, tin, and objective questions on three phase induction motor pdf is an alloy of copper,,. Based on cost, heat transfer characteristics and manufacturing capability considering the size of the following is... Of 5 the motor must have slip, rotating and oscillating rod that rotates to... 2 Hz ( B ) 50 Hz induction motor is low negligible same as the full-load torque 3 11... High self-inductance with slip ring, the motor must be of power system where directional relay... 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