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? 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. 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%. This website uses cookies to improve your experience. When the rotor of 3 phase induction motor run at synchronous speed, ... INTERVIEW QUESTIONS. Three Phase Induction Motor MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and … 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. With slip ring, the voltage in the external circuit varies like a sine wave and the current alternates the direction. Numerical Problems Induction Motors . 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. 11. In case of ring main feeder protection Categories Objective Questions; 1. 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. Three Phase Induction Motor MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and … The stator core is made of silicon because it possesses high magnetic permeability and low magnetic hysteresis. 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The upper and lower cage bar is separated by narrow slit or construction. which will improve your skill. The full-load slip of a 3-phase induction motor ranges from ... RTU Date Sheet 2020 Download Semester Exam Date PDF; Bastar University Result 2020 bvvjdp.ac.in BA BSc BCom Part 1 2 3; For an Induction motor shaft, we need a material with high torsional rigidity as well as material that can take a lot of stress. As in the synchronous motor, applying three-phase currents to the armature creates a synchronously-rotating magnetic field. A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. Starting torque is directly proportional to the rotor resistance of an induction motor. (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 stator carries a 3-phase winding (called stator... [1] How does the Induction motor work? a. Steel is a mixture of iron and carbon. two phases are highly overloaded and no electric current in 3 rd phase. The material is selected based on cost, heat transfer characteristics and manufacturing capability considering the size of the machine. As the name suggests the double squirrel-cage induction motor has two sets of parallel squirrel-cage winding in the same rotor. If you are looking for Normal Distribution Multiple Choice Questions Pdf And Thre The induction motor rotor is a completely short-circuited conductive cage. Three phase voltage supplied to the stator windings produces a rotating magnetic field. Lesser than the supply ... Slip ring induction motor are employed only for. The frequency of rotor current will be, Ques 8. As in the synchronous motor, applying three-phase currents to the armature creates a synchronously-rotating magnetic field. 2.A 3-phase 440 V, 50 Hz induction motor has 4% slip. Explanation: The field produces by the single phase induction motor can be explained by double revolving field theory. Categories. a) For running different machine tools where several speeds are required b) For running paper machine requiring exact speed control one phase is highly overloaded and others are slightly overloaded. Zero . As we know that the transformer’s efficiency is greater than 95%. Which of the following component is usually fabricated out of silicon steel? A shaft is a metallic, rotating and oscillating rod that rotates continually to transfer movements or torque in the machine. In an induction motor, no-load the slip is generally, Ques 3. Find the percentage slip and number of poles of the induction motor. a. If single phase occurs in delta connected 3-phase induction motor there will be no electric current in one phase. Like any electric motor, a 3-phase induction motor has a stator and rotor. The induction motor rotor is a completely short-circuited conductive cage. Adding silicon to steel increase its resistivity and strength and it is easier to magnetize silicon added steel. 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. The, Phosphorous bronze provide good electrical conductivity and low thermal conductivity. Induction Motor Objective Questions with Answers Electrical MCQ Edit Practice Test: Question Set - 09. Less than 1% . Then the motor (a) will continue running burning its one phase ... Polymer Technology Multiple choice Questions and Answers pdf; Polyphase Induction Motors Online Quiz Questions; 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. Electrical Engineering Objective Questions MCQ with Answer Free Pdf Download. (OR) Why does the Rotor rotate? 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. Three Phase Induction Motor MCQ Questions Answers Electrical Engineering. Ques 6. MCQ; How many types of Induction Motor ? The frequency of rotor e.m.f. 17. A. What are the advantages and disadvantages of Induction Motors? Objective Type Each question carries One mark 1. Multiple Choice Questions (MCQ) on Single Phase Motors for Electrical Engineering. Speed control b. Answer 3. At synchronous speed, the slip is zero and hence torque developed by the motor is zero. The shaft of an induction motor is made of, Ques 4. The frame of the induction motor is made either of. At full rated load, slip varies from more than 5% for small or special purpose motors. 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. Explanation: Slip, s, is defined as the difference between synchronous speed and operating speed, at the same frequency, expressed in rpm, or in percentage or ratio of synchronous speed. In case of parallel feeder protection . 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 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. Three-phase induction motor is mainly suitable for which of the following application. The resistance of squirrel-cage induction motor can not be varied as compared to the slip ring induction motor. 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. 51. When a three phase induction motor - connected to a single phase power supply using the Steinmetz connection - operates in a practical no-load condition, not all windings consume active power. The efficiency of an induction motor is about, Ques 10. 1. 1.The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type star connected only delta connected only (a) and (b) both none of the above. We'll assume you're ok with this, but you can opt-out if you wish. The shaft of an induction motor must be of. The frequency of rotor e.m.f. 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. Therefore Motor can not run at synchronous speed but at slightly lower 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. The outer cage bar is made up of high resistive material such as aluminum, brass etc. Recommended Post MCQs on Electrical Circuit Theory A capacitor start single phase induction motor will usually have ... dc series motor (C) 2 phase induction motor (D) 3 phase induction motor. In order to develop rotating magnetic field the induction motor, it needs 120° phase shift of supply and winding in stator winding. Three phase voltage supplied to the stator windings produces a rotating magnetic field. 1. 1. Practice Test: Question Set - 07 1. The three-phase squirrel-cage induction motor can, and many times does, have the same armature (stator) winding as the three-phase synchronous motor. Ques 1. 3-phase-induction-motor-mcq, 3 Phase Induction Motor Objective type question answer one phase is highly overloaded and others are slightly overloaded. High tolerance to the rotational imbalance due to low weight. 1. 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. Ques 5. If you searching to check on Scada Multiple Choice Questions And Answers Pdf And Three Phase Induction Motor Multiple Choice Questions Pdf price. It is advisable to avoid ... A 3-phase 440 V, 50 Hz induction motor has 4% slip. The starting torque could be increased by increasing starting resistance but due to high current in the rotor during starting will increase the copper loss which will decrease the motor efficiency. It is laminated to reduce eddy-current losses. The starting torque of a squirrel-cage induction motor is, Ques 9. A double squirrel-cage induction motor has, 100 Most Important 3-phase Induction Motor Explained MCQ. 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. The torque developed by an induction motor is proportional to the slip. Therefore during starting period, it gave high resistance means high starting torque whereas it gives low resistance during running condition. Slip ring of an induction motor is usually made up of, Ques 7. Three-phase induction motor is mainly suitable for which of the following application. 3 - Phase Induction Motors ... Home >> Category >> Electrical Engineering (MCQ) questions and answers >> 3 - Phase Induction Motors; 1) The frequency of the induced emf in an induction motor is. Accept Read More. What is the relationship between the supply frequency number of poles and sycnchronous speed? A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Greater than the supply frequency b. Air gap flux density is of the order of 0.65 - 0.9 T. 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. (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 Frequency of the rotor current is given as. 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 … 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? A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. At synchronous speed, the slip is … Lightweight comparable to the solid shaft of the same diameter, Due to  low specific mass hollow shafts can tolerant to high-temperature. Most important MCQ or objective questions on induction motor are discussed in this page. 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 … [11] Three-phase to three-phase cycloconverter employing 18 SCRs and 36 SCRs have the same voltage and current ratings for their component thyristors. 1. But for the practical motor, there will be some friction and other losses, which motor has to overcome by developing some torque. The three-phase squirrel-cage induction motor can, and many times does, have the same armature (stator) winding as the three-phase synchronous motor. f = Pns/2. ... 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. Induction motors are often compared to Transformers because both the machines work under the principle of. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. Multiple Choice Question (MCQ) of Induction Motors page-2. The domains of power system where directional overcurrent relay is indispensable are . 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 The frame must be made up of the rigid material that can absorb vibration as well as noise in the induction motor. 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. 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 … 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. 11. 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. 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? 3. two phases are highly overloaded and no electric current in 3 rd phase. 3. It is used in case of AC supply, where  AC is required. Multiple Choice Question (MCQ) of Induction Motors page-2. Induction Motor Objective Questions with Answers Electrical MCQ Edit Practice Test: Question Set - 09. The frame provides the structural support for all other motor components. B. The starting torque of a three-phase induction motor can be increased by (a) increasing slip (b) increasing current (c) both (a) and (b) (d) none of the above . will be (A) 200 Hz (B) 50 Hz (C) 2 Hz (D) 0.2 Hz. Multiple Choice Question (MCQ) of Induction Motors page-6. 5. 19. 60. 1. Phosphor bronze is an alloy of copper, tin, and phosphorus. will be (A) 200 Hz (B) 50 Hz (C) 2 Hz (D) 0.2 Hz. And to develop that torque, the motor must have slip. If single phase occurs in delta connected 3-phase induction motor there will be no electric current in one phase. The inner cage has high leakage flux linkage due to the presence of slit hence it has high self-inductance. (a) and (b) both. Correct Answer. a) For running different machine tools where several speeds are required b) For running paper machine requiring exact speed control 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 … 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. Answer 1. The frame of an induction motor is usually made of, Ques 2. 58. 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 complete circuit diagram of a 3-phase induction motor can be drawn with the help of 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. MCQ or Objective. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. 18. Correct Answer. Objective Questions on Single Phase Motors | Part 1. there will be no electric current in two phase. MULTIPLE CHOICE QUESTIONS ON THREE PHASE INDUCTION MOTOR. 1. A 3-phase 440 V, 50 Hz induction motor has 4% slip. 59. 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INTERVIEW Questions advantages disadvantages!, tin, and phosphorus its fuses blows out alternator is coupled to rotating. The armature creates a synchronously-rotating magnetic field and low magnetic hysteresis Refrigeration and Air-Conditioning Set... Answer Free Pdf Download develop rotating magnetic field three-phase induction motor work Motors page-2 often., it needs 120° phase shift of supply and winding in stator winding for. Is of the induction motor, it gave high resistance means high starting torque is directly proportional to stator., 3 phase induction motor are employed only for proportional to the stator a... Thermal conductivity Distribution for Electrical Engineering objective questions on three phase induction motor pdf applying three-phase currents to the stator a...... INTERVIEW Questions phase shift of supply and winding in stator winding be explained double... Add carbon in steel, the slip is zero and hence torque developed by an induction motor is usually out. 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Core is made of silicon because it possesses high magnetic permeability and low thermal.... Load speed of 144wh 0 rpm 3 rd phase type Question Answer Multiple Choice and... In steel, the slip we add carbon in steel, the motor mainly... From more than full-load torque slightly more than full-load torque 3 gives low resistance during running.! Than 95 % 0.2 Hz there will be no electric current in one phase is highly overloaded and others slightly! And number of poles and sycnchronous speed it gave high resistance means high starting torque whereas gives... Allows the transmission of power and Electrical signals from a stationary to a diesel engine running at 500 rpm resistivity...
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