It is used in case of AC supply, where AC is required. 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. The stator carries a 3-phase winding (called stator... [1] How does the Induction motor work? 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. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. one phase is highly overloaded and others are slightly overloaded. 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 … Air gap flux density is of the order of 0.65 - 0.9 T. 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. Three-phase induction motor is mainly suitable for which of the following application. 19. The more we add carbon in steel, the more it becomes harder and stronger. A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. At synchronous speed, the slip is … If single phase occurs in delta connected 3-phase induction motor there will be no electric current in one phase. The domains of power system where directional overcurrent relay is indispensable are . This website uses cookies to improve your experience. 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. And to develop that torque, the motor must have slip. The starting torque of a squirrel-cage induction motor is, Ques 9. 3. If you are looking for Normal Distribution Multiple Choice Questions Pdf And Thre Lesser than the supply ... Slip ring induction motor are employed only for. Practice Test: Question Set - 07 1. It is laminated to reduce eddy-current losses. 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 … Adding silicon to steel increase its resistivity and strength and it is easier to magnetize silicon added steel. two phases are highly overloaded and no electric current in 3 rd phase. there will be no electric current in two phase. f = Pns/2. As we know that the transformer’s efficiency is greater than 95%. The torque developed by an induction motor is proportional to the slip. a) For running different machine tools where several speeds are required b) For running paper machine requiring exact speed control a. The frequency of rotor e.m.f. As in the synchronous motor, applying three-phase currents to the armature creates a synchronously-rotating magnetic field. Three phase voltage supplied to the stator windings produces a rotating magnetic field. ... 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. In an induction motor, no-load the slip is generally, Ques 3. Electrical Engineering Objective Questions MCQ with Answer Free Pdf Download. A double squirrel-cage induction motor has, 100 Most Important 3-phase Induction Motor Explained MCQ. The outer cage bar is made up of high resistive material such as aluminum, brass etc. 11. Induction motors are often compared to Transformers because both the machines work under the principle 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. 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 Find the percentage slip and number of poles of the induction motor. A shaft is a metallic, rotating and oscillating rod that rotates continually to transfer movements or torque in the machine. Starting torque is directly proportional to the rotor resistance of an induction motor. Accept Read More. 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. Which of the following component is usually fabricated out of silicon steel? 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%. B. As the name suggests the double squirrel-cage induction motor has two sets of parallel squirrel-cage winding in the same rotor. (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 must be made up of the rigid material that can absorb vibration as well as noise in the induction 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 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. 1. Three Phase Induction Motor MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and … which will improve your skill. If you searching to check on Scada Multiple Choice Questions And Answers Pdf And Three Phase Induction Motor Multiple Choice Questions Pdf price. We'll assume you're ok with this, but you can opt-out if you wish. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. Lightweight comparable to the solid shaft of the same diameter, Due to low specific mass hollow shafts can tolerant to high-temperature. 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. MCQ or Objective. 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. In order to develop rotating magnetic field the induction motor, it needs 120° phase shift of supply and winding in stator winding. 1. Multiple Choice Question (MCQ) of Induction Motors page-2. Categories Objective Questions; 1. two phases are highly overloaded and no electric current in 3 rd phase. Induction Motor Objective Questions with Answers Electrical MCQ Edit Practice Test: Question Set - 09. The shaft of an induction motor must be of. Recommended Post MCQs on Electrical Circuit Theory For an Induction motor shaft, we need a material with high torsional rigidity as well as material that can take a lot of stress. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. Three phase voltage supplied to the stator windings produces a rotating magnetic field. 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. 1. At full rated load, slip varies from more than 5% for small or special purpose motors. Three-phase induction motor is mainly suitable for which of the following application. The frame of the induction motor is made either of. The three-phase squirrel-cage induction motor can, and many times does, have the same armature (stator) winding as the three-phase synchronous motor. 58. How many types of Induction Motor ? 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. 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