A double squirrelcage 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. An uninteresting single phase synchronous engine is a the repulsion engine b of the allmade engine series ris d. Most important and frequently asked multiple choice questions and answers on single phase induction motor. Single phase induction motors mcqs answers pdf electrical.
Single phase induction motor 25 objective types questions and answer in hindi in electrical engineering in this video we will learn about 25. Out of all ac motors, a three phase induction motor is the most used motor among all motors. How can the direction of rotation of a split phase or capacitorstart induction motor be reversed. What is major difference between a 3 phase induction motor and a single phase induction. Two perpendicular coils that have currents 90outof. A single phase induction motor is inherently not selfstaring can be shown easily. How a single phase motor is similar to 3 phase motor. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Single phase induction motor multiple choice questions. It has only one phase still it makes the rotor to rotate, so it is quite interesting.
An uninteresting single phase synchronous engine is a the repulsion engine b of. Most asked objective questions or mcq on single phase. Design of electrical machines multiple choice questions on single phase induction motor construction. Auxiliary winding starting current connection diagram 4. Because it has more advantages and it is as listed below. In a single phase induction motor, the starting torque developed is proportional to supply voltage supply voltage2 1supply voltage2 1supply voltage 3. Single phase induction motor the single phase motor starting torque is zero because of the pulsating single phase magnetic flux. Single phase induction motors answer the following questions. Working principle of threephase induction motor electrical. Single phase induction motor interview questions part1. There are 5 steps in the construction of the single phase induction motor. Multiple choice questions mcq on single phase motors for electrical engineering.
Single phase induction motors mcqs answers electrical engineering multiple choice questions answers pdf download. The single phase induction motor is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. Free download in pdf single phase induction motor multiple choice questions with answers for competitive exams. The construction of an induction motor is very simple and robust. The most common type of ac motor being used throughout the work today is the induction motor. Single phase induction motors mcqs for preparation of fpsc, nts, kppsc, ppsc, and other test. You have to select the right answer to the question. Hello everyone, this session discusses the top 20 most important mcqs on the topic of induction motor which is useful for every electrical competitive exams.
How many steps are involved in the construction of single phase induction motor. These single phase induction motor questions are very important for. Run capacitor stator winding relay rotary switch rotor start capacitor main or run windin stator winding main winding start capacitor rotor. Home category electrical engineering mcq questions and answers 3 phase induction motors 1 the frequency of the induced emf in an induction motor is a. Single phase induction motor mcq questions and answers page 5. In fact, an induction motor can be treated as a rotating transformer i. The torque developed by a singlephase induction motor at.
February 15, 2020 posted in induction motor comments. That is why such motors are known as induction motors. Why shadedpole single phase induction motor does not need any special starting technique like capacitors and auxiliary winding etc. If a single phase induction motor runs slower than normal, the most likely defect is a worn bearings b shortcircuit in the winding c opencircuit in the winding d none of the above. Single phase induction motor 25 objective types questions and. The single phase motor stator has a laminated iron core with two windings arranged perpendicularly. They are found everywhere from a small workshop to a large manufacturing industry. Hello everyone, this session discusses the top 50 most important mcqs on the topic of induction machines which is useful for every electrical competitive exa.
Applications of three phase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous. These short objective type questions with answers are very. Dear readers, welcome to single phase induction motor interview questions and answers have been designed specially to get you acquainted with the nature of questions you may encounter during your job interview for the subject of single phase induction motor. Multiple choice questions mcq on network theorem 1. Single phase induction motors, electrical engineering multiple choice.
Single phase induction motor mcq questions and answers. Single phase induction motors multiple choice questions and answers pdf free download,interview questions,objective type questions,lab viva manual. Nov 15, 2020 why single phase induction motor is not self starting. Since here we are talking about maintenance of induction motor, and it is of two types. Mcq in ac motors part 5 ree board exam pinoybix engineering. The rotor will constantly be turning to align its magnetic field with that of the stator field. Which of the following motor is suitable for frequent starting and stopping. Single phase induction motor objective type question answer in. If rotor power output of 3 phase induction motor is 15 kw, then rotor copper losses at a slip of 4% will be. Single phase induction motor multiple choice questions mcq and. What are the advantages and disadvantages of induction motors. The singlephase stator winding produces a magnetic field that pulsates in strength in a sinusoidal manner. Single excited machine b double excited machine c machine in which three phase supply is fed to both stator and rotor.
It is simple and rugged in construction it is relatively cheap induction motors. The synchronous engine can only operate when a lagging power ratio b leading power ratio only c unity power ratio only d lag, lead and power unity factor only. A single phase induction motor is very similar to a 3 phase squirrel cage induction motor. Top 50 induction motor mcq single phase three phase. The construction of the poles is such that they give a sweep to the magnetic flux and motor starts rotating. Best single phase induction motor interview questions and answers. Three phase induction motor is mainly suitable for which of the following application.
Single phase induction motors mcqs for preparation pakmcqs. Compare capacitor start and capacitor run motor with respect to i starting torque, ii power factor at rated speed. The 3 phase set of currents, each of equal magnitude and with a phase. There are two basic reasons for the use of single phase motors rather than 3 phase motors. Single phase induction motors electrical engineering questions. Single phase induction motors multiple choice questions. Mcq on single phase induction motor your electrical guide. Nov 01, 2016 quiz of daybasic general knowledge electrical 1 important expected objective questions and answer pdf for vizag mt exam 2017 online mcq computer awareness 16. Squirrel cage induction motor requires significantly less maintenance as it does not contain brushes, commutators, slip rings. Home category electrical engineering mcq questions and answers 3 phase induction motors. Most asked objective questions or mcq on single phase motors.
It has i a squirrelcage rotor identical to a 3 phase motor ii a single phase winding on the stator. Single phase induction motor double revolving field theory the three phase induction motor starting torque inversely depends on the slip this implies that a small positive slip 0. If a single phase induction motor runs slower than normal, the most likely defect is a worn bearings. Shaded pole motor hysteresis motor reluctance motor universal motor 2. The starting torque of a squirrelcage induction motor is low negligible same as the fullload torque slightly more than fullload torque 3. Single phase induction motor multiple choice questions with. Although single phase induction motor is more simple in construction and is cheaper than a 3 phase induction motor of the same frame size, it is less efficient and it operates at lower power factor. Single phase induction motor the single phase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth.
If a single phase induction motor runs slower than normal, the most likely defect is a worn bearings b shortcircuit in the winding. Induction motor mcq questions with answers electrical. Three phase induction motor is mainly suitable for which of the following application a for running different machine tools where several speeds are required b for running paper machine requiring exact speed control c for running electric vehicles d for running rolling mills needing exact speed control. Single phase induction motors mcq set 02 objectivebooks. If the capacitor of a single phase motor is shortcircuited the motor will not start the motor will. These short objective type questions with answers are very important for board exams as well as competitive exams. A 6pole, 3 phase,60 hz induction motor runs at rpm developing maximum torque. The starting of the motor requires the generation of a rotating magnetic flux similar to the rotating flux in a three phase motor. Single phase induction motors questions and answers. 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.
Before that, we need to know why a single phase induction motor is not a selfstarting motor and how we overcome the problem. The basic idea of an electric motor is to generate two magnetic fields. Single phase induction motor mcq in 3 phase induction motor questions and answers pdf in hindi, mcq single, objective, quiz, important. Single phase induction motor multiple choice questions mcq. The field produces by the single phase induction motor can be explained by doublerevolving field theory the basic idea behind the double field revolving theory is that any alternating quantity can be resolved into 2 equal components rotating components of the same strength which is revolving at the same speed but in opposite directions. Sep 02, 2014 starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a a magnetic relay b thermal relay c centrifugal switch d none of the above ans. In capacitor start single phase motors current in the starting winding leads the voltage current in the starting winding lags the voltage current in the starting winding is in phase with voltage in running winding none of the above answer.
Below is the single phase induction motors mcq test that checks your basic knowledge of single phase induction motors. This single phase induction motors mcq test contains 20 multiple choice questions. These short solved questions or quizzes are provided by gkseries. It is advisable to avoid line starting of induction motor and use starter because. Computer science multiple choice questions and answers. Single phase induction motor multiple choice questions with answers for competitive exams. Apr 16, 2020 the ac motors are more useful in industrial applications. In a split phase motor, the running winding should have. Practicing all single phase induction motors electrical engineering questions and answers in online helps you to improve your ability to attend the real time. Why single phase induction motor does not self starts.
Connect both windings in parallel, terminals 1 to 3 and 2 to 5, as. Oct 28, 2020 so the main idea behind motor maintenance is to prevent breakdown rather than repairs them. In a split phase motor, the running winding should have a high resistance and low inductance b low resistance and high inductance. B it is preferred to permanentsplit singlevalue capacitor motor where frequent reversals are required. Finally, you can also take the online quiz from the take single phase induction motors.
1228 623 1286 98 1498 950 950 113 199 1403 339 1357 950 1338 181 965 1065 826 802 619 913 404 635 676 32 1033 1067 1163 80 1385