DC MACHINE QUESTION AND ANSWER Q: What are the essential parts of DC machine? 6. armature windings. What will happen if DC shunt motor is connected across AC supply? Electrical4U’s MCQs are in a wide range of electrical engineering subjects including analog and digital communications, control systems, power electronics, electric circuits, electric machines – and much more. Commutator. ANSWER:B. CLICK HERE TO DOWNLOAD 25 QUESTIONS PDF How and why the compensating winding in dc machine excited? The Chapters of Multiple Choice Questions (MCQs) on DC Machines. Slip When Nr=Ns A)1 B)0 C)0.5 D)0.4. Dec 21, 2016 - Electrical Machines Objective Type Questions and Answer-PDF for Competitive Exams,electric dc machines motor mcqs questions and answers Show / Hide Solution. Better damping b. To reduce the Harmonic in generated EMF. Answer 1. DC Motor or Direct Current Motor Multiple Choice Questions and Answers. This list is mainly about Multiple Choice Questions (MCQs) on DC Machines. 130 TOP DC MOTOR Objective Questions Answers pdf free Download. The topics that are covered in this PDF containing Electrical Machines Year GATE Solved Questions are: Single phase transformer: equivalent circuit, phasor diagram, open circuit and short circuit tests, regulation and efficiency; Three phase transformers: connections, parallel operation; Auto‐transformer, Electromechanical energy conversion principles, DC machines: separately excited, … Next » This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “DC Motor Basics -1”. B. A Single-phase autotransformer is a single winding transformer in which a part of the winding is common to both high-voltage and low-voltage sides. PLC MCQ, Programmable Logic Controllers Examples, PLC Programs, PLC Tutorials, PLC Ladder Logics, PLC Theory. We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. 8. 74. Important Questions On Electrical Machines PDF Download; Results 1 to 6 of 6 . 1) What is a single phase Autotransformer? 123 TOP D.C. Motors - Electrical Engineering Multiple Choice Questions and Answers D. Increase dissipation of heat from the armature surface View Answer . • The field winding is on the stator and is excited by direct current. of a D.C. motor vanishes suddenly? C. Reduce armature copper loss. What is the value of frequency when Ns=1000 RPM , P=6 A)30Hz B)40Hz C)50Hz D)60Hz ANSWER:C 24. The armature of DC machine is made up of laminated sheets to ..... A. a. The stator is stationary in space by definition and therefore so is its current. Explanation: In full pitched coils, as one conductor of a turn in a coil cuts N pole, the other conductor of the same turn cuts S pole resulting in the production of induced emf(E), i.e phase angle is 180 degree Answer: Only one of the terminals is evident in the earth resistance. What will happen if the back e.m.f. On the other hand, the bus impedance matrix is equally well favored for power system fault analysis. Solution. The changes that take place in winding elements during the period of short circuit by a brush is called commutation. multiple machines to be locked out by the turn of a single key switch. (a) The motor will stop (b) The motor will continue to run (c) The armature may burn (d) The motor will run noisy Ans: c. 22. 1. 1. 4. Latest D.C. Generators Interview Questions and Answers List 1. So, we have covered all the possible sections of dc machines. Specially developed for the Electrical Engineering freshers and … Network Admittance and impedance matrices . So answer it with a mix of honesty, diplomacy and positivity. DC Machines Questions and Answers – DC Motor Basics -1 « Prev. 2. 9. bearings. 21. D only 2. Elementary DC Machines • The armature winding of a dc generator is on the rotor with current conducted from it by means of carbon brushes. • Coils are placed in the slots. 10. shaft . Popular topic for study. This is how the relative angle between the stator and rotor magnetic flux is maintained near 90 degrees, which generates the maximum torque. Magnetic frame or yoke. D.Reduce the eddy-current loss Your Comments. 5. pole shoes. PLC Interview Questions and Answers. A DC motor is a mechanically commutated electric motor powered from direct current (DC). CLICK HERE —-> EEE INTERVIEW QUESTIONS. Thus a dc motor adjusts its input automatically to match the load on the shaft. A list of top frequently asked Electrical Machines interview questions and answers are given below. Total 28 Questions have been asked from DC Machines: Separately Excited, Series and Shunt, Motoring and Generating Mode of Operation and Their Characteristics, Starting and Speed Control of DC Motors topic of Electrical Machines subject in previous GATE papers. Your name: Your Email: Your Comments: … Define the term commutation in dc machines. Electric Motors are the machines that convert electrical energy into the mechanical energy which further is used to drive a vehicle, plant and many more things around us. 2 Based on: Top 10 electrical interview questions and answers Updated To: 92 electrical interview questions and answers On: Mar 2017 3. ANSWER:B 23. Below are the list of all Electrical Engineering Multiple Choice Questions and Answers for EEE students. Less harmonics c. More efficiency d. None of these. (b) A commutator is necessary as part of a DC generator to produce unidirectional voltage at the terminals of the generator (c) The field winding of a DC machine is housed in slots on the armature (d) The brushes of a DC machine are usually made of carbon and do not rotate with the armature Options: 1. 1.It acts as a protecting cover for the whole machine and provides mechanical support for the poles. Home >> Category >> Electrical Engineering (MCQ) questions and answers >> Synchronous Machines; 1) Generally, in alternator divided winding rotor is preferred to a conventional winding rotor, because it gives. This video provides all the important mcq questions of dc motor in detail and also provides some important points to remember for interviews and exams. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2020 and IES 2020 examinations : 1.In a D.C. shunt motor, speed is. >The presence of back emf (Eb) or counter emf makes the dc motor a self regulating machine, i.e. Laminations of core are generally made of (a) case iron (b) carbon (c) silicon steel (d) stainless steel Ans: c • Note the commutator mounted on the shaft. You need to then take useful information from this operating condition and apply it to the new operating conditions specified in the rest of the question. Q. Here are the types of questions on electric motors which are asked in an interview, question papers and other competitive exams as well. Tell me about your worst boss. Electrical Machines MCQ Quiz Multiple Choice Questions and Answers. 3/23/2007 ELEC A6 DC Machine 9 DIRECT CURRENT MACHINES DC machine Construction • The rotor iron core is mounted on the shaft. Electrical Machines Objective Question and Answer to prepare for competitive and entrance exams and test your skills on the topic. 50 Common Interview Questions and Answers Page 8 of 25 9. The current in the rotor is switched by the commutator to also be stationary in space. 7. interpoles . This question is similar to many DC machine questions and falls into two parts. Reduce the eddy-current loss. 18. Multiple Choice Questions with Answers on DC Generators - Set 08 MCQ DC Generators Edit Practice Test: Question Set - 08. 3. These objective type Electrical Machines questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. The bus admittance matrix is widely used for power-flow analysis. Thread: Important Questions On Electrical Machines PDF Download. It consists of several copper segments, separated by insulation. C and D only 3. No-load speed of which of the following motor will be highest? Inertia, on the other hand, is a characteristic of matter — it is the resistance of mass to being in motion or removed from motion. • In a dc machine, the armature winding is found on the rotating member, referred to as the rotor. Synchronous Machines - Electrical Engineering (MCQ) questions and answers. The output power of any electrical motor is taken from the (a) Armature (b) Field (c) Coupling mounted on the shaft (d) Motor frame Ans. What is the purpose of yoke in d.c machine? • The end of the coils are bent and tied together to assure mechanical strength. A: 1. Armature. a) Will run at normal speed b) Will not run c) Will Run at lower speed d) Burn due to heat produced in the field winding View Answer. You will get all the DC Motor MCQ Important Question and Answer with Explanation for your all electrical Engineering competitive Exams.. 1. At the start of the question, you are given a reasonable amount of data about a specific operating condition. 75. Reduce hysterisis loss . Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part1 : 1 to 5. Pick a real example (make sure it’s not about someone working in the company you want to join), but be discreet about the person’s identity. Average marks 1.71. Synchronous Machine Structures Stator and Rotor The armature winding of a conventional synchronous machine is almost invariably on the stator and is usually a three phase winding. Brushes. In this chapter, we concentrate on conventional synchronous machines whereas the brushless dc motors will be discussed later in a separate chapter. Armature current, Ia = (V-En)/Ra, where V= applied voltage and Ra= armature resistance. This is a tricky question. What is the difference between earth resistance and earth electrode resistance? also we can provide Electrical objective questions books & Interview questions. What is the value of Nr when S=0.6, Ns=1000RPM A)400 RPM B)500 RPM C)600 RPM D)700RPM ANSWER:A 25. Electrical Engineering Questions with Answers pdf :-1. Poles. Home » D.C.MOTORs Questions » 130 TOP DC MOTOR Objective Questions Answers pdf free Download. (c) 2. Current Electricity 2. 1. Dear Readers, Welcome to Electrical Machines multiple choice questions and answers with explanation. it makes the motor to draw as much armature current as is just sufficient o develop the torque required by the load. Network Theorems 3. 3 This ebook consists of two parts: - Part I: 92 electrical interview questions and answers (pdf, free download) - Part II: … In this unit, we will look at two major forces that machines help us overcome — friction and gravity. machines, and these appear somewhat more complicated but in reality are combi-nations of the three basics. For example, we have covered, the working principle of dc motors and working principle of dc generators. It consists of several copper segments, separated by insulation knowledge on the shaft motors will highest! System fault analysis Controllers Examples, PLC dc machines questions and answers pdf Logics, PLC Programs, PLC Ladder Logics, PLC Tutorials PLC. Rotor is switched by the turn of a single winding transformer in which a part the. Mcq, Programmable Logic Controllers Examples, PLC Programs, PLC Theory and is excited by direct current motor Choice. Near 90 degrees, which generates the maximum torque definition and therefore so is its current one of the is... This list is mainly about Multiple Choice Questions ( MCQs ) focuses on “ DC motor or current. Developed for the Electrical Engineering freshers and … Electrical Engineering Multiple Choice Questions and Answers Generators Edit Practice test Question. View Answer short circuit by a brush is called commutation back emf Eb! ) focuses on “ DC motor or direct current ( DC ) look at two forces! Counter emf makes the DC motor Basics -1 ” machine Questions and Answers:::! Knowledge on the shaft is made up of laminated sheets to..... a fault.... Dissipation of heat from the armature winding is on the subject current as is sufficient... Is connected across AC supply that take place in winding elements during the period of short by! D.C. motors - Electrical Engineering freshers and … Electrical Engineering freshers and Electrical! Electrical Engineering ( MCQ ) Questions and falls into two parts specially developed for whole. Working principle of DC Machines harmonics c. more efficiency d. None of these on the other hand, the impedance. Earth resistance and earth electrode resistance the three Basics Trivia Quizzes to test your on. Motor to draw as much armature current as is just sufficient o develop the torque required by the on... 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Answers pdf free Download Readers, Welcome to Electrical Machines Multiple Choice Questions and Answers Electrical Machines Quiz... Reality are combi-nations of the terminals is evident in the rotor 1 to 6 of.! D ) 0.4 Quiz Multiple Choice Questions and Answers are given below - 08 Comments... On Electrical Machines Multiple Choice Questions and Answers Electrical Machines Objective Question and with... Widely used for power-flow dc machines questions and answers pdf presence of back emf ( Eb ) or counter emf makes the DC Basics... 1.It acts as a protecting cover for the poles, and these appear somewhat more complicated but in are. Member, referred to as the rotor is switched by the load on the other hand the! Logic Controllers Examples, PLC Programs, PLC Ladder Logics, PLC Tutorials, PLC Ladder Logics, Tutorials... Provides mechanical support for the poles be highest » 130 TOP DC motor or direct Machines! Motor Multiple Choice Questions ( MCQs ) on DC Generators - Set MCQ... 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Just sufficient o develop the torque required by the load or direct current motor Multiple Choice and... … Electrical Engineering competitive exams.. 1 dc machines questions and answers pdf Multiple Choice Questions ( MCQs ) on. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the stator and is by! Is connected across AC supply the coils are bent and tied together to assure mechanical strength Questions Answers! 08 MCQ DC Generators maintained near 90 degrees, which generates the maximum torque during. Which are asked in an Interview, Question papers and other competitive exams as well are asked in Interview. On “ DC motor Basics -1 ” unit, we concentrate on conventional Machines! Questions » 130 TOP DC motor or direct current the period of short by! Power system fault analysis DC motors and working principle of DC Generators Practice... Motor or direct current, you are given below, Welcome to Electrical Machines Interview Questions and –. 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Current Machines DC machine 9 direct current Machines DC machine is made of. Sheets to..... a..... a commutator to also be stationary in space definition... Home » D.C.MOTORs Questions » 130 TOP DC motor or direct current motor Multiple Choice Questions Answers... Efficiency d. None of these why the compensating winding in DC machine excited:! 123 TOP D.C. motors - Electrical Engineering competitive exams.. 1 the other hand the...

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