Dc motors university of utah college of engineering. The bldc motor actually represents the end, or at least the most recent end result, of a long evolution of motor technology. Electrical engineering multiple choice questions and answers. It is a machine which convert electrical energy into mechanical energy. Here we are providing dc motor quick revision note,it have following topics with important point 1. If the frequency of 3phase supply to the stator of 3phase induction motor is increased, then. When current carrying conductor is placed in a magnetic field it. Dc motor introduction, principle and working my tech info.
Dc machines electrical engineering mcq questions and answers home category electrical engineering mcq questions and answers dc machines 1 if e b is the back emf of d. The speed and cemf will continue to increase until the armature current and torque are reduced to values just large enough to supply the load at a new constant speed. Ford motor company ford, we or our filed a quarterly report on form 10qa for the quarter ended june 30, 2006 form 10qa report with the securities and exchange commission sec on november 17, 2006. Volume 2 of 4 module 3 dc circuits this module introduces the rules associated with the reactive components of inductance and capacitance and how they affect dc circuits. The points 41, 4, b2, 7, c and dc, 0 are the four vertices of a parallelogram. The motor unit is selected according to the required output power. Dc motor or direct current motor multiple choice questions and answers. Dc motor or direct current motor multiple choice questions. Frequently asked petroleum refinery engineering multiple choice questions and answers pdf. A dc motor can be looked upon as a dc generator with the power flow a. There are two terminals, and when you apply direct current to one terminal and ground the other, the motor spins in one direction. The ac electric motors rotor rotates inside the electric motors coils and is attached to an output shaft th.
Dc motor introduction, principle and working introduction. Lines are drawn, parallel to the caf yaxis, from 4 to meet the xaxis at nand from. In terms of ac motor operation, the bar magnet can be referred to as what. Three phase ac circuits mcqs with explanatory answers three phase ac circuits mcqs with explanation. Dc machines quiz questions electrician exams practice tests. Series field coils consist of which of the following in a dc motor.
To know more about dc motor problems, below are a few common questions answered by experts. Motors mcq question is the important chapter for a electrical engineering and gate students. The power mentioned on the name plate of an electric motor indicates a the power drawn in kw b the power drawn in kva c the gross power d the output power available at the shaft ans. A good material for the poles of a pmdc motor should have the apposite of the above. Noload speed of which of the following motor will be highest. What is common to all the members of this family is that the basic. The motors do this through the use of magnetic fields that arise from the electric currents to spur rotation of a rotor fixed with an output shaft. What are the differences between a dc motor and an ac. 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. Output torque and speed depends on the electrical input and motor design. Expected dc motor objective questions mcq 1 25 electrical engg in hindi. Contrast this behavior against that of a permanent magnet dc motor under the same conditions increased mechanical load, causing counteremf to decrease. Three phase induction motors mcqs with explanatory answers 1.
Before there were brushless dc motors there were brushed dc motors, which were brought on in part to replace the less efficient ac induction motors that came before. In the old days, startup and speed was controller with stepped recistance, but now mostly controlled with electronics, pwm, pulse width modulation. Noload speed of which of the following motor is highest. Olevel classified additional mathematics with model answers. Brushed dc motor fundamentals microchip technology. Multiple choice question mcq of electronics page17. In accordance with rule 402 of regulation st, the information in this current report on form 8k, including each of the exhibits listed below, shall not be deemed filed for purposes of section 18 of the securities and exchange act of 1934, as amended the exchange act, or otherwise subject to the liabilities of that section of the exchange act, and shall not be incorporated by reference.
Difference between ac and dc motor the ac motor and the dc motor are differentiated on the various factors like the source or the nature of the power used in the motor. Drawdown group codes funding source codes entitywide project codes summary 44k 44l 44m 44n 44o 44p 44q 44r 44s 44t 44u 44v 44w 44x 44y 44z 450 451 452 453 454 455 456 457. Dc motors dc motor theory this increase in speed will then proportionately increase the cemf. Motors electrical engineering multiple choice questions and answers. The commutation process, types, starting of the motor, a number of terminals. Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three. Module 2 basic dc theory this module describes the basic concepts of direct current dc electrical circuits and discusses the associated terminology. Depending on the required speed, a direct motor or a geared motor is. When installing an overload relay for safety while connecting a dc motor. A fourpower agreement can create a new world credit system,a to the seventh annual session of the world public forum dialogue of civilizations oct. Ac motors the ac electric motors stator has coils that are supplied with the alternating current and produces a rotating magnetic field. Hello everyone, this is a brand new session on 30 important mcqs on switchgear and protection. Home category electrical engineering mcq questions and answers commissioning of dc generator dc motor. C motor electric power components free 30day trial.
Field weaking method of a dc motor is also known as a. This dc motor test contains around 20 questions of multiple choice with 4 options. Which of the following motor is used in high speed application. Msedcl previous year memory based question paper with. Review and cite brushless dc motors protocol, troubleshooting and other. Most important mcq or objective questions on induction motor are discussed in this page. Im trying to wire up a dc motor to a 9volt battery with a resistor in between, and the motor just wont turn.
Multiple choice questions mcqs on dc motor electrical ride. There is some dc resistance, in this motor maybe 210. A dizzying array of parameters specify a motor the two motors you have are small directdrive. Basic linear model for dc motor with inertial load. Pdf link for expected dc motor mcq 125 expected dc generator mcq 125.
These mcqs are very important for preparation of gate, fpsc, nts, kppsc, ppsc and other job tests. Multiple choice questions assertionreason type questions matching type questions truefalse type questions fill in the blanks type questions. Dc motors electrical engineering questions and answers. Brushed dc motors are widely used in applications ranging from toys to pushbutton adjustable car seats. Brushed dc bdc motors are inexpensive, easy to drive, and are readily available in all sizes and shapes.
The dc motor is the simplest of the motors discussed here. You have clicked a page that seems to be very popular. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Practicing all dc motors electrical engineering questions and answers in online helps you to improve your ability to attend the real time gate, ies and bsnl jto exams. These applications include ship propulsion, mine hoists and steel rolling mills. C, motor below the normal without wastage of electrical energy is used.
Dc motor mcq, electrical engineering mcq, mcq on dc motor. It works if i connect the motor directly to the battery, but not with the resistor in between. A single phase induction motor which has the lowest speed is a universal. Analysis of speed control of series dc motor using diverter and observation of speed saturation point. Use sensor for feedback desired speed actual speed test computation motor encoder measurement. On what basis is the cut off current level for the overload relay decided assuming it will be higher than 2. A direct current dc motor is an electric machine that converts electrical energy to mechanical energy.
Its operation is based on the principle that when a current carrying conductor is placed in a. Motor control suppose we wish to use a microprocessor to control a motor or to control the load attached to the motor. Directcurrent motor characteristics and applications, in electric. Dc motor applications tecowestinghouse motor company dc motors are ideally suited to a multitude of industrial and marine applications in which high torque and variable speed are required. This application note will discuss how a bdc motor works, how to. Pdf analysis of speed control of series dc motor using. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Dc machines electrical engineering mcq questions and. Three phase induction motors mcqs with explanatory answers. Mining equipment dc motor objective questions answers pdf. Applications of the motor, usage of brushes and the maintenance cost of the motor.
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