Alibaba manufacturer directory suppliers, manufacturers. 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. A good material for the poles of a pmdc motor should have the apposite of the above. A bar magnet rotates when alternating current flows through the coils. Output torque and speed depends on the electrical input and motor design. Analysis of speed control of series dc motor using diverter and observation of speed saturation point. Dc motor theory summary there are two conditions necessary to produce a force on a. Commissioning of dc generator dc motor electrical engineering mcq questions and answers. These applications include ship propulsion, mine hoists and steel rolling mills. A dizzying array of parameters specify a motor the two motors you have are small directdrive. Noload speed of which of the following motor will be highest. Ac motors the ac electric motors stator has coils that are supplied with the alternating current and produces a rotating magnetic field. Dc motors university of utah college of engineering. In the model, rs is the resistance of the cable leading to the motor.
For explanatory answer, click on the toggle button labeled as check explanatory answer. Most important mcq or objective questions on induction motor are discussed in this page. Olevel classified additional mathematics with model answers. Frequently asked petroleum refinery engineering multiple choice questions and answers pdf. Brushed dc motor fundamentals microchip technology. 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. C, motor below the normal without wastage of electrical energy is used. When installing an overload relay for safety while connecting a dc motor. On what basis is the cut off current level for the overload relay decided assuming it will be higher than 2. The motor unit is selected according to the required output power.
Dc motor mcq, electrical engineering mcq, mcq on dc motor. Applications of the motor, usage of brushes and the maintenance cost of the motor. 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. Ac dc zangenmultimeter mastech ms 2102 adidas performance f5 trx fg g65423 herren fu. Home category electrical engineering mcq questions and answers commissioning of dc generator dc motor. Three phase ac circuits mcqs with explanatory answers. Review and cite brushless dc motors protocol, troubleshooting and other. 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. Field weaking method of a dc motor is also known as a. If the frequency of 3phase supply to the stator of 3phase induction motor is increased, then.
Use sensor for feedback desired speed actual speed test computation motor encoder measurement. Dc motors electrical engineering questions and answers. Motors electrical engineering multiple choice questions and answers. Mining equipment dc motor objective questions answers pdf. Dc machines quiz questions electrician exams practice tests. In the old days, startup and speed was controller with stepped recistance, but now mostly controlled with electronics, pwm, pulse width modulation. Directcurrent motor characteristics and applications, in electric. Questions about material in ac and dc motors video.
Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. 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. Msedcl previous year memory based question paper with. This application note will discuss how a bdc motor works, how to. Hello everyone, this is a brand new session on 30 important mcqs on switchgear and protection. Lines are drawn, parallel to the caf yaxis, from 4 to meet the xaxis at nand from. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Securitycenter digilan network camera tv7230 us227. 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. When current carrying conductor is placed in a magnetic field it. Series field coils consist of which of the following in a dc motor. Expected dc motor objective questions mcq 1 25 electrical engg in hindi. Which of the following motor is used in high speed application. Three phase induction motors mcqs with explanatory answers.
Brushed dc bdc motors are inexpensive, easy to drive, and are readily available in all sizes and shapes. Multiple choice question mcq of electronics page17. It is a machine which convert electrical energy into mechanical energy. The dc motor is the simplest of the motors discussed here. Three phase induction motors mcqs with explanatory answers 1. The bldc motor actually represents the end, or at least the most recent end result, of a long evolution of motor technology.
Pdf link for expected dc motor mcq 125 expected dc generator mcq 125. Module 2 basic dc theory this module describes the basic concepts of direct current dc electrical circuits and discusses the associated terminology. Brushed dc motors are widely used in applications ranging from toys to pushbutton adjustable car seats. Pdf analysis of speed control of series dc motor using. What is common to all the members of this family is that the basic. Dc motor introduction, principle and working my tech info. Im trying to wire up a dc motor to a 9volt battery with a resistor in between, and the motor just wont turn. Its operation is based on the principle that when a current carrying conductor is placed in a. To know more about dc motor problems, below are a few common questions answered by experts. In terms of ac motor operation, the bar magnet can be referred to as what. Dc motor or direct current motor multiple choice questions and answers. This dc motor test contains around 20 questions of multiple choice with 4 options. Dc motors dc motor theory this increase in speed will then proportionately increase the cemf. The system shown in figure 1 is a linear model of the quanser srv02 dc motor with a static inertial load.
A single phase induction motor which has the lowest speed is a universal. Here we are providing dc motor quick revision note,it have following topics with important point 1. Three phase ac circuits mcqs with explanatory answers three phase ac circuits mcqs with explanation. A direct current dc motor is an electric machine that converts electrical energy to mechanical energy. Contrast this behavior against that of a permanent magnet dc motor under the same conditions increased mechanical load, causing counteremf to decrease. 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. Dc machines electrical engineering mcq questions and. Multiple choice questions mcqs on dc motor electrical ride.
Dc motor introduction, principle and working introduction. Dc motors are rarely utilized in normal applications as a result of all electrical supply firms furnish electrical energy but, for special applications like in steel mills, mines and electric traction, its advantageous to convert ac into dc so as to use dc motors. 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. 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. 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. Motors mcq question is the important chapter for a electrical engineering and gate students. 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. These mcqs are very important for preparation of gate, fpsc, nts, kppsc, ppsc and other job tests. The points 41, 4, b2, 7, c and dc, 0 are the four vertices of a parallelogram. You have clicked a page that seems to be very popular. 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. There are two terminals, and when you apply direct current to one terminal and ground the other, the motor spins in one direction. Motor control suppose we wish to use a microprocessor to control a motor or to control the load attached to the motor.
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. Noload speed of which of the following motor is highest. Basic linear model for dc motor with inertial load. The commutation process, types, starting of the motor, a number of terminals. Electrical engineering multiple choice questions and answers. Dc motor or direct current motor multiple choice questions. The ac electric motors rotor rotates inside the electric motors coils and is attached to an output shaft th.
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. It works if i connect the motor directly to the battery, but not with the resistor in between. What are the differences between a dc motor and an ac. A dc motor can be looked upon as a dc generator with the power flow a. Multiple choice questions assertionreason type questions matching type questions truefalse type questions fill in the blanks type questions. 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. C motor electric power components free 30day trial. There is some dc resistance, in this motor maybe 210. Depending on the required speed, a direct motor or a geared motor is.
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