ANS. An electric motor is an electrochemical device that converts electrical energy into mechanical energy. Most electric motors operate through the interaction of magnetic field and current carrying conductors to generate force. Principle of working of Electric Motor. Q2.
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The Electrical Machines 1 Notes Pdf – EM 1 Notes Pdf book starts with the topics covering Electromechanical Energy conversion, Construction & Operation, Generator:Armature reaction, separately excited and self excited generators, Load characteristics of shunt, Principle of operation, Speed control of d.c. Motors, Testing of d.c. machines ...
Mechanical Engineering questions and answers; Question 9 0 / 12 pts In this problem, you will analyze a piece of machinery that converts engine torque into propulsion. The drivetrain of a boat is shown below. The three components of this drivetrain are an engine, a driveshaft, and a propellor.
Practice Problems Review Questions. 11. Generalized Theory of Electrical Machines. 11.1 Introduction 11.2 Convention 11.3 Basic Two-Pole Machine 11.4 Transformer with a Movable Secondary Winding 11.5 Kron's Primitive Machine 11.6 Linear Transformations in Machine 11.7 Three-Phase to Two-Phase (a, b, c To a, b. 0) Transformation 11.8 Rotating ...
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Objective questions and answers or MCQ of Electrical Machines page-21; Recent Post. Multiple Choice Question (MCQ) of Electric Power page-10: 91. An impulse turbine A) operates by initial complete conversion to kinetic energy B) is most suited for low head installations
SOLVED PROBLEMS ON DC MACHINE MAGNETIC CIRCUIT Example.1 Calculate the ampere-turns turns for the air gap of a dc machine given the following data. Gross core length = 40cm, air gap length = 0.5cm, number of ducts = 5, width of duct = 1.0cm, slot pitch = 6.5cm, slot opening = 0.5cm, average value of flux density in the air gap =0.63T.
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Department of Electrical Engineering and Computer Science . 6.685 Electric Machines Problem Set 8 Solutions October 24, 2013 . Problem 1: Torque-Speed as affected by seventh space harmonic This, too, is a bit arti ficial. Seventh harmonic is, of course, the first harmonic that will introduce a …
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PUMPS. 1. What is meant by Pump? A pump is device which converts mechanical energy into hydraulic energy. 2. Define a centrifugal pump. If the mechanical energy is converted into pressure energy by means of centrifugal force cutting on the fluid, the hydraulic machine is called centrifugal pump. 3. Define suction head (hs).
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Practical motors do get torque ripple by the the excentricity of the rotor. Motors without slots do not have cogging torques. 2) Often sine wave emf …
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To determine the voltage-drop, first find the circular mil area of the conductors as shown in Chapter 9, Table 8. Then apply the single-phase voltage-drop formula as follows: VD = 2KID VD = 2 x 12.9 x 80 amps x 200 ft. = 7.84 volts. CM 52,620 CM. Incorrect answer. Please choose another answer.
Mechanical Engineering questions and answers. Extra Problem 3: A thin electrical heating element provides a uniform heat flux (qu) to the outer surface of a duct through which air flows. The duct wall has a thickness of 10 mm and a thermal conductivity of 20 W/m.K. (a) At a particular location the air temperature is 30°C and the convention ...
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The answer uses a concept which I've found to be very helpful in understanding electrical circuits: the idea of points in a circuit being electrically common to each other. Simply put, this means the points are connected together by conductors of negligible resistance.
AC Fundamentals Questions. What is the definition of a generator? A generator is a machine which converts mechanical energy to electrical energy. What is the definition of an alternator? An AC generator is also called an alternator. With a six pole alternator spinning at …
Kd = sin (mβ/2) / msin (β/2) [14] Explain the concept of Electrical Degree. Give the relation between electrical angle and mechanical angle. The angle through which an induced alternating emf travels for mechanical rotation of conductors is called an electrical degree. For 2 pole machine, electrical angle is same as mechanical angle of rotation.
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Electrical Machines Interview Questions and Answers. Q.1. Why harmonic restraint feature is incorporated in transformer protection? Answer: In transformer protection, harmonic restraint feature is incorporated to guard against magnetizing inrush current. Q.2.
Answer (1 of 4): Check this out for textbook 5th edition for solution 4th ...
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Answer : D. Question 9 Arc blast is caused by: (A) Poor contact within electrical wire splices (B) Radio frequency emissions from high-power transmitters (C) Discharge of high electrical current through open air (D) Failure to lock-out and tag-out electrical breakers (E) Ionization of gases near high-voltage electrical conductors. Answer : C ...
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