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If they are connected in series and 600V be Electrical Engineering Basics applied across them, the readings are Objective Questions with Answers: (a) 360V and 240V Part-17 (b) 300V each (c) 400V and 200V DC Machine Multiple Choice Questions with Solutions: Part-12 (d) one of the meters out of the range and other 100V 3 Phase Induction Motors ...

DC Motor Questions and Answers pdf. 1. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is. 2. The armature voltage control of D.C. motor provides. Answer: (a) constant torque drive. 3. The speed of a D.C…

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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. Here are the types of questions on electric motors which are asked in an interview, question papers and other competitive exams as well.

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DC Machines-Introduction, Constructional Features: Download: 19: DC Machines- EMF and Torque Equations & Generator Operation: Download: 20: DC Machines- OCC & Load Charactristics Classification: Download: 21: DC Machines - Armature Reaction: Download: 22: DC Machines - Voltage Build-up and Load Characteristics: Download: 23

Electrical Machine - DC Motor Objectives: Part 7. [1] The basic requirement of a dc armature winding is that it must be. (a) A closed one. (b) A lap winding. (c) A wave winding. (d) Either b or c. (e) None of the above. Ans: A. [2] The sole purpose of a commutator in a dc generator is to.

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Multiple Choice Question (MCQ) of D.C. Machines page-9. ≪ Previous Next ≫. 81. If the back emf of a dc motor suddenly vanishes. a) The motor will run faster. b) The motor will start hunting the efficiency of the motor will increase. c) The motor will start hunting. d) The motor will burn out.

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Electrical machines by ps bimbhra pdf free download: The main objective of this book is to provide the student with the lucid and comprehensive treatments of transformers with more common types of rotating electrical machines. It focuses on emphasizing the understanding of basic principles underlying the operation of electrical machines.

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DC Machines - Electrical Engineering (MCQ) questions and answers. 1) A 120 V shunt generator running at 850 rpm has its armature and shunt field resistance of 0.15 ohm and 50 ohm respectively. It supplies 200 lamps each rated at 60 W, 100 V. The friction and windage and core loss of the machine is 400 W. its armature copper loss on full load ...

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Ans: (a) 339. If a d.c. motor for 45°C ambient temperature is to be used for 55°C ambient temperature, then the motor. a) Is to be derated by a factor recommended by manufacturer and select next higher HP motor. b) Can be used for 55°C ambient also. c) Of lower …

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For any dc. machine whether it is a generator or a motor, its efficiency is important It should work efficiently. This means that the losses must be as small as possible in d.c machines. The losses will determine the heating of the machine and hence the rating or power output that can be obtained without insulation failure.

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Multiple Choice Questions Test DC Motors - Set 08 MCQ DC Motors Edit Practice Test: Question Set - 08 . 1. ... (B) Low starting torque (C) Variable speed (D) Frequent on-off cycles. Correct Answer. 2. In D.C. machines the residual magnetism is of the order of (A) 2 to 3 percent (B) 10 to 15 percent (C) 20 to 25 percent (D) 50 to 75 percent ...

DC Circuits • Resistance Review • Following the potential around a circuit • Multiloop Circuits • RC Circuits Homework for tomorrow: Chapter 27 Questions 1, 3, 5 Chapter 27 Problems 7, 19, 49 WileyPlus assignment: Chapters 26, 27 Homework for today: Read Chapters 26, 27 Chapter 26 Questions 1, 3, 10 Chapter 26 Problems 1, 17, 35, 77

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A DC machine is an electromechanical energy alteration device. The working principle of a DC machine is when electric current flows through a coil within a magnetic field, and then the magnetic force generates a torque that rotates the dc motor. The DC machines are classified into two types such as DC generator as well as DC motor.

DC Motor or Direct Current Motor Multiple Choice Questions and Answers. 1. The armature of DC machine is made up of laminated sheets to ..... A. Reduce hysterisis loss . B. Reduce the eddy-current loss. C. Reduce armature copper loss. D. Increase dissipation of heat from the armature surface.

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Engg Multiple Choice Questions. DC MACHINES. Q.The speed of a d. c series motor at no load is. a) Zero. b) Infinity. c) Q00 r. p. m. Ans. b. Q.A sinusoidal voltage of frequency 1 Hz is applied to the field of a d.c generator. The armature voltage will be.