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Question 9 DC generators will act as DC motors if connected to a DC power source and not spun at a sufficient speed. This is a problem in DC power systems, as the generator will act as a load, drawing energy from the battery, when the engine or other "prime mover" device stops moving.
contact usDC 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 ...
contact usAnswer : Dc series is in the used in trains to get high starting torque while starting of the trains and the operating voltage is 1500v dc. Electronic Circuits Interview Questions ; Question 6. Explain Different Methods Of Speed Control Of D.c Shunt Motors? Answer : Speed control of a d.c shunt motor can be done using: Flux control method ()
contact usElectrical Engineering Q&A Library A 8 pole, DC generator has a simplex wave wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm.
contact us· Ans: d. 45. Compensating windings are used in D.C. generators. (a) mainly to reduce the eddy currents by providing local short-circuits. (b) to provide path for the circulation of cooling air. (c) to neutralise the cross-magnetising effect of the armature reaction. (d) none of the above.
contact usFollowing Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations : 1 D.C. generators the pole shoes are fastened to …
contact usOBJECTIVE QUESTIONS (ALTERNATOR) by Manoj. 0. 1. Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated for by the. a] governor and speed drop setting.
contact usFollowing D.C. generator will be in a position to build up without any residualmagnetism in the poles. series generator. shunt generator. compound generator. self-excited generator. Answer-75. Post-Your-Explanation-75. 76. D.C. generator generally preferred for charging automobile batteries is.
contact usEngineering interview questions,multiple choice objective type questions,seminor topics,lab viva and answers,online quiz test pdf free download,faqs mcqs. ... A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be (a) zero ... Multiple Choice Questions and Answers on Tunnel Engineering;
contact usA. Dc series is in the used in trains to get high starting torque while starting of the trains and the operating voltage is 1500v dc. Q. Explain different methods of speed control of d.c shunt motors? A. Speed control of a d.c shunt motor can be done using 1. Flux control method 2. …
contact usQ 1. In D.C. generators, the cause of rapid brush wear may be (A) Severe sparking (B) Rough commutator surface (C) Imperfect contact (D) Any of the above Answer: Option D Q 2. The insulating material used between the commutator segments is normally (A) Graphite (B) Paper (C) Mica (D) Insulating varnish Answer: Option C Q 3. Eddy currents are induced in the pole shoes of a D.C. …
contact usHow can an ac generator be converted to a dc generator? Explain your answer. Answer. Check back soon! View Answer. Topics. Electromagnetic Induction. Inductance. Holt Physics. ... Watch More Solved Questions in Chapter 20. Problem 16. Problem 22. Problem 23. Problem 24. Problem 25. Problem 26. Problem 27. Problem 28. Problem 29. Problem 30 ...
contact usThe emf equation of the DC generator is given by the equation: (E_g=frac{Pphi ZN}{60 A}) where. Z is the total number of armature conductor. P is the number of poles in a generator. A is the number of parallel lanes within the armature. N is the rotation of …
contact us· Take DC Generator MCQ Quiz & Online Test to Test your knowledge. We have listed below the best DC Generator MCQ Questions that check your basic knowledge of DC Generator.This DC Generator MCQ Test contains 25 best multiple choices questions.You have to select the right answer to every question.
contact usThe answer is to use a series dropping resistor: Calculate the necessary resistance value and minimum power rating of a series dropping resistor for an LED rated at 1.7 volts and 20 mA, and a power supply voltage of 24 volts. R dropping = 1115 Ω, with a power rating …
contact us· Best D.C GENERATOR Multiple choice Questions and Answers. Dear Readers, Welcome to D.C GENERATOR Objective Questions have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of D.C GENERATOR MCQs.These objective type D.C GENERATOR Questions are very important for …
contact us· What are the conditions to be fulfilled by for a dc shunt generator to build back emf? The generator should have residual flux, the field winding should be connected in such a manner that the flux setup by field in same direction as residual flux, the field resistance should be less than critical field resistance, load circuit resistance should ...
contact us· AC voltages can be easily transformed to higher or lower voltage levels, while it is difficult to do in the case of DC voltages. The maintenance cost for AC transmission is lower than the DC transmission. In the DC System, the speed control range is greater than the AC System. There is low insulation needed in the DC system (about 70%).
contact us· The generator used is a small permanent magnet synchronous generator. I have a question regarding the Torque Speed curve. I have taken …
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contact us· MCQ Test-01 on DC Machines. • Total duration of the test is 25 Minutes. • Types of questions will be numerical/theoretical having multiple choice, fill in the blanks, Multiple correct option, match the following types. • Some Question having more than one correct option,so tick all correct answers. • There is no negative marking.
contact us60. D.C. generator generally preferred for charging automobile batteries is (a) series generator (b) shunt generator (c) long shunt compound generator (d) any of''the above Ans: c. D.C. GENERATORS Objective Questions Pdf :: 61. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when (a) r.p.m. is more ...
contact usA. A d.c. generator whose field magnet winding is supplied from an independent external d.c. source (e.g., a battery etc.) is called a separately excited generator. Q. How do you define Self Excited Generators? A. A d.c. generator whose field magnet winding is supplied current from the output of the generator itself is called a self-excited ...
contact usObjective: Explain the operation of generator Procedures: 1. Analyse the given information and answer the guide questions 2. Write letter only for your answer in your activity answer sheet Description Analysis An induced current is produces in an electric current is produced in an electric generator by rotating a wound coil (called armature) in a stationary magnetic field 1.
contact usThe above figure shows a typical no-load saturation curve or open circuit characteristics for all types of DC generators. 2. Internal or Total Characteristic (E/I a) An internal characteristic curve shows the relation between the on-load generated emf (Eg) and the armature current (I a).The on-load generated emf Eg is always less than E 0 due to the armature reaction.
contact us· Take DC Motor MCQ Test & Online Quiz to test your Knowledge. Below is the DC Motor MCQ test that checks your basic knowledge of DC Motor.This DC Motor MCQ Test contains 20 Multiple Choice Questions.You have to select the right answer to the question. Finally, you can also take the Online Quiz from the Take DC Motor Quiz Button.
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contact usDC Generator MCQ Questions and Answers Quiz. 1. In a four-pole D.C. machine. 2. In over compounded generator, full load terminal voltage is. 3. Armature coil is short circuited by brushes when it lies. 4. Lap winding is composed of.
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