Conversion Tutorial 4 – DC Machine 1. Describe operation of DC machine (motor and generator) using illustrations. Specifically explain the purpose of: a. brushes d. armature winding b. split ring commutators e. effect of back emf (in operation) c. field winding 2. Draw the different configurations of DC machines a. shunt c. separately excited b. series 3. Develop‚ using Kirchhoff’s laws‚ equation for Ea (armature voltage) in both motoring and generating mode. 4. Describe three (3) methods of speed control
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“The Machine” The computer age has certainly changed everyone’s lives. The majority of people have joined their selves to machines for better and for worse in many cases‚ it has become the only acceptable way to communicate. According to “The Machine stops” short story written by E.M Forster‚ the lives of individuals are controlled by a machine that works under the surface of the earth. We are in a logic forced into agreement to gain knowledge of computers; otherwise opportunities will continue
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Title: Trurl’s Machine Author: Stanislaw Lem As a boy Stanislaw Lem showed an early interest in science as well as in the imaginary worlds of fantasy and science fiction. The young Lem’s interest in tinkering mechanical devices of all sorts was put to use by secretly damaging the German vehicles during the Nazi occupation. Later on‚ he became a full time writer establishing himself as leading science fiction writer in Eastern Europe. This writer from Lvov Poland (now Ukraine) worked on serious
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Political Machines Political Machines are an organized group that controls a political party in a city. They would offer services to voters and businesses in exchange for political and financial support. Political Machines arose when Europeans‚ farmers‚ and African Americans from the south moved to cities. Urbanization led to new challenges for city government‚ there were demands in city services such as a fire department‚ police‚ sewage‚ transportation and water. Political Machines had a negative
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Special electric machines have a large field of application and actual requirements for electromechanical systems clam new and very performing solutions. There are a lot of papers on this subject‚ but anytime is mandatory to do something else to help users to develop high level systems. Main intention of the authors for this paper is to present a modality to analyze and to design a new solution of electric machine only trough finite element method. Actually‚ the users are asking for very performing
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1. Envelope machine FCI is deciding on whether to buy a machine that makes envelopes for their cards. The cost of envelopes is one of FCI’s largest cost components. Referring to Ms. Beaumont’s estimations the project would generate $218 000 increase in profit after taxes every year during its eight year economic life. Cost of acquiring the machine is 500‚000. If we suppose that FCI is able to convince banks to loan $500‚000 to invest in the envelope machine‚ we can first use FCI’s normal interest
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the Civil War the domination of the "political machine" over the affairs of government in the urban cities of the north became an undisputed fact of local politics. Their power flowed from creating a form of government that sought to perpetuate the position of its leaders by engaging in a bartering process with voters. The political machine existed during a time of mass migration to our urban centers from both immigrants and those in search of work. It played upon the ethnic composition of the new
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Vending Machines Thesis Statement: By looking at studies of in-school vending machines you can see that they are becoming a true problem. This is important because vending machines are lowering education standards and are contributing to the obesity epidemic. Introduction “Can I go to the vending machine?” This is common questions teachers are asked everyday in the class room. In-school vending machines have shown to be a problem for years now. Food sold out of school vending machines should
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Jocasta – one woman‚ two characters ‘The Infernal machine’ by Jean Cocteau is based on the Greek tragedy ‘Oedipus the King’ by Sophocles. This play is a modern adaptation‚ almost in the form of a farce‚ of the Greek tragedy. The main plot of the play is exactly the same as that of Sophocles’ play‚ but Jean Cocteau has added a new style or touch to the story‚ through which he has attempted to turn it into a comedy. The character of Jocasta‚ who was the wife and mother of Oedipus‚ is the most prominent
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Machine Stops Draft 24 March 2010 The Machine Stop’s published in 1909 by E. M Forster is an amazing prediction of a future where humans live below the surface of the earth in “The Machine.”Connected by something similar to the internet and communicating only by webcam‚ their every need is met and physical contact has become obsolete. There is a lot in this story that can be compared with our lives now in regards to dependence on technology and the way that it controls our lives‚ I am going to
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