Power electronics Mid-1 Objective exam 2011 1.When UJT is used for triggering an SCR‚ the wave shape of the voltage obtained from UJT firing circuit is a a) Sine wave (b) saw tooth wave (c)trapezoidal wave (d) Square wave 2. In a thyristor circuit‚ the angle of conduction can be changed by changing (a) anode Voltage (b) Anode Current (c) Forward Current rating (d)gate Current 3. Freewheeling diodes are mainly used for (a) Better utilization factor (b) di/dt protection
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BASIC DIODE ELECTRONICS INTRODUCTION TO DIODES The p-n Junction The p-n junction is a homojunction between a p-type and an n-type semiconductor. It acts as a diode‚ which can serve in electronics as a rectifier‚ logic gate‚ voltage regulator (Zener diode)‚ switching or tuner (varactor diode); and in optoelectronics as a light-emitting diode (LED)‚ laser diode‚ photodetector‚ or solar cell. In a relatively simplified view of semiconductor materials‚ we can envision a semiconductor as having two
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the article – Electronic in ASEAN Several factors make electronics a leading industry in South East Asia: 1. Possibilities of application – greatly impact the growth of economy and society of one particular country 2. The drop in the prices of important hardware Electronic industry is divided into two main category: industrial electronics and consumer electronics. Industrial electronics: 1. Servers 2. Telecommunications 3. Robots Consumer electronics: 1. Radios
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Electronic Records Langemo (1995) describe records as the memory of the organization‚ the raw material for decision making‚ and the basic for legal defensibility. Meanwhile Gagnon (1987) defines records from the functional standpoint when he says all recorded information regardless of media or characteristic‚ made or received and maintained by an organization or institution in pursuance of its legal obligations or in the transaction of business. However‚ Clubb (1991) admits that it was relatively
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____________________________________________________________________________________________________________________ Alternating Current and Direct Current Generator Pedro Portela‚ João Sepúlveda‚ João Sena Esteves Department of Industrial Electronic University of Minho‚ Campus of Azurém‚ 4800-058 Guimarães‚ Portugal delfimpedrosa@gmail.com‚ sena@dei.uminho.pt Abstract. Spinning a wire loop within a uniform magnetic field in a convenient fashion induces a voltage between the loop terminals
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journalism Online journalism are immediate and electronic copies available on the Internet‚ it is read by navigation software Online journalism can be published in real time‚ updating breaking news and events as they happen. Nothing new here -- we have had this ability with telegraph‚ teletype‚ radio‚ and TV. Just as we gather around the TV or radio‚ so we can gather and attend real-time events online in chat rooms Online journalism also takes advantage of shifted time. Online publications can publish
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What is New Media? Vin Crosbie‚ 1998 (revised to include world usage figures and Napster example‚ 2002 Only its simplicity makes its difficult to understand. To work successfully in New Media‚ you must understand what the New Media are. There is a saying about Einstein’s Theory of Relativity — that what makes it difficult for some people to comprehend is its simplicity. That you don’t need to acquire more information to understand it‚ but that you must instead discard preconceived notions
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relationships with customers that are relying on Samsung as a partner in the development of specific memory and speed characteristics leading to important cost and time reductions for customers in their development process. Measuring this monetary advantage might provide a better insight that in this high tech environment the direct price of Samsung´s product might not be the most important factor. Customers seek to work with Samsung in projects where they need support in the development of special
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report examines the need for Hong Kong Electronic Industries Association (HKEIA) to provide assistance for local electrical small and medium enterprises (SMEs) to enter the Southeast Asian Market. Background of the project In the past few years‚ Hong Kong’s electronic industry has been facing intense competition from nearby countries‚ such as China‚ Taiwan‚ Singapore and South Korea. Many local SMEs failed to stand in this highly competitive business environment and end up being shut down.
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player‚ newspaper map etc. Television: Television is a system for converting visual images (with sound) into electrical signals‚ transmitting them by radio or other means‚ and displaying them electronically on a screen. Computer: Computer is an electronic device which is capable of receiving information (data) in a particular form and of performing a sequence of operations in accordance with a predetermined but variable set of procedural instructions (program) to produce a result in the form of information
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