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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parameter estimation. REGRESSION ANALYSIS Although there are several techniques for estimating parameters‚ the values of the parameters are often obtained by using a technique called regression analysis. Regression analysis uses data on economic variables to determine a mathematical equation that describes the relation between the economic variables. Regression analysis involves both: 1. the estimation of parameter values and 2. testing for statistical significance
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Electronic Revolution "The world is very different now. For man holds in his mortal hands the power to abolish all forms of human poverty‚ and all forms of human life." - John Fitzgerald Kennedy As scientists continue to piece together nature ’s mysteries of science‚ and as technology is becoming the dominating force in numerous areas worldwide‚ there is often a crucial piece of the puzzle that goes missing: responsibility. Though many people praise the abundant benefits of modern
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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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(UniMAP) School of Communication and Computer Engineering Perlis‚ Malaysia R. Badlishah Ahmad University Malaysia Perlis (UniMAP) School of Communication and Computer Engineering Perlis‚ Malaysia Osamah M. Al-Qershi School of Electrical & Electronic Engineering University of Science Malaysia (USM) Penang‚ Malaysia Abstract Steganography is one of the methods used for the hidden exchange of information and it can be defined as the study of invisible communication that usually deals with the
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inside in a shadowy cold room with their eyes glued to a television with scenes of gory video games of people shooting each other’s heads off. Family dinner talks turn into family members scattered throughout the house entranced in their own little electronic world. The over-use of technology is creating an impatient society and it is also diminishing once-valued personal interaction with others. More often now these days‚ people would rather let a machine take a message instead of answering a call;
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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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solution Identification of viable solution towards doing the capstone project Software/hardware specifications identification 4 Design Phase Presentation of the complete prototype (physical plan) Database structure‚ analysis of data anomalies 5 Development Phase Database construction or content management Computer-aided design for the implementation of the prototype Actual coding and unit testing 6 Setting the Libraries 1 Design‚ coding and
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w w ap eP m e tr .X w om .c s er SYLLABUS Cambridge IGCSE® Cambridge International Certificate* Chemistry 0620 For examination in June and November 2014 *This syllabus is accredited for use in England‚ Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate. University of Cambridge International Examinations retains the copyright on all its publications. Registered Centres are permitted to copy material from this booklet for their
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Q1. Samsung Electronics strategy has successfully achieved both low-cost advantages and differentiated products. Samsung is able to achieve and maintain its low cost position due to various factors. Samsung has always emphasized on process and production efficiency. The company places all its fab lines and R&D facility at a single site‚ so that engineers from various departments can come together to resolve any process or design issues as soon as possible. Benefiting from the collocation‚ Samsung
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