INTRODUCTION Tachogenerator is an electromechanical device which generates an electrical output directly proportional to the speed of the rotating systems. Tachogenerators are basically transducers. This transducer converts the speed of rotation directly into electrical signal. The angular speed is converted into a directly dependent voltage signals. The voltage thus generated is fed to a speedometer for speed measurement and /or used as a feedback signal for controlling the speed of a rotating
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Lab# 1 The Node-Voltage Method of Circuit Analysis By: Abstract This report used KCL and Ohm’s law to calculate the node voltages and compare them to the measured node voltages after building the circuit. The calculations were obtained by hand using node analysis. The experiment was simulated on PSpice and the results were verified to hand calculations. The circuit was built in the lab and the results were measured with a digital multi-meter and compared to the calculated values‚ and
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regulator From Wikipedia‚ the free encyclopedia Schematic of a low-dropout regulator A low-dropout or LDO regulator is a DC linear voltage regulator which can operate with a very small input–output differentialvoltage.[1] The advantages of a low dropout voltage include a lower minimum operating voltage‚ higher efficiency operation and lower heat dissipation.[2] The main components are a power FET and a differential amplifier (error amplifier). One input of the differential amplifier monitors
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direction at all points in time‚ although the instantaneous magnitude of the current might vary. In an alternating current (AC)‚ the flow of charge carriers reverses direction periodically. The number of complete AC cycles per second is the frequency‚ which is measured in hertz. An example of pure DC is the current produced by an electrochemical cell. The output of a power-supply rectifier‚ prior to filtering‚ is an example of pulsating DC. The output of common utility outlets is AC. Current per unit
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Chapter 3 VOLTAGE SAG/SWELL MITIGATION USING DYNAMIC VOLTAGE RESTORER (DVR) 3.1 Voltage Sag Mitigation Methods Power quality problems cannot be avoided for the consumers (end users) who are directly connected together by the interconnected systems. Therefore‚ consumers must protect themselves from PQ problems with mitigation or power conditioning devices. It is researched by EPRI that 90 % of all power quality problems are voltage sags in the USA and it is assumed that the European power network
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Why use regulated power supplies? The ideal voltage-regulated power supply would have the following features: 1. Zero output impedance at DC and at all frequencies 2. Zero regulation (constant DC output voltage) for a wide range of AC line voltages and over the entire range of load currents that are required by the powered circuitry. 3. Zero power dissipation. 4. Instantaneous recover from changes in line voltage and load current. 5. Overload protection so that normal operation is automatically
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found in the literature. These problems have become one of the major concern‚ especially‚ with the use of power electronics devices which are sensitive to the variation of power supply. Among these problems Voltage Sag & Swell are identified as major concern to the electrical consumers. Voltage Sag is one of the most occurring power quality problems that cause severe problems and losses to industry. With the power systems restructuring and shifting trend towards distributed and dispersed generation
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Smith BIOL 3810-504 Compound Action Potentials Date Performed: 15FEB2011 Date Due: 01MAR2011 Introduction Neurons are the cells that receive and transmit electrical signals (University of North Texas‚ 2010). The ability of the neuron to conduct these impulses is because of an electrochemical voltage across the plasma membrane of that neuron. An action potential is an all or nothing response to a stimulus along a single axon. A compound action potential is a graded response that results
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2012: Homework 3 5-8 (c) Which specific means are different? SAMPLES? WHAT IF WE HAVE MORE THAN TWO 289 5-77 We study an experiment of the tensile strength of a synthetic fiber. It is suspected that (d) Perform residual analysis and model checking. MS F strength is related to the percentage of cotton in the fiber. Five levels of cotton percentage P are ? used‚ and 5-78. An experiment in random order‚ resulting in the data that follow. five replicates are run was run to determine whether four
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1. Electric safety involves controlling 2 main hazards through one hazard is only evident under high voltage and current conditions. List them and describe some ways you can control the hazards. There are two main hazards of electricity are: electrical shock and electrical arcflash/blast. OSHA statistics show that several hundred deaths occur annually as a result of electrical shock. Over one-half of these deaths are the result of contact with low voltage‚ primarily 120-volts. Residential‚ commercial
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