THE UNIVERSITY OF NEW SOUTH WALES FINAL EXAMINATION JUNE/JULY‚ 2001 ELEC4240/ELEC9240 POWER ELECTRONICS 1. Time allowed: 3 (three) hours 2. This paper has six questions. Answer any four. 3. All questions are of equal value. 4. A separate examination book should be used for each question. 5. Candidates may bring only slide rules‚ drawing instruments and approved electronic calculators into the examination room. 6. Answers must be written in ink. Except where
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machine with poor insulation or hits a live cable‚ then a person becomes conductor‚ and the shock that a person feel is the electrical current going through the body of the person. • Shock can cause : - pain‚burn - loss of muscle control and coordination - Internal bleeding - nerve‚ muscle or tissue damage - cardiac arrest or death. Confidential Slide Fundamentals of Electrical Hazards More than 3 ma painful shock More than 10 ma muscle contraction “no-let-go” danger More than 30 ma lung paralysis-
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or try repairing any electrical equipment or circuits with wet hands. It increases the conductivity of electric current. 2. Never use equipment with frayed cords‚ damaged insulation or broken plugs. 3. If you are working on any receptacle at your home then always turn off the mains. It is also a good idea to put up a sign on the service panel so that nobody turns the main switch ON by accident. 4. Electrical hazards include exposed energized parts and unguarded electrical equipment which may become
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SCHEME OF TEACHING AND EXAMINATION BE (ELECTRICAL ENGINEERING) III Semester Sl.No. Board of Studies Subject Subject Code Periods per week L T P Scheme of Exam Theory/Practical ESE CT TA Total Credit L+(T+P) /2 Marks Appl. Mathematics 324351(14) Mathematics III 3 1 80 20 20 120 4 2 Electrical Engg. 324352(24) Electrical Machines -I 4 1 80 20 20 120 5 1 3 Electrical & Electronics Engg. 324353(25)
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partial fulfillment of requirements for the degree of Bachelor of Technology In Electrical Engineering Guided by Prof. VINEET MEHTA Name of the student: BHOMARAM BHISNOI (10EJIEEOO6) JAGDEV(10EJIEE022) DEPARTMENT OF ELECTRICAL ENGG. JIET JODHPUR(MOGRA) 2013 CERTIFICATE
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CONTENTS 1) INTRODUCTION 2) CIRCUIT DIAGRAM 3) HOW IT WORKS 4) COMPONENETS DESCRIPTION. A. IC 555 TIMER B. BC 547 TRANSISTOR C. RESISTER D. CAPACITOR E. PRESET F. BUZZER G. PCB 5) SCOPE 1) INTRODUCTION: Generally when we are pumping liquids like water or may be any other liquid is we need a human to see whether the tank is filled or not or we will place a overflow pipe to know that the tank is fill or not
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agent for synthetic elastomers. It is used extensively for rapid curing of butyl stocks requiring heat resistance. Butyl of this type is used to fabricate high voltage wire and cable products‚ moulded electric components‚ and heat resistant seals and hose. PQD has also been used as part of the curative system for liquid butyl elastomers. These compounds are formulated as coatings‚ sealants and electrical encapsulants. The proper choice of PQD and a co-curative‚ such as lead dioxide or tertiary-butyl perbenzoate
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electric heater and more. Heating effect of electric current are below (i) Electric iron: In an iron the upper part is grooved. In this groove a coil is placed. Mica as an insulator is placed between the metal part and the coil‚ so that there is no electrical connection between them. Mica is a bad conductor of electricity but it is a good conductor of heat. Due to the flow of current through the coil it becomes heated and the heat transferred to the metal part through mica. Finally the metal part becomes
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INSTRUCTIONAL MANUAL IN ALTERNATING CURRENT CIRCUITS An Instructional Manual Presented to the Faculty of the Graduate School Western Institute of Technology La Paz‚ Iloilo City In partial fulfillment of the Requirements for the Course EGC 600 – RESEARCH by Engr. boysie t. tejada March 2012 INSTRUCTIONAL MANUAL IN ALTERNATING CURRENT CIRCUITS An Instructional Manual Presented to the Faculty of the Graduate School Western Institute of Technology La Paz
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there is a need to change voltage‚ current of frequency of electric power. The power range of these converters is forming some mill watts (as in mobile phone) to thousands of megawatts in an HVDC transmission system. With classical electronics‚ electrical currents‚ and voltage are used to carry information‚ where as with power electronics‚ they carry power electronics becomes the efficiency An inverter converts DC to AC‚ and also changes voltages. In other words‚ it is a power adopter. It allows
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