1. INTRODUCTION 1.1) INTRODUCTION OF 3 PHASE INDUCTION MOTOR: The three phase induction motors are used in many industrial applications due to their reliability‚ low cost and high performance. Whereas this popular ac motor performance is affected by following type of faults. 1. ELECTRICALLY RELATED FAULTS (33%): The faults under this classification are single phasing‚ over/under voltage‚ overload over temperature. 2. MECHANICAL RELATED FAULTS (32%): The rotor winding failure‚ stator winding failure
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NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2008 PHYSICAL SCIENCES: PAPER I Time: 3 hours PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 1. This paper consists of: • a question paper of 17 pages • a data and formula booklet of 3 pages (i – iii) Please make sure that your question paper is complete. 2. 3. 4. 5. 6. Remove the pages of data and formulae from the middle of this question paper. Use the data and formulae whenever necessary. Read the questions carefully. In Question 1 answer 1
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PART A: 1. Press the On/Off button to turn on the MeasureNet workstation 2. Press Main Menu‚ then press F2 Temperature‚ next press F1 Temperature vs. Time. 3. Half fill a 150-mL beaker with ice and water. Press calibrate to calibrate the temperature probe. When prompted‚ enter 0.0 *C as the actual temperature of the constant temperature bath (ice water). Press Enter. Insert the temperature probe in the ice water. Swirl the temperature probe until the temperature approaches and stabilizes
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- - Name: - Teacher: - Scientists: Ernest Orlando Lawrence Andre-Marie Ampere Subject: Physics Class: 12A Due Date: 20th August 2012 Name: - Teacher: - Scientists: Ernest Orlando Lawrence Andre-Marie Ampere Subject: Physics Class: 12A Due Date: 20th August 2012 Physics ERT: Magnetism Physics ERT: Magnetism Table of Contents Table
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design for Portable Charger‚ however we are trying to promote our inductor to be used in the input IC charger as well. With the usage of the inductor in input‚ charging time of the battery can be improved. Our inductor is also able to sustain the magnetic field from the current flowing through providing extra energy capacity and stability in current discharge. Usage for inductor in P.Charger - Based on teardown for Romoss powerbank design‚ there are 2 area that our inductors can be used. 1) Output
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Basic Electronics Chapter 2 Basic Electrical Principles and the Functions of Components Figures in this course book are reproduced with the permission of the American Radio Relay League. This booklet was compiled by John P. Cross AB5OX PHYS 401 Physics of Ham Radio 25 Basic Electrical Principles • Conductors - keep loose grip on their electrons and allow electrons to move freely. Metals are usually good conductors. • Insulators - keep close hold of their electrons and do not
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Project #15: Make Homemade Glue from Milk With milk‚ white vinegar and baking soda‚ you can make your own glue right at home. Make it an investigatory project by changing up the recipe and testing which results in the strongest glue. You could also try varying the ingredients to make it dry faster‚ or work on different materials (wood vs. plastic vs. paper). Image via wonderhowto.com A.) --WATER FLOW IN PLANT: Can water travel through plant stems? MATERIALS: graduated one
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push pins. I curled the magnet wire around the battery so that it was in a coil shape‚ then pulled the ends out so that it had tails. Then‚ I used sandpaper to manipulate the clear coating on the ends of the magnetic wire. The paperclips were bent so that they supported the tails of the magnetic wire‚ or “armature arms”. I had to use small pliers‚ an extra material‚ to accomplish this. I used an old textbook as a support base to conduct the rest of the experiment with. The paperclip stands were fastened
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object within a straight line‚ then the forces will reinforce or cancel one another depending of factors such as magnitude and direction. Unbalanced forces will cause changes in the direction or speed of an object. Electromagnetism is composed of magnetic fields and electric currents. The electromagnetic spectrum is mediated by a particle called photon. Example: heat‚ visible light‚ radio waves‚ X-rays‚ UV radiation.
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experiment which showed that there was a connection between electricity and magnetism. * When a current was switched on through a wire‚ it made a compass needle turn so that it was at right angles to the wire. * The current had produced a magnetic field strong enough to cause the compass needle to turn. Additional effects due to experiment * It was already known that an electric current in a wire has a heating effect‚ and may cause the wire to glow. This showed that the three phenomena
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