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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Physical Science Review Waves‚ Sound and Light Waves- What are Waves? 1. 1 .The substance that a move through is called a medium. 2. True or False: Particles are squeezed together during rarefactions. 3. True or False: Waves that require a medium through which to travel are called electromagnetic waves. 4. True or False: The matter in the medium moves perpendicular to a transverse wave. 5. What medium is often used to transfer computer information? Optic Fibers 6. 6 .A
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nonmagnetic and and is placed in a uniform magnetic field of magnitude B0 . The coil sides are of radius R and are uniformly spaced around the rotor surface. The first coil carrying a current I1 and second coil carrying a current I2 . Assuming that the rotor is 0.30 m long‚ R=0.13 m‚ and B0 = 0.85 T‚ find the Θ directed torque as a function of rotor position α for (a) I1 =0A and I2 =5A‚ (b)I1 =5A and I2 =0A‚ and (c)I1 =8A and I2 =8A. Uniform magnetic field‚ B 0y r θ Ι2 Ι1 R α ι
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Magnetic Resonance Imaging (MRI) is a medical imaging technology that uses strong magnetic fields and radio waves to create graphic images of the body’s anatomical and internal structures (1). MRI relies primarily on the protons in fat and water molecules of the body‚ as these protons respond to the static magnetic field created in ways that allows for a high quality image to be generated (2). These images contrasts specific tissue and different anatomical structures. For example‚ MRI can reveal
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Advanced Placement Program AP® Physics B Practice Exam The questions contained in this AP® Physics B Practice Exam are written to the content specifications of AP Exams for this subject. Taking this practice exam should provide students with an idea of their general areas of strengths and weaknesses in preparing for the actual AP Exam. Because this AP Physics B Practice Exam has never been administered as an operational AP Exam‚ statistical data are not available for calculating potential
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Basic Engineering-II The objective of this subject will help us to know the basic knowledge of Electronics. The concept of semiconductors‚ transistors‚ diodes‚ FET‚ MOSFET their working principles‚ construction and working model. To know about the a.c to dc converting circuits like half wave‚ full wave rectifiers circuits. Also the filter operation of ripples using various types of filter circuits. The various types of transducer working‚ construction and uses will be discussed briefly and moving
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well as power factor compensators (synchronous condensers). •Asynchronous (Induction) Machines: •Induction Motors: Most widely used electrical motors in both domestic and industrial applications. •Induction Generators: Due to lack of a separate field excitation‚ these machines are rarely used as generators. Energy Conversion • Generators convert mechanical energy to electric energy. • Motors convert electric energy to mechanical energy. • The construction of motors and generators are similar
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CGHS Physics Trial HSC Examination 2008 Page 1 Student number ……………………….. Teacher …………………………………….. Cheltenham Girls High School 2008 Higher School Certificate Trial examination Physics TASK WEIGHTING: 35% General Instructions • Reading time – 5 minutes • Working time – 3 hours • Write using black or blue pen • Draw diagrams using pencil • Board-approved calculators may be used • A data-sheet‚ formulae sheets and Periodic Table are provided at the back of this paper Total marks –
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current loop behaves like a magnetic dipole. The magnitude of the magnetic moment‚ associated with a current loop‚ equals the product of the area of the loop and the current flowing through it. Its direction is normal to the plane of the loop and is along the direction of advancement of a right handed screw rotated in the sense of current flow in the loop. It follows that for a current loop of area A‚ carrying an anticlockwise current of magnitude I‚ the equivalent magnetic moment is
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What’s the difference between resistance and resistivity? Resistance is the obstruction offered to the flow of current by a conductor. Resistivity is the obstruction offered to the flow of current by UNIT AREA OF the conductor. So basically‚ resistance is the property of the object (say a copper wire)‚ whereas resistivity is the property of the substance (copper). And so resistance depends upon the properties of the object. Whereas resistivity depends upon the properties of the metal.
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