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Note for Basic Electrical Engineering - BEE By vtu rangers

  • Basic Electrical Engineering - BEE
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  • Visvesvaraya Technological University Regional Center - VTU
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Basic Electrical Engineering 15ELE15 Module – 2 2a. D.C. Machines: Working principle of D.C.Machine as a generator and a motor. Types and constructional features. Types of armature windings, Emf equation of generator, relation between induced emf and terminal voltage with an enumeration of brush contact drop and drop due to armature reaction. Illustrative examples, neglecting armature reaction. Operation of D.C. motor, back emf and its significance, torque equation. Types of D.C. motors, characteristics and applications. Necessity of a starter for D.C. motor. Illustrative examples on back emf and torque. 7 Hours 2b. Measuring Instruments: Construction and Principle of operation of dynamometer type wattmeter and single phase induction type energy meter. 3 Hours Module – 3 3a.Single-phase A.C. Circuits : Generation of sinusoidal voltage, frequency of generated voltage, definition and numerical values of average value, root mean square value, form factor and peak factor of sinusoidally varying voltage and current, phasor representation of alternating quantities. Analysis, with phasor diagrams, of R, L, C, R-L, R-C and R-L-C circuits and, parallel and series- parallel circuits. Real power, reactive power, apparent power and power factor. Illustrative examples. 7 Hours 3b. Domestic Wiring: Service mains, meter board and distribution board. Brief discussion on concealed conduit wiring. Two-way and three-way control. Elementary discussion on Circuit protective devices: fuse and Miniature Circuit Breaker (MCB’s). Electric shock, precautions against shock–Earthing, Earth leakage circuit breaker (ELCB) and Residual current circuit breaker (RCCB). 3 Hours Module – 4 4a. Three Phase Circuits : Necessity and advantages of three phase systems, generation of three phase power. Definition of Phase sequence, balanced supply and balanced load. Relationship between line and phase values of balanced star and delta connections. Power in balanced threephase circuits, measurement of power by two-wattmeter method. Determination power factor using wattmeter readings. Illustrative examples. Department of EEE, SJBIT 6 Hours Page 2

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Basic Electrical Engineering 15ELE15 4b. Three Phase Synchronous Generators: Principle of operation, Types and constructional features, Advantages of rotating field type alternator, Synchronous speed, Frequency of generated voltage,Emf equation. Concept of winding factor (excluding the derivation of distribution and pitch factors). Illustrative examples on emf equation. 4 Hours Module – 5 5a. Single Phase Transformers: Necessity of transformer, Principle of operation and construction of single-phase transformers (core and shell types). Emf equation, losses, variation losses with respect to load, efficiency, Condition for maximum efficiency, Voltage regulation and its significance (Open Circuit and Short circuit tests, equivalent circuit and phasor diagrams are excluded). Illustrative problems on emf equation and efficiency only. 6 Hours 5b. Three Phase Induction Motors: Principle of operation, Concept and production of rotating magnetic field, Synchronous speed, rotor speed, Slip, Frequency of the rotor induced emf, Types and Constructional features. Slip and its significance. Applications of squirrel - cage and slip – ring motors. Necessity of a starter, starting of motor using stars-delta starter. Illustrative examples on slip calculations. 4 Hours TEXT BOOKS 1 “Basic Electrical Engineering”, D C Kulshreshtha, TMH, 2009 Edition. 2 “Fundamentals of Electrical Engineering”, Rajendra Prasad, PHI, Second Edition, 2009. REFERENCE BOOKS: 1. "Electrical Technology", E. Hughes International Students 9th Edition, Pearson, 2005. 2. “Basic Electrical Engineering”, Abhijit Chakrabarti, Sudiptanath, Chandan Kumar Chanda, TMH, First reprint 2009. 3. Problems in Electrical Engineering, Parker Smith, CBS Publishers and Distributors, 9th Edition, 2003. Department of EEE, SJBIT Page 3

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Basic Electrical Engineering 15ELE15 CONTENTS Sl. No TOPICS PAGE NO. Module-1: 1a) DC Circuits 1. 5-19 1b) Electromagnetism Module-2: 2 a) D.C. Machines 2. 20-36 2 b) Measuring Instruments Module-3 3a) Single-phase A.C. Circuits 3. 37-88 3 b) Domestic Wiring Module-4 4 a) Three Phase Circuits 4. 89-106 4 b) Three Phase Synchronous Generators Module-5 5 a) Single Phase Transformers 5. 107-134 5 b) Three Phase Induction Motors Department of EEE, SJBIT Page 4

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Basic Electrical Engineering 15ELE15 MODULE – 1 1. D. C. Circuits Ohm’s Law: the current flowing through the electric the electric circuit is directly proportional to the potential difference across the circuit and inversely proportional to the resistance of the circuit, provided the temperature remains constant. The limitations of the Ohm’s law are, 1) It is not applicable to the nonlinear devices such as diodes, zener diodes, voltage regulators ect. 2) It does not hold good for non-metallic conductors such as silicon carbide. The law for such conductors is given by, V = K Im where k, m are constants. (I) Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps. (E) Voltage Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere is the difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit, and is measured in (V) volts. (R) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in ohms. Department of EEE, SJBIT Page 5

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