| Summary, etc. |
D.C. Circuit Analysis and Network Theorems Circuit concepts : Concepts of network, Active and passive elements, Voltage and current sources, Concept of linearity and linear network, Unilateral and bilateral elements, R, L and C as linear elements, Source transformation. Kirchhoffs laws ; Loop and nodal methods of analysis; Star-delta transformation; Network theorems: Superposition theorem, Thevenins theorem, Nortons theorem, Maximum power transfer theorem (simple numerical problems). Steady- State Analysis of Single Phase A.C. Circuits A.C. fundamentals: Sinusoidal, Square and triangular waveforms average and effective values, Form and peak factors, Concept of phasors, Phasor representation of sinusoidally varying voltage and current. Analysis of series, parallel and series-parallel RLC circuits: apparent, Active & reactive powers, Power factor, Causes and problems of low power factor, Power factor improvement; Resonance in series and parallel circuits, Bandwidth and quality factor (simple numerical problems). Three Phase A.C. Circuits Three phase system-its necessity and advantages, Meaning of phase sequence, Star and delta connections, Balanced supply and balanced load, Line and phase voltage/current relations, Three-phase power and its measurement (simple numerical problems). Measuring Instruments Types of instruments, Construction and working principles of PMMC and moving iron type voltmeters & ammeters, Single phase dynamometer wattmeter and induction type energymeter, Use of shunts and multipliers (simple numerical problems on energymeter, Shunts and multipliers). Introduction to Power System General layout of electrical power system and functions of its elements, Standard transmission and distribution voltages, Concept of grid (elementary treatment only). Magnetic Circuit Magnetic circuit concepts, Analogy between electric & magnetic circuits, Magnetic circuits with D.C. and A.C. excitations, Magnetic leakage, B-H curve, Hysteresis and eddy current losses, Magnetic circuit calculations, Mutual coupling. Single Phase Transformer Principle of operation, Construction, e.m.f. equation, Equivalent circuit, Power losses, Efficiency (Simple numerical problems), Introduction to autotransformer. Electrical Machines Principles of electromechanical energy conversion. D.C. Machines : Types, e. m. f. equation of generator and torque equation of motor, Characteristics and applications of d.c. motors (simple numerical problems). Three Phase Induction Motor : Types, Principle of operation, Slip-torque characteristics, Applications (numerical problems related to slip only). Single Phase Induction Motor : Principle of operation and introduction to methods of starting, Applications. Three Phase Synchronous Machines : Principle of operation of alternator and synchronous motor and their applications. |
