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SYLLABUS

Unit-1

DC GENERATORS: D.C Generators – Principle of Operation – Constructional Features – E.M.F Equation – Numerical Problems – Methods of Excitation – Separately Excited and Self Excited Generators – Build-Up of E.M.F – Critical Field Resistance and Critical Speed – Load Characteristics of Shunt, Series and Compound Generators – Applications

Unit-2

D.C MOTORS: D.C Motors – Principle of Operation – Back E.M.F – Torque Equation – Characteristics and Application of Shunt, Series and Compound Motors-Speed Control of D.C Motors: Armature Voltage and Field Flux Control Methods. Three Point Starter-Losses – Constant and Variable Losses – Calculation of Efficiency – Swinburne’s Test.

Unit-3

SINGLE PHASE TRANSFORMERS AND THREE PHASE A.C CIRCUITS: Introduction – Single Phase Transformers – Constructional Details – EMF Equation – Operation on No Load and On Load – Phasor Diagrams – Equivalent Circuit – Losses and Efficiency – Regulation – OC and SC Tests – Predetermination of Efficiency and Regulation – Analysis of Balanced Three Phase Circuits – Phase Sequence – Star and Delta Connection – Relation between Line and Phase Voltages and Currents in Balanced Systems – Measurement of Active and Reactive Power in Balanced and Unbalanced Three Phase Systems.

Unit-4

3-PHASE INDUCTION MOTORS: Polyphase Induction Motors – Construction Details of Cage and Wound Rotor Machines – Principle of Operation – Slip-Rotor EMF and Rotor Frequency – Torque Equation-Torque Slip Characteristics – Losses and Efficiency.

Unit-5

SYNCHRONOUS MACHINES: Principle and Constructional Features of Salient Pole and Round Rotor Machines – E.M.F Equation – Voltage Regulation by Synchronous Impedance Method – Theory of Operation of Synchronous Motor.