Unit – I Principles of Electro-mechanical Energy Conversion Introduction. [4-13] Flow of Energy in Electromechanical Devices, Energy in magnetic systems(defining energy & Co-energy) , Singly Excited Systems; determination of mechanical force, mechanical energy, torque equation , Doubly excited Systems Energy stored in magnetic field, electromagnetic torque , Generated emf in machines; torque in machines with cylindrical air gap . Unit – 2 D.C. Machines: [14-22] Construction of DC Machines Armature winding, Emf and torque equation , Armature Reaction ,Commutation , Interpoles and Compensating Windings Performance Characteristics of D.C. generators Unit –3 D.C. Machines (Contd.): [23-34] Performance Characteristics of D.C. motors Starting of D.C. motors ; 3 point and 4 point starters , Speed control of D.C. motors: Field Control , armature control and Voltage Control (Ward Lenonard method); Unit 4 Single Phase Transformer: [35-55] Phasor diagram, efficiency and voltage regulation all day efficiency. Testing of Transformers: O.C. and S.C. tests Sumpner’s test, polarity test. Auto Transformer: Single phase and three phase auto transformers volt-amp, relation, efficiency, merits & demerits and applications Unit –5 Three Phase Transformers: [56-67] Construction, three phase transformer phasor groups their connections, open delta connection, three phase to 2 phase, 6 phase or 12 phase connections, and their applications parallel operation and load sharing of single phase and three phase transformers, excitation phenomenon and harmonics in transformers, three winding transformers.