Module 2: D.C. Machines: Working principle, construction and methods of excitation. Armature Winding: Introduction of simplex lap and wave windings. DC generators: EMF equation – methods of excitation – separately and self-excited – shunt, series, compound - armature reaction – effects of armature reaction - demagnetizing & cross magnetizing ampere-turns – compensating windings – inter poles
D.C. Motors: Principle of operation – back EMF – classification – torque equation – losses and efficiency – power flow diagram –performance characteristics of shunt, series and compound motors – starting of DC motors – necessity and types of starters – speed control – methods of speed control
Module -3 : Transformers: Principle, construction and operation of single phase transformers, phasor diagram, equivalent circuit, voltage regulation, losses and efficiency, Testing- Open & short circuit tests, Polarity test, Sumpner’s test, Separation of hysteresis and eddy current losses,
D.C. Motors: Principle of operation – back EMF – classification – torque equation – losses and efficiency – power flow diagram –performance characteristics of shunt, series and compound motors – starting of DC motors – necessity and types of starters – speed control – methods of speed control
Module -3 : Transformers: Principle, construction and operation of single phase transformers, phasor diagram, equivalent circuit, voltage regulation, losses and efficiency, Testing- Open & short circuit tests, Polarity test, Sumpner’s test, Separation of hysteresis and eddy current losses,
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