Review of principles of operation of dc, induction and synchronous machines. Operating Characteristics of dc and ac machines, Speed control of dc and induction motors. Operating characteristics of power semi-conductor devices, principle of operation of single and three phase ac-dc line commutated converters, introduction to unity power factor converters. Principle of operation dc-dc (buck, boost, buck-boost, cuk, fly-back and forward) converters. Principle of operation single phase and three phase dc-ac converters, PWM techniques.