EE201

 DC MACHINES AND TRANSFORMERS

Principle of Energy conversion – Basic magnetic circuit analysis Faradays law of electromagnetic induction – singly and doubly Excited magnetic field systems – Torque production in rotating machines and general analysis of electro mechanical system


DC Generator – constriction, principle of operation, types – emf equation – Characteristics - commutation - Armature reaction


DC motor – principle of operation, types – Torque equation – Electrical & Mechanical characteristics – starting – speed control – Various testing – Braking


Transformers – construction, principle of operation, types – Equivalent circuit - regulation and efficiency – Auto transformer

Three phase transformer connection-Scott connection – all day efficiency - Sumpner's test - parallel operation of transformers.


1. Nagrath, I.J.and Kothari, D.P.,`Electrical Machines', Tata McGraw Hill Publishing Company Ltd., New Delhi, 2006.
2. Dr. P.S. Bimbhra, „Electrical Machinery, ‟Khanna Publishers, 2007.
3. Vincent Del Toro, „Electrical Engineering Fundamentals', PHI, 2003
4. Parkar Smith, N.N., „Problems in Electrical Engineering‟ CBS Publishers and Distributers, New Delhi,1984.
5. Irving L. Kosow „Electric Machinery and Transformers‟ PHI, New Delhi, 1991.