UNIT I
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 II
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 & Variable Losses – Calculation of Efficiency – Swinburne‘s Test.
UNIT-III
SINGLE PHASE TRANSFORMERS: Single Phase Transformers – Constructional DetailsEmf Equation – Operation on No Load and on Load – Phasor Diagrams-Equivalent Circuit –
Losses and Efficiency-Regulation-OC and SC Tests – Sumpner‘s Test – Predetermination of
Efficiency and Regulation.
UNIT IV
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.

UNIT V
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.
OUTCOME: After going through this course the student gets a thorough knowledge on DC
Motors & Generators, Transformers and Induction motors with which he/she can able to
apply the above conceptual things to real-world problems and applications.
TEXT BOOKS:
1. Electric Machines –by I.J.Nagrath & D.P.Kothari,Tata Mc Graw Hill, 7th
Edition.2005
2. Basic Electrical Engineering –By T.K.Nagasarkar and M.S. Sukhija Oxford University
Press.
REFERENCES:
1. Electrical and Electronic Technology, Hughes, Pearson Education.
2. Electrical Machines, P. S. Bimbhra, Khanna Publishers, 2011.
3. Basic Electrical Engineering, 2nd Edition, V.N. Mittle and Aravind Mittal, Mc Graw hill
Education, 2006.