UNIT-I:
SINGLE PHASE TRANSFORMERS
Single Phase Transformers, Constructional Details, Types, Hystersis and Eddy Current
Losses, Emf Equation, Operation on No Load and on Load, Phasor Diagrams, Equivalent
Circuit, Losses and Efficiency, Regulation. All Day Efficiency, Effect of Variations of
Frequency & Supply Voltage on Iron Losses.
UNIT-II:
PERFORMANCE OF SINGLE PHASE TRANSFORMERS
OC and SC Tests, Sumpner‘s Test, Predetermination of Efficiency and Regulation,
Separation of Losses Test, Parallel Operation with Equal and Unequal Voltage Ratios, Auto
Transformers, Equivalent Circuit, Comparison with Two Winding Transformers.

UNIT-III:
THREE PHASE TRANSFORMERS AND INDUCTION MOTORS
Three Phase Transformers, Connections, Y/Y, Y/Δ, Δ/Y, Δ/Δ and Open Δ, Third Harmonics
in Phase Voltages, Three Winding Transformers, Tertiary Windings, Scott Connection.
Polyphase Induction Motors, Construction Details of Cage and Wound Rotor Machines,
Production of a Rotating Magnetic Field, Principle of Operation, Rotor Emf and Rotor
Frequency, Rotor Reactance, Rotor Current and Pf at Standstill and During Operation.
UNIT-IV:
3-PHASE INDUCTION MOTOR CHARACTERISTICS
Rotor Power Input, Rotor Copper Loss and Mechanical Power Developed and Their Inter
Relation, Torque Equation, Deduction From Torque Equation, Expressions for Maximum
Torque and Starting Torque, Torque Slip Characteristic, Generator Operation, Double Cage
and Deep Bar Rotors, Equivalent Circuit, Phasor Diagram, Crawling and Cogging, Circle
Diagram, No Load and Blocked Rotor Tests, Predetermination of Performance.
UNIT-V:
STARTING AND SPEED CONTROL OF INDUCTION MOTORS
Starting Methods and Starting Current and Torque Calculations, Speed Control, Change of
Frequency, Pole Changing and Methods of Consequent Poles, Cascade Connection, Injection
of an EMF induction generator, principle of operation
TEXT BOOKS:
1. Electrical Machinery & Transformers by Irving Kosow –Pearson Publishers, Second
Edition, 2012
2. Electric Machines –by I.J.Nagrath & D.P.Kothari, Tata Mc Graw Hill, 7th Edition.,2005
3. Electrical machines, PS Bimbra, Khanna Publishers.
REFERENCE BOOKS:
1. Performance and Design of AC Machines by MG.Say, BPB Publishers, 2002.
2. Theory of Alternating Current Machinery, by Langsdorf, Tata McGraw, Hill Companies,
       2nd edition, 2008
3. Electromechanics, II (transformers and induction motors) S. Kamakshaiah, Hitech
Publishers, 2005
4. Electric Machinery, A.E. Fitzgerald, C.Kingsley and S.Humans, Mcgraw Hill Companies,
6th edition, 2003