JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• To know the basic principle of DC generators and motors.
• To know the basic principle of single phase transformers.
• To understand the basic principle of three-phase induction motor and alternators.
• To understand the basic principle of special motors and electrical instruments.

Course Outcome:

• To analyze the performance of dc generators and motors.
• To analyze the performance of transformers.
• To learn the in-depth knowledge on three phase induction motors.
• To analyze the performance of special motors and electrical instruments in real time applications.

UNIT - I

D.C Generators and DC Motors: Principle of operation of DC Machines- EMF equation – Types of generators – Magnetization and load characteristics of DC generators, DC Motors – Types of DC Motors – Characteristics of DC motors – 3-point starters for DC shunt motor – Losses and efficiency – Swinburne’s test – Speed control of DC shunt motor – Flux and Armature voltage control methods.

UNIT - II

Transformers & Performance: Principle of operation of single phase transformer – types – Constructional features – Phasor diagram on No Load and Load – Equivalent circuit, Losses and Efficiency of transformer and Regulation – OC and SC tests – Predetermination of efficiency and regulation (Simple Problems).

UNIT - III

Three Phase Induction Motor: Principle of operation of three-phase induction motors –Slip ring and Squirrel cage motors – Slip-Torque characteristics – Efficiency calculation – Starting methods.

UNIT - IV

Alternators: Alternators – Constructional features – Principle of operation – Types - EMF Equation – Distribution and Coil span factors – Predetermination of regulation by Synchronous Impedance Method – OC and SC tests.

UNIT - V

Special Motors & Electrical Instruments : Principle of operation - Shaded pole motors – Capacitor motors, AC servomotor, AC tachometers, Synchros, Stepper Motors –

Characteristics, Basic Principles of indicating instruments – Moving Coil and Moving iron Instruments (Ammeters and Voltmeters).

TEXT BOOKS:

• 1. Introduction to Electrical Engineering – M.S Naidu and S. Kamakshaiah, TMH Publ.
• 2. Basic Electrical Engineering - T.K. Nagasarkar and M. S. Sukhija, Oxford University Press, 2005

REFERENCES:

• 1. Principles of Electrical Engineering - V.K Mehta, S. Chand Publications.
• 2. Theory and Problems of basic electrical engineering - I.J. Nagarath and D.P Kothari, PHI Publications
• 3. Essentials of Electrical and Computer Engineering - David V. Kerns, JR. J. David Irwin