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Electrical Engineering Topics

CONTENTS

1.D.C. NETWORKS

1. Current Electricity-Basic Concepts

2. Definitions of Important Tenns Relating Network

3. Limitations of Ohm’s Law

4. Kirchhoff ‘s Laws

5. Applications of Kirchhoff’s Laws

6. Source Conversion

7. Solving Equations by Determinants-Cramer’s Rule

8. Superposition Theorem

9. Thevenin’s  Theorem

10 .Norton’s Theorem

11. Maximum Power Transfer Theorem

12. Delta Star Transformation

13. Compensation Theorem

14. Reciprocity Theorem

15. Millman’s Theorem

D.C. NETWORKS Examples

 

2. SINGLE PHASE A.C. CIRCUITS

1. Introduction to Alternating Current

2. Generation and Equations of Alternating Voltages and Currents

3. Alternating Voltage and Current

4. Single Phase Circuits

5.  Transients

Transients Examples

 

3. THREE-PHASE A.C. CIRCUITS

1. Introduction

2. Advantages of Polyphase Systems

3. Generation of Three-phase Voltages

4. Phase Sequence and Numbering of Phases

5. Inter-connection of Three Phases

6. Star or Wye (Y) Connection

7. Delta (6) or Mesh Connection

8. Comparison between Star and Delta Systems

9. Measurement of Power in 3-phase circuit

10. Measurement of Reactive Volt Amperes

11. Unbalanced Star-connected Load

11.1. Three-phase four-wire system

11.2. Three-phase three-wire system

12. Unbalanced Delta-connected Load

13. Power Factor Improvement

Highlights

Objective Type Questions

Theoretical Questions

Unsolved Examples

 

4. ELECTROMAGNETISM

1. Magnetic Field

2. Terms Connected with Magnetic Materials

3. Classification of Magnetic Materials

4. Magnetically Soft Materials

5. Magnetically Hard Materials

6. Laws of Magnetic Force

7. Magnetic Field Due to a Current Carrying Conductor

8. Magnetic Flux and Flux Density

9. Magnetomotive Force and Magnetic Field Strength

10. Force on a Current-Carrying Conductor Lying in a Magnetic Field

11. Magnetising Force of a Long Straight Conductor

12. Magnetising Force of a Long Solenoid

13. Force between Two Parallel Conductors-Ampere’s Law

14. Terms Connected with Magnetic Circuit

15. Comparison of Electric and Magnetic Circuits

16. Magnetic Leakage and Fringing

17 Magnetisation (B-H) Curves

18. Losses in Magnetic Materials

19. Faraday’s Laws of Electromagnetic Induction

20. Induced E.M.F

21. Inductances in Series

22. Inductances in Parallel

Highlights

Objective Type Questions

Theoretical Questions

Unsolved Examples

 

5. TRANSFORMERS

1. General Aspects

2. Basic Definitions.

3. Working Principle of a Transformer.

4. Transformer Ratings

5. Kinds of Transformers

6. Transformer Construction

7. Transformer Windings, Terminals, Tappings and Bushings.

8. Transformer Cooling

9. Single-phase Transformer

10. Three-phase Transformers

Highlights

Objective Type Questions

Theoretical Questions

Unsolved Examples

 

6. POLYPHASE INDUCTION MOTORS

1. General Aspects

2. Classification of A.C. Motors

3. Constructional Details

4. Production of Rotating Magnetic Field

5. Theory of Operation of an Induction Motor

6. Slip

7. Frequency of Rotor Current

8. Rotor E.M.F. and Rotor Current

9. Torque and Power

10. Effect of Change in Supply Voltage on Starting Torque

11. Effect of Change in Supply Voltage on Torque and Slip

12. Full-load Torque and Maximum Torque

13. Starting Torque and Maximum Torque

14. Torque-slip and Torque-speed Curves

15. Operating Characteristics of a 3-phase Squirrel-Cage Induction Motor

16. Operating Characteristics of a Wound-Rotor (slip-ring) Induction Motor

17. Power Stages in an Induction Motor

18. Induction Motor as Transtormer

19. Equivalent Circuit of an Induction Motor

20. Starting of Induction Motors

21. Factors Governing Performance of Induction Motors

22. Effects of Operating Conditions

23. Ratings of 3-phase Induction Motors

24. Squirrel-cage Motors- Advantages, Disadvantages and Applications

25. Wound Rotor (or Slip-ring) Induction Motors-Advantages, Disadvantages and Applications

26. Comparison of a Squirrel-cage and a Slip-ring (or Phase Wound) Induction Motor

27. Comparison between Induction and Synchronous Motors

Highlights

Objective Type Questions

Theoretical Questions

Unsolved Examples

 

7. SINGLE PHASE MOTORS

1. General Aspects

2. Types of Single-phase Motor

3. Single-phase Induction Motors

4. Split-phase Motors

5. Single-phase Commutator Motors

6. Single-phase Synchronous Motors

7. Stepper Motors

8. Servo-Motors

9. Tachometer Generators

Highlights

Objective Type Questions

Theoretical Questions

 

8. DIRECT CURRENT (D.C.) MACHINES

1. Construction of D.C. Machines

2. E.m.f. Equation of a Generator

3. Types of D.C. Generators

4. Power Division in a D.C. Generator

5. Characteristics of D.C. Generatorg

6. Applications of D.C. Generators

7. Direct Current Motor

8. Speed Control of D.C. Motors

9. Losses and Efficiency of D.C. Machines

Highlights

Objective Type Questions

Theoretical Questions

Unsolved Examples

 

9. MEASURING INSTRUMENTS

1. Introduction and Classification

2. Electrical Principles of Operation

3. Electrical Indicating Instruments

4. Moving-Iron Instruments (Ammeters and Voltmeters)

5. Moving-Coil Instruments

6. Rectifier Instruments

7. Wattmeters

8. Integrating Meters (Energy Meters)

9. Measurement of Resistance

10. The Potentiometer

11. Megger

12. Instrument Transformers

Highlights

Theoretical Questions

Unsolved Example

 

10. POWER SUPPLY SYSTEM

1. Sources of Energy

2. Power Plants

3. Transmission and Distribution

4. Power Factor Improvement

Highlights

Objective Type Questions

Theoretical Questions