Electrical Machines I
- Lecture Notes, Study Materials and Important questions answers

Subject : Electrical Machines I

MAGNETIC CIRCUITS AND MAGNETIC MATERIALS

1. Magnetic Circuits and Magnetic Materials - Answer (click here)
2. Laws Governing Magnetic Circuits - Answer (click here)
3. Flux Linkage, Inductance and Energy - Answer (click here)
4. Statically and Dynamically Induced Emf - Answer (click here)
5. Properties of Magnetic Materials - Answer (click here)
6. Iron or Core losses - Answer (click here)
7. AC Operation of Magnetic Circuits - Answer (click here)
8. Transformer as a Magnetically Coupled Circuit - Answer (click here)
9. Solved problems - Magnetic Circuits and Magnetic Materials - Answer (click here)
10. Important Short Questions and Answers : Electrical machines - Magnetic Circuits and Magnetic Materials - Answer (click here)

TRANSFORMERS

1. Transformer: Principle of Operation - Answer (click here)
2. An ideal Transformer: Principle of Operation - Answer (click here)
3. Induction Law - Transformer - Answer (click here)
4. Equivalent Circuit of Transformer - Answer (click here)
5. Transformer Losses - Answer (click here)
6. Transformer Tests - Answer (click here)
7. Efficiency of a Transformer - Answer (click here)
8. Voltage Regulation of Transformer - Answer (click here)
9. Auto Transformer - Answer (click here)
10. Three-phase autotransformer connection - Answer (click here)
11. Parallel Operation of Transformers - Answer (click here)
12. Tap Changing in Transformer - Answer (click here)
13. Solved Problems - Transformer - Electrical machines - Answer (click here)
14. Important Short Questions and Answers: Electrical machines - Transformer - Answer (click here)

ELECTROMECHANICAL ENERGY CONVERSION AND CONCEPTS IN ROTATING MACHINES

1. Energy In Magnetic Systems - Answer (click here)
2. The Field Energy - Answer (click here)
3. The Co Energy - Answer (click here)
4. Force In A Singly Excited Magnetic Field System - Answer (click here)
5. Force in a Multiply Excited Magnetic Field System - Answer (click here)
6. Mmf of Distributed Windings - Answer (click here)
7. Magnetic Fields In Rotating Machines - Answer (click here)
8. Rotating Mmf Waves - Answer (click here)
9. Torque in Ac And Dc Machines - Answer (click here)
10. Solved Problems - Electromechanical Energy Conversion and Concepts in Rotating Machines - Answer (click here)
11. Important Short Questions and Answers - Electromechanical Energy Conversion and Concepts in Rotating Machines - Answer (click here)

DC GENERATORS

1. Construction of DC Machines - Answer (click here)
2. Lap Winding - Answer (click here)
3. Wave Winding - Answer (click here)
4. EMF Equation of DC Generators - Answer (click here)
5. Armature reaction - Answer (click here)
6. Methods of excitation of the field windings - Answer (click here)
7. Methods of Excitation used for DC Generator - Answer (click here)
8. Commutation and Interpoles - Answer (click here)
9. DC Generator Characteristics - Answer (click here)
10. Important short questions and answers: DC Generators - Answer (click here)

DC MOTORS

1. Principle of operation of a D.C. Motor - Answer (click here)
2. Working of D.C. Motor - Answer (click here)
3. Types of DC Motors - Answer (click here)
4. DC Motor Characteristics - Answer (click here)
5. Speed Control of DC Shunt Motor: Varying Armature Resistance, Field Resistance - Answer (click here)
6. Starting of DC Motors - Answer (click here)
7. Three Point Starter: Working principle - Answer (click here)
8. Four Point Starter - Answer (click here)
9. Swinburne’s Test - Answer (click here)
10. Hopkinson’s test: Procedure, Calculation of efficiency, Advantages, Disadvantages - Answer (click here)
11. Braking of DC shunt motor - Answer (click here)
12. Important Short questions and answers: DC Motor - Electrical machines - Answer (click here)