Electrical Machine-I

Syllabus

Unit_1: DC Generator

1.1.Constructional feature and types of D.C. Machines,
1.2. Types of armature winding,
1.3. Action of commutator,
1.4. Principle of D.C. generator,
1.5. Induced EMF,
1.6. Armature reaction,
1.7. Commutation,
1.8. Compensating Winding and Inter Poles,
1.9. External and internal Characteristics of D.C. Generator,
1.10. Critical Resistance,
1.11. Critical Speed.

Unit_2: DC Motor

2.1. Principle of D.C. Motors,
2.2. Back EMF,
2.3. Torque and Speed of D.C. Motors,
2.4. Losses and Efficiency,
2.5. Characteristics,
2.6. Starting and Speed Control of Various types of D.C. Motors.

Unit_3: Single Phase Transformer

3.1. Basic Principle,
3.2. Types and Construction of single phase transformer,
3.3. EMF equation,
3.4. Equivalent Circuits,
3.5. Phasor Diagram,
3.6. Losses and efficiency Testing,
3.7. Voltage Regulation,
3.8. per unit system,
3.9. Losses and Efficiency,
3.10. Parallel Operation of Single Phase Transformer.

Unit_4: Auto Transformer

4.1. Working Principle,
4.2. Efficiency,
4.3. Saving of Conductor,
4.4. Advantages and Disadvantages of Auto Transformer.

Unit_5: Three Phase Transformer

5.1. Introduction,
5.2. Types,
5.3. Phasor Group,
5.4. Parallel Operation of three Phase Transformers,
5.5. Cooling of Transformer.

Unit_6: Three Phase Induction Motors

6.1. Construction,
6.2. Types and principle of operation of three phase induction motors,
6.3. Production of rotating field,
6.4. Slip,
6.5. Equivalent Circuit and Phasor Diagram,
6.6. Mechanical Power Developed,
6.7. Maximum Torque,
6.8. Torque-Slip Characteristics,
6.9. Losses and Efficiency.
6.10. Starting,
6.11. Testing and Speed Control of Induction Motor.