Electrical Machines Questions & Answers
1. Magnetic Circuits
2. Basic Concepts in Rotating Machines

Reluctance Motor

Doubly Excited Magnetic Systems

Elementary Synchronous Machines

Singly Excited Electric Field Systems

Torque Production and Dynamic Equations

Terms Pertaining to Rotating Machines

Rotating Magnetic Field – 1

Rotating Magnetic Field – 2
3. Constructional Features of Rotating Electrical Machines

Features of Rotating Electrical Machines1

Features of Rotating Electrical Machines2

Features of Rotating Electrical Machines3
4. Principles of Electro mechanical Energy Conversions
5. Rating and Loss Dissipation
6. Electrical Machine Applications/ Armature Reaction and Commutation
7. Electromechanical Energy Conversions
8. DC Machines

Circuit Model of DC Machines

Methods of Excitation

MMF and Flux Density Waveforms in DC Machines

Effect of Brush Shift and Compensation Windings

Efficiency and Testing of DC Machines

DC Machine Applications
9. DC Generators
10. DC Motors

Operating Characteristics of DC Motors

DC Motor Starting

Speed Control of DC Motors

Permanent Magnet DC (PMDC) Motors
11. Synchronous Machines

EMF Polygon – 1

EMF Polygon – 2

Production of Torque in NonSalient Pole Machines

MMF Produced by Distributed Windings

Excitation Systems for Synchronous Machines

Flux and MMF Phasors in Synchronous Machines

Physical Concepts of Synchronous Machine Operation

Power Factor Control of Synchronous Machines

Two Reaction Theory of Salient Pole Machines

Power Angle Characteristics of Synchronous Machines

Measurement of Xd and Xq

Synchronous Machine Applications
12. Synchronous Generators

Phasor Diagram of a Cylindrical Rotor Alternator

Voltage Regulation of an Alternator

Operating Characteristics of Alternators and their Ratings
13. Synchronous Motors

Synchronous Motor Phasor Diagram

Power Factor Correction by Synchronous Motors

Starting of Synchronous Motors
14. Efficiency and Regulation

Power Flow Through an Inductive Impedance – I

Power Flow Through an Inductive Impedance – II

Efficiency of Synchronous Machines

Losses and Efficiency
15. Synchronous Machine Stability

Synchronizing Power and Synchronizing Torque

Synchronous Machine Stability

Hunting and Damper Windings
16. Induction Machines

Induction Motor as a Transformer

Principle of Operation

Flux and MMF Phasors and Waves in Induction Motors

Rotor Frequency

Rotor EMF, Current and Power

Induction Motor Phasor Diagram

Equivalent Circuit

Analysis of the Equivalent Circuit

Operating Characteristics of Induction Motors

Determination of Equivalent Circuit Parameters

Power Factor Control of Three Phase Induction Motors

Induction Generator

Applications of Polyphase Induction Motors

Circle Diagrams of Induction Machines
17. Starting of Induction Motors
18. Armature Windings
19. Transformers

Transformer Construction

Ideal Two Winding Transformer

Transformer Phasor Diagram

Equivalent Circuit of Transformer

Open Circuit and Short Circuit Test

Voltage Regulation of Transformer

Transformer Losses and Efficiency

Parallel Operation of Single Phase Transformers

Transformer as a Magnetically Coupled Circuit

Three Phase Transformers

Autotransformers