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Electrical Machines

Electrical machines subject is the heart of Electrical engineering. electrical machinery conducts an exhaustive coverage of transformers, d.c. Machines and 3-phase synchronous and induction machines. it highlights the fact that all electrical machines function on similar fundamental doctrines. Average weightage of this subject in GATE examination is 08 to 10 percentage.

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About Electrical Machines

Electrical machines subject is the heart of Electrical engineering. electrical machinery conducts an exhaustive coverage of transformers, d.c. Machines and 3-phase synchronous and induction machines. it highlights the fact that all electrical machines function on similar fundamental doctrines.


It opens up with Basics of Network and Power system. Chapters like Objectives of transmission lines,Power flow equation and Power factor compensation method are divided in individual video lectures, covering each topic step wise.


Average weightage of this subject in GATE examination is 8 to 10%

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Syllabus

Chapter 1

Basic Concepts of Magnetic Circuits

  • 1.1 Ohm's Law in Electrical Circuits
  • 1.2 Ohm's Law in Magnetic Circuits
  • 1.3 Types of Magnetic Materials
  • 1.4 Basic Concepts of Magnetic Circuits - Numerical Problems

4 videos

Electrical Machine - 1.1 Ohm's Law in Electrical Circuits

Electrical Machine - 1.2 Ohm's Law in Magnetic Circuits

Electrical Machine - 1.3 Types of Magnetic Materials

Electrical Machine - 1.4 Basic Concepts of Magnetic Circuits : Numerical Questions

Chapter 2

Transformers

2.1 Introduction 

2.2 Transformer Construction 

2.3 Principle of Transformer Action 

2.4 Equivalent Circuit of A Transformer 

2.5 Open – Circuited and Short – Circuit Tests 

2.6 Voltage Regulation of A Transformer 

2.7 Transformer Losses 

2.8 Transformer Efficiency 

2.9 Transformers Tests 

2.10 Auto-Transformers 

2.11 Three Phase Transformer 

2.12 Gate Questions

Chapter 3

Basic Concept of Rotating Machines

3.1 - Introduction

3.2 - Flux Density Waveform & Induced EMF Equation

3.3 - Three Phase Machine & Distributed Winding and Short Pitch

3.4 - Numerical Questions

3.5 - Slot Harmonics

Chapter 4

D.C. Machine

Chapter 4

Chapter 5

Three Phase Induction Motor

Concept of Rotating Magnetic Field & Principle of Operation

Equivalent Circuit & Power flow

Torque Slip Characteristics

Stable & Unstable Region of Operation

No load Test & Blocked Rotor Test

Starting of Three Phase Induction Motor

Speed Control Of Three Phase Induction Motor

Logging & Crow ling

Single Phase Induction Motor

8 videos

5.1 Three Phase Induction Motor (Electrical Machine)

5.2 Three Phase Induction Motor (Electrical Machine)

5.3 Three Phase Induction Motor (Electrical Machine)

5.4 Three Phase Induction Motor (Electrical Machine)

5.5 Three Phase Induction Motor (Electrical Machine)

5.6 Three Phase Induction Motor (Electrical Machine)

5.8 Three Phase Induction Motor (Electrical Machine)

Chapter 6

Synchronous Machines

Introduction 

Circuit Model of Synchronous Machine 

Characteristics of Synchronous Machine 

Short-Circuit Ratio (SCR) 

Potier Method 

Operating Characteristics 

Power Flow (Transfer) Equations 

Capability Curve of Synchronous Generator 

Salient-Pole Synchronous Machine Two-Reaction Model 

Power-Angle Characteristic 

Determination of Xd And Xq –Slip Test 

Parallel Operation of Synchronous Generators 

Hunting in Synchronous Machines 

Damper Winding 

Special Machines Gate Questions 

4 videos

(Electrical Machine) 6.1 Synchronous Machines Part-1

(Electrical Machine) 6.2 Synchronous Machines Part-2

(Electrical Machine) 6.3 Synchronous Machines Part-3

(Electrical Machine) 6.4 Synchronous Machines Part-4

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