Contents Machines
THE GATE ACADEMY PVT.LTD. H.O.: #74, KeshavaKrupa (third Floor),
30th Cross, 10th Main, Jayanagar 4th Block, Bangalore-11 :
080-65700750, [email protected] Copyright reserved. Web:
www.thegateacademy.com Page i
C O N T E N T S
Chapter Page No #1. Transformer 1 52
Introduction 1 2 Types of Transformer 2 3 Principle of Operation
3 - 5 Equivalent Circuit 5 - 9 Voltage Regulation of Transformer 9
11 Testing of Transfromer 11 14 All-Day Effeciency of a Transfromer
14 Parallel Operation of Transformers 14 15 Three Phase
Transformation 15 25 Auto-Transformers 25 29 Tertiary windings 29
31 Assignment 1 32 37 Assignment 2 38 41 Answer Keys 42
Explanations 42 52
#2. Induction Motors 53 86
Introduction 53 55 Rotor Current 55 56 Torque of an Induction
Motor 56 61 Cascade Connection 61 64 Starting of Induction Motors
64 - 71 Assignment 1 72 76 Assignment 2 77 78 Answer Keys 79
Explanations 79 86
#3. D.C. Machine 87 124
Introduction 87 89 Performance Equations of D.C Generators 89 91
Armature Reaction in D.C Generators 92 93 D.C. Motors 93 95 Testing
of D.C Motors 95 98 Ward-Leonard Method 98 99 Armature Windings 99
111 Assignment 1 112 116 Assignment 2 116 117 Answer Keys 118
Explanations 118 - 124
http://www.thegateacademy.com/
Contents Machines
THE GATE ACADEMY PVT.LTD. H.O.: #74, KeshavaKrupa (third Floor),
30th Cross, 10th Main, Jayanagar 4th Block, Bangalore-11 :
080-65700750, [email protected] Copyright reserved. Web:
www.thegateacademy.com Page ii
#4. Synchronous Machine 125 163
Alternators 125 127 Generator Circle Diagrams 128 130
Synchronizing Power and Synchronizing Torque 130 132 MW-Frequency
and MVAR-Voltage Characteristics 132 133 Brushless Excitation
System 133 135 Design of Fractional Slot Winding 135 136 Regulation
of an Alternator 137 138 Methods of Determining Voltage Regulation
138 146 Assignment 1 147 151 Assignment 2 151 153 Answer Keys 154
Explanations 154 163
#5. Principles of Electro Mechincal Enegry Conversion 164
197
Principle of Energy Conversion 164 167 Electrical Energy Input
167 168 Magnetic Field Eergy Stored 168 173 Transient Energy of
Armature 174 Calculation of Mechanical Force 174 179 Doubly Excited
Magnetic Systems 180 185 Assignment 186 193 Answer Keys 194
Explanations 194 197
#6. Special Machines 198 220
Servomotors 198 200 Stepper Motors 200 208 Torque-Pulse Rate
Characteristics 208 210 Assignment 211 216 Answer Keys 217
Explanations 217 220
# Module Test 221 236
Test Questions 221 229 Answer Keys 230 Explanations 230 236
# Reference Books 237
http://www.thegateacademy.com/
