# Book Review: Electrical Machinery by Dr. P.S. Bimbhra

This post is to serve as a review for the book titled “Electrical Machinery” by Dr. P.S. Bimbhra. He has written many books related to Electrical Engineering such as books on Electrical Machines and Power Electronics and I must say he is a skilled writer. Now coming to the point what I felt about the book Electrical Machinery in general.

This is a good book for beginners who are taking their first course in Electrical Machines as well as those who are targeting competitive exams which have Electrical Machines in their curriculum. This book (“Electrical Machinery” by Dr. P.S. Bimbhra.) is quite vast having over 1000 pages due to which it may seem an uphill task to go through this book at once. The language used in the book is pretty simple to understand and all concepts have been explained from the very basics. The student needs to have a basic idea about the principles of Electromagnetic Theory before starting with the Machines course because such concepts have not been explained in this book.

This book covers the following chapters,

- Transformers
- Electromechanical Energy Conversion Principles
- Basic Concepts of Rotating Electrical Machines
- DC Machines
- Polyphase Synchronous Machines
- Polyphase Induction Motors
- Armature Windings

Also, there is appendix included at the end which cover Magnetic Circuits and Three-Phase Circuits. You can go through this appendix first in order to understand these concepts. These concepts form the backbone of Electrical Machines and the terms commonly used in this subject are explained here. Even the exercises are given at the end of these topics and you can practice these problems to get acquainted with the concepts explained.

I will now be dealing with the specific points about this book,

**Print Quality: **The printing quality is quite low and the font size is very small and that is why sometimes it may be straining to the eyes to read. Since the font size is small a lot of content is covered in this book even with 1000 pages.

**Detailing: **This book (“Electrical Machinery” by Dr. P.S. Bimbhra.) explains all the concepts in detail but I feel sometimes when basics of Electromagnetism is involved, it directly shows the result without explaining why such a thing is happening. Like when it shows armature mmf waveform it does not explain how it has been derived from the Ampere’s Law. The second thing that I feel is missing is the explanation of Constructional details of different machines. Though it explains the basic construction and working of different machines but it does not explain why a certain part has been designed in a particular fashion. But from GATE and ESE point of view, the concepts have been explained in sufficient details.

**Examples: **The solved examples given in the book at various points are good enough to cater the needs of university students as well as students preparing for competitive exams such as GATE, ESE and Civil Services. There is a sufficient number of examples that can provide you with conceptual clarity. The solved examples can also help you in conventional or subjective exams where you have to write the entire descriptive answer.

**Exercises: **The exercises given at the end of each chapter are up to the mark and can easily help GATE/ESE Aspirant. Also, there is a sufficient number of problems given with each chapter that a student may not require any other book for practice. At the end of the book, there are small conceptual objective problems which can help in some objective exams such as ESE Prelims.

Now, I will discuss some of the drawbacks of this book,

- There are a lot of concepts in this book which makes reading the entire book a tedious process.
- You cannot identify which topics are relevant for a particular exam so you need a guide with yourself.
- There are certain topics missing such as Three Phase Transformers, Speed Control and Braking of Induction Motor, Single Phase Induction Motor and Parallel Operation of alternators but these concepts are covered in “Generalized Theory of Electrical Machines” by Dr. P.S. Bimbhra.
- Sometimes the text can be a little bit difficult to understand as it becomes a bit too technical so if you have studied machines before or you have a faculty with you then you can understand.
- There is no mention of the important concepts that a student should remember so you have to figure that out yourself.
- The reading can be monotonous as the text presentation is a bit boring so you can get fed up easily and hence you need the perseverance to read this book.

**Overall Experience**

I would say that this book is very good for clearing the concepts of Electrical Machines but only if you are serious enough to put in the hard work. There may be times when you will be unable to grasp a concept and in those times you will need the help of an expert. Each and every line written in the book is informative and a small theory problem can be framed from any topic. So I would recommend that you should first go through Electrical Machines classes or videos and then you will be able to best understand this book. The concepts learned here will also help you during the interviews in core companies.