For Diploma in Engineering (CTEVT) and Bachelor’s of Engineering (B.E.) in Electronics and Communication, Electrical and Computer Engineering

Preface to Third Edition 

I am extremely happy in presenting third edition of the book. I am highly satisfied by the warm reception of the first and second editions by the students, readers and experts. I have been trying my best to keep the book error free and up to date.

Any misprints, errors and suggestions brought to my notice for the further improvement of the book will be gratefully acknowledged and will be incorporated in the next edition.

April 2022                                                                                                                                                Er. Bikal Adhikari

Imadol, Lalitpur, Nepal