The new edition of GATE 2023 Instrumentation Engineering incorporates solved papers of the last 31 years. The book is fully revised, updated, and edited. It has been divided into topic-wise sections. Solutions are written in a lucid and step-by-step manner so that a fresher student can also understand. At the beginning of each subject, an analysis of previous papers is given to improve the understanding of the subject. The book is not only useful for GATE aspirants but also very fruitful for those who are aiming for PSUs & other such competitive examinations.