This Chemical Engineering book has been prepared for candidates appearing in GATE 2023. This comprehensive volume covers the questions of the GATE of the last 23 years (2000 to 2022). For easy understanding and to provide in-depth explanations, all questions have been divided in ten subjects and each subject is again divided in topics, so that aspirants can adopt systemic approach of the study. Subjects are prepared according to the syllabus of the GATE which are thermodynamics, fluid mechanics, heat and mass transfer, chemical technology, instrumentation, mechanical operations, plant design and economics, etc. The book also contains a weightage analysis of previous year’s GATE papers.