Currently the stage – I (Prelims) of ESE (mechanical engineering) consists of two objective papers. Paper –I is for general studies & Engineering Aptitude, while paper-II is of Mechanical engineering for 300 marks and 3 hours duration. In stage-II (Mains) Mechanical engineering, the technical syllabus is divided into two papers which contain conventional Questions. The objective questions included in this volume are the following subjects only. 1.Thermal Engineering2. Heat Transfer 3. Fluid Mechanics4.Turbo Machinery Based on the new pattern for prelims, Volume - I is redesigned using the previous question from 1992 onwards for the above mentioned subjects. The style, quality and content of the solutions for previous ESE questions of mechanical engineering, will encourage the reader, especially the student whether above average, average or below average to learn the concept and answer the question in the subject without any tension, However, It is the reader who should confirm this and any comments and suggestions regarding this would be warmly received by the Academy. It is observed that majority of ESE objective Question are being asked as it is, in many PSU’s , state service commissions , state electricity boards and even in GATE Exam. Hence, we strongly recommend all students who are competing for various competitive exams to use this book according to the syllabus of the exam concerned. This book can also be used by fresh teachers in engineering colleges to improve their concepts We proudly say that questions and solutions right from 1992 onwards are given in this book. The questions which appeared in early 90’s are most conceptual oriented and these are being repeated in the recent exams in a different way. Hence, we advise the students to practice these questions compulsorily.