This textbook consists of Practicals in Thermal Engineering, I.C. Engines and Heat Transfer. Model Calculations have been provided for each experiment. Viva-voce questions with answers are also included in the last chapter to help students to understand the basic fundamentals of thermal engineering. The book will be helpful for B.E. Mechanical Engineering students as it cover for three semesters of the course. Allied branches like Production Engineering, Electrical Engineering, Information Technology and Polymer Science and Chemical Engineering also have thermal lab in their curriculum.