This comprehensive collection of problems contains questions from energy and thermal engineering practice as well as from existing exercises and examinations. The solutions are very detailed and therefore comprehensible. Since the structure of the book is based on that of the textbook "Fundamentals of Technical Thermodynamics", students can work through the contents in depth and check their learning success. In the present 2nd edition, extensions and additions have been made for a better understanding of the solution paths. Numerous checkboxes and exercises with solutions have been added. In addition, the extended introduction deals with the nature of entropy and draws attention to the benefits of thermodynamics.