Thermal Science and Engineering by Dr. D.S. Kumar is a cornerstone textbook widely utilized by mechanical engineering students for its comprehensive approach to thermodynamics and heat power systems
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Both are similar in syllabus coverage. D.S. Kumar is generally considered better for steam boilers and IC engines (more diagrams). R.K. Rajput is slightly better for thermodynamic cycles (Carnot, Rankine). For a "verified" PDF, both are good, but Kumar’s language is simpler for Hindi-medium background students. Thermal Science and Engineering by Dr