Hello aspirant!

As you mentioned that you want to know about the important books for the preparation of GATE and ESE.

A list of books below may give you a fair idea for GATE preparation related books.

Book Name

• Application and Concept in Agricultural Engineering by Dash & Mohanty
• Numerical Approach in Agricultural Engineeringby Er. Sanjay Kumar
• Gate Digest in Agricultural Engineering by Er. Sanjay Kumar
• Heat Transfer by J.P. Holman
• Transport Processes and Unit Operation by C.J. Geankoplis
• Fundamentals of Food Process Engineering by R.T. Toledo
• Introduction to Food Process Engineering by P. G. Smith
• Postharvest Technology and Food Process Engineering by Amalendu Chakraverty, R. Paul Singh, CRC Press (2014).
• Tractors and their Power Units by John B. Liljedahl, Paul K. Turnquist, David W. Smith, Makoto Hoki (4 author's book)-Springer US (1989).
• Engiineering Principle of Agricultural MachinesAjit K. Srivastava
• Elements of Agricultural Engineering byJ. Sahay

Hope this helps