Read R. K. Bansal for Fluid Mechanics or R. S. Khurmi for TOM first. When you finish a chapter, open the R. K. Jain PDF to solve the "Objective Questions" at the end of that chapter. This reinforces learning.

Many free versions circulating online have technical flaws. Be aware:

RK Jain has authored several books on Mechanical Engineering, including:

If you were looking for a specific technical report within the field of mechanical engineering (often grouped with this textbook in digital libraries), common topics include: