The physical book is massive—often exceeding 1,100 pages. Carrying it daily is a workout. A PDF on a smartphone or tablet allows engineers to study during commutes or lunch breaks.

This book is a popular textbook for Mechanical Engineering students, covering a wide range of topics in the field. The author, R.K. Jain, is a well-known expert in Mechanical Engineering and has written several books on the subject.

The second half of the PDF contains thousands of multiple-choice questions. Set a timer for 60 seconds per question. Because the PDF allows scrolling, hide the answers with a piece of paper on your monitor to test yourself honestly.