This is one of the subjects which students just pass during there semester exams and have no idea about its concept. This subject is easy when you have read it 5 times thoroughly, yes you need to study it again and again to understand its basics. Book by PK Nag is the most followed one, so doing solved question at the end of chapter will really help in grabbing the concepts although only basic question in the solved exercise need to be done. And previous years questions will help a lot. I would recommend NPTEL videos  when you want to understand a particular topic, videos by Prof SK Som from IIT Kgp are great you can click here to see on YouTube. His video on gas and vapour cycle are highly recommended.

Do I need to read book?

For those who are preparing on there own book is quite essential. Since in the notes there are many topics which are not explicitly explained so in order to understand the concept its necessary to have a reference  book. Please note that never ever use local author books which students use to pass university semester exams they will never help. Always follow standard textbooks.
Those who are in coaching institutes who don’t get much time to study from a book they may prefer not to but in case of important topics or confusions books are the best refuge.

Which book to refer?

Its always preferred to read book that you have already studied during your BTech. In case you didn’t read any ???? like most of the engineers.
Following are the books that i would recommend-


Book Name Links
Product Details Engineering Thermodynamics By PK Nag Flipkart


Product Details

Thermodynamics: An Engineering Approach By Yunus A Cengel


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