Hello Kasetty Chandrasekhar. Thanks for contacting Careers360 and we hope we will be able to answer your query. 

No, the qualifying exam hall ticket number is the hall ticket number of the last exam that you sat in the University.

But, many students are saying that they have not received their hall ticket number, so, I feel it is fine to just enter your B. Tech Roll Number provided by the University. 

Hope this helps you and all the best!